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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/bit-vec-0.6.3/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../bit_vec/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../bit_vec/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="comment">// Copyright 2012-2020 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
 // &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 // FIXME(Gankro): BitVec and BitSet are very tightly coupled. Ideally (for
 // maintenance), they should be in separate files/modules, with BitSet only
 // using BitVec&#39;s public API. This will be hard for performance though, because
 // `BitVec` will not want to leak its internal representation while its internal
 // representation as `u32`s must be assumed for best performance.

 // (1) Be careful, most things can overflow here because the amount of bits in
 //     memory can overflow `usize`.
 // (2) Make sure that the underlying vector has no excess length:
 //     E. g. `nbits == 16`, `storage.len() == 2` would be excess length,
 //     because the last word isn&#39;t used at all. This is important because some
 //     methods rely on it (for *CORRECTNESS*).
 // (3) Make sure that the unused bits in the last word are zeroed out, again
 //     other methods rely on it for *CORRECTNESS*.
 // (4) `BitSet` is tightly coupled with `BitVec`, so any changes you make in
 // `BitVec` will need to be reflected in `BitSet`.

 </span><span class="doccomment">//! Collections implemented with bit vectors.
 //!
 //! # Examples
 //!
 //! This is a simple example of the [Sieve of Eratosthenes][sieve]
 //! which calculates prime numbers up to a given limit.
 //!
 //! [sieve]: http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
 //!
 //! ```
 //! use bit_vec::BitVec;
 //!
 //! let max_prime = 10000;
 //!
 //! // Store the primes as a BitVec
 //! let primes = {
 //!     // Assume all numbers are prime to begin, and then we
 //!     // cross off non-primes progressively
 //!     let mut bv = BitVec::from_elem(max_prime, true);
 //!
 //!     // Neither 0 nor 1 are prime
 //!     bv.set(0, false);
 //!     bv.set(1, false);
 //!
 //!     for i in 2.. 1 + (max_prime as f64).sqrt() as usize {
 //!         // if i is a prime
 //!         if bv[i] {
 //!             // Mark all multiples of i as non-prime (any multiples below i * i
 //!             // will have been marked as non-prime previously)
 //!             for j in i.. {
 //!                 if i * j &gt;= max_prime {
 //!                     break;
 //!                 }
 //!                 bv.set(i * j, false)
 //!             }
 //!         }
 //!     }
 //!     bv
 //! };
 //!
 //! // Simple primality tests below our max bound
 //! let print_primes = 20;
 //! print!(&quot;The primes below {} are: &quot;, print_primes);
 //! for x in 0..print_primes {
 //!     if primes.get(x).unwrap_or(false) {
 //!         print!(&quot;{} &quot;, x);
 //!     }
 //! }
 //! println!();
 //!
 //! let num_primes = primes.iter().filter(|x| *x).count();
 //! println!(&quot;There are {} primes below {}&quot;, num_primes, max_prime);
 //! assert_eq!(num_primes, 1_229);
 //! ```

 </span><span class="attribute">#![doc(html_root_url = <span class="string">&quot;https://docs.rs/bit-vec/0.6.3&quot;</span>)]

 #![no_std]

 #[cfg(any(test, feature = <span class="string">&quot;std&quot;</span>))]
 #[macro_use]
 </span><span class="kw">extern crate </span>std;
 <span class="attribute">#[cfg(feature=<span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">use </span>std::vec::Vec;

 <span class="attribute">#[cfg(feature=<span class="string">&quot;serde&quot;</span>)]
 </span><span class="kw">extern crate </span>serde;
 <span class="attribute">#[cfg(feature=<span class="string">&quot;serde&quot;</span>)]
 </span><span class="kw">use </span>serde::{Serialize, Deserialize};

 <span class="attribute">#[cfg(not(feature=<span class="string">&quot;std&quot;</span>))]
 #[macro_use]
 </span><span class="kw">extern crate </span>alloc;
 <span class="attribute">#[cfg(not(feature=<span class="string">&quot;std&quot;</span>))]
 </span><span class="kw">use </span>alloc::vec::Vec;

 <span class="kw">use </span>core::cmp::Ordering;
 <span class="kw">use </span>core::cmp;
 <span class="kw">use </span>core::fmt;
 <span class="kw">use </span>core::hash;
 <span class="kw">use </span>core::mem;
 <span class="kw">use </span>core::iter::FromIterator;
 <span class="kw">use </span>core::slice;
 <span class="kw">use </span>core::{u8, usize};
 <span class="kw">use </span>core::iter::repeat;
 <span class="kw">use </span>core::ops::<span class="kw-2">*</span>;

 <span class="kw">type </span>MutBlocks&lt;<span class="lifetime">&#39;a</span>, B&gt; = slice::IterMut&lt;<span class="lifetime">&#39;a</span>, B&gt;;

 <span class="doccomment">/// Abstracts over a pile of bits (basically unsigned primitives)
 </span><span class="kw">pub trait </span>BitBlock:
 	Copy +
 	Add&lt;<span class="self">Self</span>, Output=<span class="self">Self</span>&gt; +
 	Sub&lt;<span class="self">Self</span>, Output=<span class="self">Self</span>&gt; +
 	Shl&lt;usize, Output=<span class="self">Self</span>&gt; +
 	Shr&lt;usize, Output=<span class="self">Self</span>&gt; +
 	Not&lt;Output=<span class="self">Self</span>&gt; +
 	BitAnd&lt;<span class="self">Self</span>, Output=<span class="self">Self</span>&gt; +
 	BitOr&lt;<span class="self">Self</span>, Output=<span class="self">Self</span>&gt; +
 	BitXor&lt;<span class="self">Self</span>, Output=<span class="self">Self</span>&gt; +
 	Rem&lt;<span class="self">Self</span>, Output=<span class="self">Self</span>&gt; +
 	Eq +
 	Ord +
 	hash::Hash
 {
 	<span class="doccomment">/// How many bits it has
     </span><span class="kw">fn </span>bits() -&gt; usize;
     <span class="doccomment">/// How many bytes it has
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>bytes() -&gt; usize { <span class="self">Self</span>::bits() / <span class="number">8 </span>}
     <span class="doccomment">/// Convert a byte into this type (lowest-order bits set)
     </span><span class="kw">fn </span>from_byte(byte: u8) -&gt; <span class="self">Self</span>;
     <span class="doccomment">/// Count the number of 1&#39;s in the bitwise repr
     </span><span class="kw">fn </span>count_ones(<span class="self">self</span>) -&gt; usize;
     <span class="doccomment">/// Get `0`
     </span><span class="kw">fn </span>zero() -&gt; <span class="self">Self</span>;
     <span class="doccomment">/// Get `1`
     </span><span class="kw">fn </span>one() -&gt; <span class="self">Self</span>;
 }

 <span class="macro">macro_rules! </span>bit_block_impl {
     ($((<span class="macro-nonterminal">$t</span>: ident, <span class="macro-nonterminal">$size</span>: expr)),<span class="kw-2">*</span>) =&gt; ($(
         <span class="kw">impl </span>BitBlock <span class="kw">for </span><span class="macro-nonterminal">$t </span>{
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>bits() -&gt; usize { <span class="macro-nonterminal">$size </span>}
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>from_byte(byte: u8) -&gt; <span class="self">Self </span>{ <span class="macro-nonterminal">$t::from</span>(byte) }
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>count_ones(<span class="self">self</span>) -&gt; usize { <span class="self">self</span>.count_ones() <span class="kw">as </span>usize }
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>one() -&gt; <span class="self">Self </span>{ <span class="number">1 </span>}
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>zero() -&gt; <span class="self">Self </span>{ <span class="number">0 </span>}
         }
     )<span class="kw-2">*</span>)
 }

 <span class="macro">bit_block_impl!</span>{
     (u8, <span class="number">8</span>),
     (u16, <span class="number">16</span>),
     (u32, <span class="number">32</span>),
     (u64, <span class="number">64</span>),
     (usize, core::mem::size_of::&lt;usize&gt;() * <span class="number">8</span>)
 }

 <span class="kw">fn </span>reverse_bits(byte: u8) -&gt; u8 {
     <span class="kw">let </span><span class="kw-2">mut </span>result = <span class="number">0</span>;
     <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..u8::bits() {
         result |= ((byte &gt;&gt; i) &amp; <span class="number">1</span>) &lt;&lt; (u8::bits() - <span class="number">1 </span>- i);
     }
     result
 }

 <span class="kw">static </span>TRUE: bool = <span class="bool-val">true</span>;
 <span class="kw">static </span>FALSE: bool = <span class="bool-val">false</span>;

 <span class="doccomment">/// The bitvector type.
 ///
 /// # Examples
 ///
 /// ```
 /// use bit_vec::BitVec;
 ///
 /// let mut bv = BitVec::from_elem(10, false);
 ///
 /// // insert all primes less than 10
 /// bv.set(2, true);
 /// bv.set(3, true);
 /// bv.set(5, true);
 /// bv.set(7, true);
 /// println!(&quot;{:?}&quot;, bv);
 /// println!(&quot;total bits set to true: {}&quot;, bv.iter().filter(|x| *x).count());
 ///
 /// // flip all values in bitvector, producing non-primes less than 10
 /// bv.negate();
 /// println!(&quot;{:?}&quot;, bv);
 /// println!(&quot;total bits set to true: {}&quot;, bv.iter().filter(|x| *x).count());
 ///
 /// // reset bitvector to empty
 /// bv.clear();
 /// println!(&quot;{:?}&quot;, bv);
 /// println!(&quot;total bits set to true: {}&quot;, bv.iter().filter(|x| *x).count());
 /// ```
 </span><span class="attribute">#[cfg_attr(feature=<span class="string">&quot;serde&quot;</span>, derive(Serialize, Deserialize))]
 </span><span class="kw">pub struct </span>BitVec&lt;B=u32&gt; {
     <span class="doccomment">/// Internal representation of the bit vector
     </span>storage: Vec&lt;B&gt;,
     <span class="doccomment">/// The number of valid bits in the internal representation
     </span>nbits: usize
 }

 <span class="comment">// FIXME(Gankro): NopeNopeNopeNopeNope (wait for IndexGet to be a thing)
 </span><span class="kw">impl</span>&lt;B: BitBlock&gt; Index&lt;usize&gt; <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="kw">type </span>Output = bool;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>index(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; <span class="kw-2">&amp;</span>bool {
         <span class="kw">if </span><span class="self">self</span>.get(i).expect(<span class="string">&quot;index out of bounds&quot;</span>) {
             <span class="kw-2">&amp;</span>TRUE
         } <span class="kw">else </span>{
             <span class="kw-2">&amp;</span>FALSE
         }
     }
 }

 <span class="doccomment">/// Computes how many blocks are needed to store that many bits
 </span><span class="kw">fn </span>blocks_for_bits&lt;B: BitBlock&gt;(bits: usize) -&gt; usize {
     <span class="comment">// If we want 17 bits, dividing by 32 will produce 0. So we add 1 to make sure we
     // reserve enough. But if we want exactly a multiple of 32, this will actually allocate
     // one too many. So we need to check if that&#39;s the case. We can do that by computing if
     // bitwise AND by `32 - 1` is 0. But LLVM should be able to optimize the semantically
     // superior modulo operator on a power of two to this.
     //
     // Note that we can technically avoid this branch with the expression
     // `(nbits + U32_BITS - 1) / 32::BITS`, but if nbits is almost usize::MAX this will overflow.
     </span><span class="kw">if </span>bits % B::bits() == <span class="number">0 </span>{
         bits / B::bits()
     } <span class="kw">else </span>{
         bits / B::bits() + <span class="number">1
     </span>}
 }

 <span class="doccomment">/// Computes the bitmask for the final word of the vector
 </span><span class="kw">fn </span>mask_for_bits&lt;B: BitBlock&gt;(bits: usize) -&gt; B {
     <span class="comment">// Note especially that a perfect multiple of U32_BITS should mask all 1s.
     </span>(!B::zero()) &gt;&gt; ((B::bits() - bits % B::bits()) % B::bits())
 }

 <span class="kw">type </span>B = u32;

 <span class="kw">impl </span>BitVec&lt;u32&gt; {

     <span class="doccomment">/// Creates an empty `BitVec`.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     /// let mut bv = BitVec::new();
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
         Default::default()
     }

     <span class="doccomment">/// Creates a `BitVec` that holds `nbits` elements, setting each element
     /// to `bit`.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(10, false);
     /// assert_eq!(bv.len(), 10);
     /// for x in bv.iter() {
     ///     assert_eq!(x, false);
     /// }
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>from_elem(nbits: usize, bit: bool) -&gt; <span class="self">Self </span>{
         <span class="kw">let </span>nblocks = blocks_for_bits::&lt;B&gt;(nbits);
         <span class="kw">let </span><span class="kw-2">mut </span>bit_vec = BitVec {
             storage: <span class="macro">vec!</span>[<span class="kw">if </span>bit { !B::zero() } <span class="kw">else </span>{ B::zero() }; nblocks],
             nbits,
         };
         bit_vec.fix_last_block();
         bit_vec
     }

     <span class="doccomment">/// Constructs a new, empty `BitVec` with the specified capacity.
     ///
     /// The bitvector will be able to hold at least `capacity` bits without
     /// reallocating. If `capacity` is 0, it will not allocate.
     ///
     /// It is important to note that this function does not specify the
     /// *length* of the returned bitvector, but only the *capacity*.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>with_capacity(nbits: usize) -&gt; <span class="self">Self </span>{
         BitVec {
             storage: Vec::with_capacity(blocks_for_bits::&lt;B&gt;(nbits)),
             nbits: <span class="number">0</span>,
         }
     }

     <span class="doccomment">/// Transforms a byte-vector into a `BitVec`. Each byte becomes eight bits,
     /// with the most significant bits of each byte coming first. Each
     /// bit becomes `true` if equal to 1 or `false` if equal to 0.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let bv = BitVec::from_bytes(&amp;[0b10100000, 0b00010010]);
     /// assert!(bv.eq_vec(&amp;[true, false, true, false,
     ///                     false, false, false, false,
     ///                     false, false, false, true,
     ///                     false, false, true, false]));
     /// ```
     </span><span class="kw">pub fn </span>from_bytes(bytes: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="self">Self </span>{
         <span class="kw">let </span>len = bytes.len().checked_mul(u8::bits()).expect(<span class="string">&quot;capacity overflow&quot;</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>bit_vec = BitVec::with_capacity(len);
         <span class="kw">let </span>complete_words = bytes.len() / B::bytes();
         <span class="kw">let </span>extra_bytes = bytes.len() % B::bytes();

         bit_vec.nbits = len;

         <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..complete_words {
             <span class="kw">let </span><span class="kw-2">mut </span>accumulator = B::zero();
             <span class="kw">for </span>idx <span class="kw">in </span><span class="number">0</span>..B::bytes() {
                 accumulator |=
                     B::from_byte(reverse_bits(bytes[i * B::bytes() + idx])) &lt;&lt; (idx * <span class="number">8</span>)
             }
             bit_vec.storage.push(accumulator);
         }

         <span class="kw">if </span>extra_bytes &gt; <span class="number">0 </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>last_word = B::zero();
             <span class="kw">for </span>(i, <span class="kw-2">&amp;</span>byte) <span class="kw">in </span>bytes[complete_words * B::bytes()..].iter().enumerate() {
                 last_word |=
                     B::from_byte(reverse_bits(byte)) &lt;&lt; (i * <span class="number">8</span>);
             }
             bit_vec.storage.push(last_word);
         }

         bit_vec
     }

     <span class="doccomment">/// Creates a `BitVec` of the specified length where the value at each index
     /// is `f(index)`.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let bv = BitVec::from_fn(5, |i| { i % 2 == 0 });
     /// assert!(bv.eq_vec(&amp;[true, false, true, false, true]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>from_fn&lt;F&gt;(len: usize, <span class="kw-2">mut </span>f: F) -&gt; <span class="self">Self
         </span><span class="kw">where </span>F: FnMut(usize) -&gt; bool
     {
         <span class="kw">let </span><span class="kw-2">mut </span>bit_vec = BitVec::from_elem(len, <span class="bool-val">false</span>);
         <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..len {
             bit_vec.set(i, f(i));
         }
         bit_vec
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; BitVec&lt;B&gt; {
     <span class="doccomment">/// Applies the given operation to the blocks of self and other, and sets
     /// self to be the result. This relies on the caller not to corrupt the
     /// last word.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>process&lt;F&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>BitVec&lt;B&gt;, <span class="kw-2">mut </span>op: F) -&gt; bool
     		<span class="kw">where </span>F: FnMut(B, B) -&gt; B {
         <span class="macro">assert_eq!</span>(<span class="self">self</span>.len(), other.len());
         <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.storage.len(), other.storage.len());
         <span class="kw">let </span><span class="kw-2">mut </span>changed_bits = B::zero();
         <span class="kw">for </span>(a, b) <span class="kw">in </span><span class="self">self</span>.blocks_mut().zip(other.blocks()) {
             <span class="kw">let </span>w = op(<span class="kw-2">*</span>a, b);
             changed_bits = changed_bits | (<span class="kw-2">*</span>a ^ w);
             <span class="kw-2">*</span>a = w;
         }
         changed_bits != B::zero()
     }

     <span class="doccomment">/// Iterator over mutable refs to  the underlying blocks of data.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>blocks_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; MutBlocks&lt;B&gt; {
         <span class="comment">// (2)
         </span><span class="self">self</span>.storage.iter_mut()
     }

     <span class="doccomment">/// Iterator over the underlying blocks of data
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>blocks(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Blocks&lt;B&gt; {
         <span class="comment">// (2)
         </span>Blocks{iter: <span class="self">self</span>.storage.iter()}
     }

     <span class="doccomment">/// Exposes the raw block storage of this BitVec
     ///
     /// Only really intended for BitSet.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>storage(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[B] {
     	<span class="kw-2">&amp;</span><span class="self">self</span>.storage
     }

     <span class="doccomment">/// Exposes the raw block storage of this BitVec
     ///
     /// Can probably cause unsafety. Only really intended for BitSet.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub unsafe fn </span>storage_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>Vec&lt;B&gt; {
     	<span class="kw-2">&amp;mut </span><span class="self">self</span>.storage
     }

     <span class="doccomment">/// Helper for procedures involving spare space in the last block.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>last_block_with_mask(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;(B, B)&gt; {
         <span class="kw">let </span>extra_bits = <span class="self">self</span>.len() % B::bits();
         <span class="kw">if </span>extra_bits &gt; <span class="number">0 </span>{
             <span class="kw">let </span>mask = (B::one() &lt;&lt; extra_bits) - B::one();
             <span class="kw">let </span>storage_len = <span class="self">self</span>.storage.len();
             <span class="prelude-val">Some</span>((<span class="self">self</span>.storage[storage_len - <span class="number">1</span>], mask))
         } <span class="kw">else </span>{
             <span class="prelude-val">None
         </span>}
     }

     <span class="doccomment">/// Helper for procedures involving spare space in the last block.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>last_block_mut_with_mask(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;(<span class="kw-2">&amp;mut </span>B, B)&gt; {
         <span class="kw">let </span>extra_bits = <span class="self">self</span>.len() % B::bits();
         <span class="kw">if </span>extra_bits &gt; <span class="number">0 </span>{
             <span class="kw">let </span>mask = (B::one() &lt;&lt; extra_bits) - B::one();
             <span class="kw">let </span>storage_len = <span class="self">self</span>.storage.len();
             <span class="prelude-val">Some</span>((<span class="kw-2">&amp;mut </span><span class="self">self</span>.storage[storage_len - <span class="number">1</span>], mask))
         } <span class="kw">else </span>{
             <span class="prelude-val">None
         </span>}
     }

     <span class="doccomment">/// An operation might screw up the unused bits in the last block of the
     /// `BitVec`. As per (3), it&#39;s assumed to be all 0s. This method fixes it up.
     </span><span class="kw">fn </span>fix_last_block(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">if let </span><span class="prelude-val">Some</span>((last_block, used_bits)) = <span class="self">self</span>.last_block_mut_with_mask() {
             <span class="kw-2">*</span>last_block = <span class="kw-2">*</span>last_block &amp; used_bits;
         }
     }

     <span class="doccomment">/// Operations such as change detection for xnor, nor and nand are easiest
     /// to implement when unused bits are all set to 1s.
     </span><span class="kw">fn </span>fix_last_block_with_ones(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">if let </span><span class="prelude-val">Some</span>((last_block, used_bits)) = <span class="self">self</span>.last_block_mut_with_mask() {
             <span class="kw-2">*</span>last_block = <span class="kw-2">*</span>last_block | !used_bits;
         }
     }

     <span class="doccomment">/// Check whether last block&#39;s invariant is fine.
     </span><span class="kw">fn </span>is_last_block_fixed(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="kw">if let </span><span class="prelude-val">Some</span>((last_block, used_bits)) = <span class="self">self</span>.last_block_with_mask() {
             last_block &amp; !used_bits == B::zero()
         } <span class="kw">else </span>{
             <span class="bool-val">true
         </span>}
     }

     <span class="doccomment">/// Ensure the invariant for the last block.
     ///
     /// An operation might screw up the unused bits in the last block of the
     /// `BitVec`.
     ///
     /// This method fails in case the last block is not fixed. The check
     /// is skipped outside testing.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>ensure_invariant(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="kw">if </span><span class="macro">cfg!</span>(test) {
             <span class="macro">debug_assert!</span>(<span class="self">self</span>.is_last_block_fixed());
         }
     }

     <span class="doccomment">/// Retrieves the value at index `i`, or `None` if the index is out of bounds.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let bv = BitVec::from_bytes(&amp;[0b01100000]);
     /// assert_eq!(bv.get(0), Some(false));
     /// assert_eq!(bv.get(1), Some(true));
     /// assert_eq!(bv.get(100), None);
     ///
     /// // Can also use array indexing
     /// assert_eq!(bv[1], true);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>get(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; <span class="prelude-ty">Option</span>&lt;bool&gt; {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">if </span>i &gt;= <span class="self">self</span>.nbits {
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="kw">let </span>w = i / B::bits();
         <span class="kw">let </span>b = i % B::bits();
         <span class="self">self</span>.storage.get(w).map(|<span class="kw-2">&amp;</span>block|
             (block &amp; (B::one() &lt;&lt; b)) != B::zero()
         )
     }

     <span class="doccomment">/// Sets the value of a bit at an index `i`.
     ///
     /// # Panics
     ///
     /// Panics if `i` is out of bounds.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(5, false);
     /// bv.set(3, true);
     /// assert_eq!(bv[3], true);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set(<span class="kw-2">&amp;mut </span><span class="self">self</span>, i: usize, x: bool) {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">assert!</span>(i &lt; <span class="self">self</span>.nbits, <span class="string">&quot;index out of bounds: {:?} &gt;= {:?}&quot;</span>, i, <span class="self">self</span>.nbits);
         <span class="kw">let </span>w = i / B::bits();
         <span class="kw">let </span>b = i % B::bits();
         <span class="kw">let </span>flag = B::one() &lt;&lt; b;
         <span class="kw">let </span>val = <span class="kw">if </span>x { <span class="self">self</span>.storage[w] | flag }
                   <span class="kw">else </span>{ <span class="self">self</span>.storage[w] &amp; !flag };
         <span class="self">self</span>.storage[w] = val;
     }

     <span class="doccomment">/// Sets all bits to 1.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let before = 0b01100000;
     /// let after  = 0b11111111;
     ///
     /// let mut bv = BitVec::from_bytes(&amp;[before]);
     /// bv.set_all();
     /// assert_eq!(bv, BitVec::from_bytes(&amp;[after]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_all(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">for </span>w <span class="kw">in </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.storage { <span class="kw-2">*</span>w = !B::zero(); }
         <span class="self">self</span>.fix_last_block();
     }

     <span class="doccomment">/// Flips all bits.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let before = 0b01100000;
     /// let after  = 0b10011111;
     ///
     /// let mut bv = BitVec::from_bytes(&amp;[before]);
     /// bv.negate();
     /// assert_eq!(bv, BitVec::from_bytes(&amp;[after]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>negate(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">for </span>w <span class="kw">in </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.storage { <span class="kw-2">*</span>w = !<span class="kw-2">*</span>w; }
         <span class="self">self</span>.fix_last_block();
     }

     <span class="doccomment">/// Calculates the union of two bitvectors. This acts like the bitwise `or`
     /// function.
     ///
     /// Sets `self` to the union of `self` and `other`. Both bitvectors must be
     /// the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different lengths.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100100;
     /// let b   = 0b01011010;
     /// let res = 0b01111110;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.union(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[deprecated(
         since = <span class="string">&quot;0.7.0&quot;</span>,
         note = <span class="string">&quot;Please use the &#39;or&#39; function instead&quot;
     </span>)]
     #[inline]
     </span><span class="kw">pub fn </span>union(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.or(other)
     }

     <span class="doccomment">/// Calculates the intersection of two bitvectors. This acts like the
     /// bitwise `and` function.
     ///
     /// Sets `self` to the intersection of `self` and `other`. Both bitvectors
     /// must be the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different lengths.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100100;
     /// let b   = 0b01011010;
     /// let res = 0b01000000;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.intersect(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[deprecated(
         since = <span class="string">&quot;0.7.0&quot;</span>,
         note = <span class="string">&quot;Please use the &#39;and&#39; function instead&quot;
     </span>)]
     #[inline]
     </span><span class="kw">pub fn </span>intersect(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.and(other)
     }

     <span class="doccomment">/// Calculates the bitwise `or` of two bitvectors.
     ///
     /// Sets `self` to the union of `self` and `other`. Both bitvectors must be
     /// the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different lengths.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100100;
     /// let b   = 0b01011010;
     /// let res = 0b01111110;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.or(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>or(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="self">self</span>.process(other, |w1, w2| (w1 | w2))
     }

     <span class="doccomment">/// Calculates the bitwise `and` of two bitvectors.
     ///
     /// Sets `self` to the intersection of `self` and `other`. Both bitvectors
     /// must be the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different lengths.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100100;
     /// let b   = 0b01011010;
     /// let res = 0b01000000;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.and(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>and(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="self">self</span>.process(other, |w1, w2| (w1 &amp; w2))
     }

     <span class="doccomment">/// Calculates the difference between two bitvectors.
     ///
     /// Sets each element of `self` to the value of that element minus the
     /// element of `other` at the same index. Both bitvectors must be the same
     /// length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different length.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100100;
     /// let b   = 0b01011010;
     /// let a_b = 0b00100100; // a - b
     /// let b_a = 0b00011010; // b - a
     ///
     /// let mut bva = BitVec::from_bytes(&amp;[a]);
     /// let bvb = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(bva.difference(&amp;bvb));
     /// assert_eq!(bva, BitVec::from_bytes(&amp;[a_b]));
     ///
     /// let bva = BitVec::from_bytes(&amp;[a]);
     /// let mut bvb = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(bvb.difference(&amp;bva));
     /// assert_eq!(bvb, BitVec::from_bytes(&amp;[b_a]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>difference(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="self">self</span>.process(other, |w1, w2| (w1 &amp; !w2))
     }

     <span class="doccomment">/// Calculates the xor of two bitvectors.
     ///
     /// Sets `self` to the xor of `self` and `other`. Both bitvectors must be
     /// the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different length.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100110;
     /// let b   = 0b01010100;
     /// let res = 0b00110010;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.xor(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>xor(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="self">self</span>.process(other, |w1, w2| (w1 ^ w2))
     }

     <span class="doccomment">/// Calculates the nand of two bitvectors.
     ///
     /// Sets `self` to the nand of `self` and `other`. Both bitvectors must be
     /// the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different length.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100110;
     /// let b   = 0b01010100;
     /// let res = 0b10111011;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.nand(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>nand(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="self">self</span>.fix_last_block_with_ones();
         <span class="kw">let </span>result = <span class="self">self</span>.process(other, |w1, w2| !(w1 &amp; w2));
         <span class="self">self</span>.fix_last_block();
         result
     }

     <span class="doccomment">/// Calculates the nor of two bitvectors.
     ///
     /// Sets `self` to the nor of `self` and `other`. Both bitvectors must be
     /// the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different length.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100110;
     /// let b   = 0b01010100;
     /// let res = 0b10001001;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.nor(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>nor(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="self">self</span>.fix_last_block_with_ones();
         <span class="kw">let </span>result = <span class="self">self</span>.process(other, |w1, w2| !(w1 | w2));
         <span class="self">self</span>.fix_last_block();
         result
     }

     <span class="doccomment">/// Calculates the xnor of two bitvectors.
     ///
     /// Sets `self` to the xnor of `self` and `other`. Both bitvectors must be
     /// the same length. Returns `true` if `self` changed.
     ///
     /// # Panics
     ///
     /// Panics if the bitvectors are of different length.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let a   = 0b01100110;
     /// let b   = 0b01010100;
     /// let res = 0b11001101;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[a]);
     /// let b = BitVec::from_bytes(&amp;[b]);
     ///
     /// assert!(a.xnor(&amp;b));
     /// assert_eq!(a, BitVec::from_bytes(&amp;[res]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>xnor(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="self">self</span>.fix_last_block_with_ones();
         <span class="kw">let </span>result = <span class="self">self</span>.process(other, |w1, w2| !(w1 ^ w2));
         <span class="self">self</span>.fix_last_block();
         result
     }

     <span class="doccomment">/// Returns `true` if all bits are 1.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(5, true);
     /// assert_eq!(bv.all(), true);
     ///
     /// bv.set(1, false);
     /// assert_eq!(bv.all(), false);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>all(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">let </span><span class="kw-2">mut </span>last_word = !B::zero();
         <span class="comment">// Check that every block but the last is all-ones...
         </span><span class="self">self</span>.blocks().all(|elem| {
             <span class="kw">let </span>tmp = last_word;
             last_word = elem;
             tmp == !B::zero()
         <span class="comment">// and then check the last one has enough ones
         </span>}) &amp;&amp; (last_word == mask_for_bits(<span class="self">self</span>.nbits))
     }

     <span class="doccomment">/// Returns an iterator over the elements of the vector in order.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let bv = BitVec::from_bytes(&amp;[0b01110100, 0b10010010]);
     /// assert_eq!(bv.iter().filter(|x| *x).count(), 7);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>iter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Iter&lt;B&gt; {
         <span class="self">self</span>.ensure_invariant();
         Iter { bit_vec: <span class="self">self</span>, range: <span class="number">0</span>..<span class="self">self</span>.nbits }
     }

     <span class="doccomment">/// Moves all bits from `other` into `Self`, leaving `other` empty.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut a = BitVec::from_bytes(&amp;[0b10000000]);
     /// let mut b = BitVec::from_bytes(&amp;[0b01100001]);
     ///
     /// a.append(&amp;mut b);
     ///
     /// assert_eq!(a.len(), 16);
     /// assert_eq!(b.len(), 0);
     /// assert!(a.eq_vec(&amp;[true, false, false, false, false, false, false, false,
     ///                    false, true, true, false, false, false, false, true]));
     /// ```
     </span><span class="kw">pub fn </span>append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;mut </span><span class="self">Self</span>) {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());

         <span class="kw">let </span>b = <span class="self">self</span>.len() % B::bits();
         <span class="kw">let </span>o = other.len() % B::bits();
         <span class="kw">let </span>will_overflow = (b + o &gt; B::bits()) || (o == <span class="number">0 </span>&amp;&amp; b != <span class="number">0</span>);

         <span class="self">self</span>.nbits += other.len();
         other.nbits = <span class="number">0</span>;

         <span class="kw">if </span>b == <span class="number">0 </span>{
             <span class="self">self</span>.storage.append(<span class="kw-2">&amp;mut </span>other.storage);
         } <span class="kw">else </span>{
             <span class="self">self</span>.storage.reserve(other.storage.len());

             <span class="kw">for </span>block <span class="kw">in </span>other.storage.drain(..) {
             	{
             		<span class="kw">let </span>last = <span class="self">self</span>.storage.last_mut().unwrap();
                 	<span class="kw-2">*</span>last = <span class="kw-2">*</span>last | (block &lt;&lt; b);
                 }
                 <span class="self">self</span>.storage.push(block &gt;&gt; (B::bits() - b));
             }

             <span class="comment">// Remove additional block if the last shift did not overflow
             </span><span class="kw">if </span>!will_overflow {
                 <span class="self">self</span>.storage.pop();
             }
         }
     }

     <span class="doccomment">/// Splits the `BitVec` into two at the given bit,
     /// retaining the first half in-place and returning the second one.
     ///
     /// # Panics
     ///
     /// Panics if `at` is out of bounds.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     /// let mut a = BitVec::new();
     /// a.push(true);
     /// a.push(false);
     /// a.push(false);
     /// a.push(true);
     ///
     /// let b = a.split_off(2);
     ///
     /// assert_eq!(a.len(), 2);
     /// assert_eq!(b.len(), 2);
     /// assert!(a.eq_vec(&amp;[true, false]));
     /// assert!(b.eq_vec(&amp;[false, true]));
     /// ```
     </span><span class="kw">pub fn </span>split_off(<span class="kw-2">&amp;mut </span><span class="self">self</span>, at: usize) -&gt; <span class="self">Self </span>{
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">assert!</span>(at &lt;= <span class="self">self</span>.len(), <span class="string">&quot;`at` out of bounds&quot;</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>other = BitVec::&lt;B&gt;::default();

         <span class="kw">if </span>at == <span class="number">0 </span>{
             mem::swap(<span class="self">self</span>, <span class="kw-2">&amp;mut </span>other);
             <span class="kw">return </span>other;
         } <span class="kw">else if </span>at == <span class="self">self</span>.len() {
             <span class="kw">return </span>other;
         }

         <span class="kw">let </span>w = at / B::bits();
         <span class="kw">let </span>b = at % B::bits();
         other.nbits = <span class="self">self</span>.nbits - at;
         <span class="self">self</span>.nbits = at;
         <span class="kw">if </span>b == <span class="number">0 </span>{
             <span class="comment">// Split at block boundary
             </span>other.storage = <span class="self">self</span>.storage.split_off(w);
         } <span class="kw">else </span>{
             other.storage.reserve(<span class="self">self</span>.storage.len() - w);

             {
                 <span class="kw">let </span><span class="kw-2">mut </span>iter = <span class="self">self</span>.storage[w..].iter();
                 <span class="kw">let </span><span class="kw-2">mut </span>last = <span class="kw-2">*</span>iter.next().unwrap();
                 <span class="kw">for </span><span class="kw-2">&amp;</span>cur <span class="kw">in </span>iter {
                     other.storage.push((last &gt;&gt; b) | (cur &lt;&lt; (B::bits() - b)));
                     last = cur;
                 }
                 other.storage.push(last &gt;&gt; b);
             }

             <span class="self">self</span>.storage.truncate(w + <span class="number">1</span>);
             <span class="self">self</span>.fix_last_block();
         }

         other
     }

     <span class="doccomment">/// Returns `true` if all bits are 0.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(10, false);
     /// assert_eq!(bv.none(), true);
     ///
     /// bv.set(3, true);
     /// assert_eq!(bv.none(), false);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>none(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.blocks().all(|w| w == B::zero())
     }

     <span class="doccomment">/// Returns `true` if any bit is 1.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(10, false);
     /// assert_eq!(bv.any(), false);
     ///
     /// bv.set(3, true);
     /// assert_eq!(bv.any(), true);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>any(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         !<span class="self">self</span>.none()
     }

     <span class="doccomment">/// Organises the bits into bytes, such that the first bit in the
     /// `BitVec` becomes the high-order bit of the first byte. If the
     /// size of the `BitVec` is not a multiple of eight then trailing bits
     /// will be filled-in with `false`.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(3, true);
     /// bv.set(1, false);
     ///
     /// assert_eq!(bv.to_bytes(), [0b10100000]);
     ///
     /// let mut bv = BitVec::from_elem(9, false);
     /// bv.set(2, true);
     /// bv.set(8, true);
     ///
     /// assert_eq!(bv.to_bytes(), [0b00100000, 0b10000000]);
     /// ```
     </span><span class="kw">pub fn </span>to_bytes(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Vec&lt;u8&gt; {
         <span class="self">self</span>.ensure_invariant();
     	<span class="comment">// Oh lord, we&#39;re mapping this to bytes bit-by-bit!
         </span><span class="kw">fn </span>bit&lt;B: BitBlock&gt;(bit_vec: <span class="kw-2">&amp;</span>BitVec&lt;B&gt;, byte: usize, bit: usize) -&gt; u8 {
             <span class="kw">let </span>offset = byte * <span class="number">8 </span>+ bit;
             <span class="kw">if </span>offset &gt;= bit_vec.nbits {
                 <span class="number">0
             </span>} <span class="kw">else </span>{
                 (bit_vec[offset] <span class="kw">as </span>u8) &lt;&lt; (<span class="number">7 </span>- bit)
             }
         }

         <span class="kw">let </span>len = <span class="self">self</span>.nbits / <span class="number">8 </span>+
                   <span class="kw">if </span><span class="self">self</span>.nbits % <span class="number">8 </span>== <span class="number">0 </span>{ <span class="number">0 </span>} <span class="kw">else </span>{ <span class="number">1 </span>};
         (<span class="number">0</span>..len).map(|i|
             bit(<span class="self">self</span>, i, <span class="number">0</span>) |
             bit(<span class="self">self</span>, i, <span class="number">1</span>) |
             bit(<span class="self">self</span>, i, <span class="number">2</span>) |
             bit(<span class="self">self</span>, i, <span class="number">3</span>) |
             bit(<span class="self">self</span>, i, <span class="number">4</span>) |
             bit(<span class="self">self</span>, i, <span class="number">5</span>) |
             bit(<span class="self">self</span>, i, <span class="number">6</span>) |
             bit(<span class="self">self</span>, i, <span class="number">7</span>)
         ).collect()
     }

     <span class="doccomment">/// Compares a `BitVec` to a slice of `bool`s.
     /// Both the `BitVec` and slice must have the same length.
     ///
     /// # Panics
     ///
     /// Panics if the `BitVec` and slice are of different length.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let bv = BitVec::from_bytes(&amp;[0b10100000]);
     ///
     /// assert!(bv.eq_vec(&amp;[true, false, true, false,
     ///                     false, false, false, false]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>eq_vec(<span class="kw-2">&amp;</span><span class="self">self</span>, v: <span class="kw-2">&amp;</span>[bool]) -&gt; bool {
         <span class="macro">assert_eq!</span>(<span class="self">self</span>.nbits, v.len());
         <span class="self">self</span>.iter().zip(v.iter().cloned()).all(|(b1, b2)| b1 == b2)
     }

     <span class="doccomment">/// Shortens a `BitVec`, dropping excess elements.
     ///
     /// If `len` is greater than the vector&#39;s current length, this has no
     /// effect.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_bytes(&amp;[0b01001011]);
     /// bv.truncate(2);
     /// assert!(bv.eq_vec(&amp;[false, true]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>truncate(<span class="kw-2">&amp;mut </span><span class="self">self</span>, len: usize) {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">if </span>len &lt; <span class="self">self</span>.len() {
             <span class="self">self</span>.nbits = len;
             <span class="comment">// This fixes (2).
             </span><span class="self">self</span>.storage.truncate(blocks_for_bits::&lt;B&gt;(len));
             <span class="self">self</span>.fix_last_block();
         }
     }

     <span class="doccomment">/// Reserves capacity for at least `additional` more bits to be inserted in the given
     /// `BitVec`. The collection may reserve more space to avoid frequent reallocations.
     ///
     /// # Panics
     ///
     /// Panics if the new capacity overflows `usize`.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(3, false);
     /// bv.reserve(10);
     /// assert_eq!(bv.len(), 3);
     /// assert!(bv.capacity() &gt;= 13);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>reserve(<span class="kw-2">&amp;mut </span><span class="self">self</span>, additional: usize) {
         <span class="kw">let </span>desired_cap = <span class="self">self</span>.len().checked_add(additional).expect(<span class="string">&quot;capacity overflow&quot;</span>);
         <span class="kw">let </span>storage_len = <span class="self">self</span>.storage.len();
         <span class="kw">if </span>desired_cap &gt; <span class="self">self</span>.capacity() {
             <span class="self">self</span>.storage.reserve(blocks_for_bits::&lt;B&gt;(desired_cap) - storage_len);
         }
     }

     <span class="doccomment">/// Reserves the minimum capacity for exactly `additional` more bits to be inserted in the
     /// given `BitVec`. Does nothing if the capacity is already sufficient.
     ///
     /// Note that the allocator may give the collection more space than it requests. Therefore
     /// capacity can not be relied upon to be precisely minimal. Prefer `reserve` if future
     /// insertions are expected.
     ///
     /// # Panics
     ///
     /// Panics if the new capacity overflows `usize`.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_elem(3, false);
     /// bv.reserve(10);
     /// assert_eq!(bv.len(), 3);
     /// assert!(bv.capacity() &gt;= 13);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>reserve_exact(<span class="kw-2">&amp;mut </span><span class="self">self</span>, additional: usize) {
         <span class="kw">let </span>desired_cap = <span class="self">self</span>.len().checked_add(additional).expect(<span class="string">&quot;capacity overflow&quot;</span>);
         <span class="kw">let </span>storage_len = <span class="self">self</span>.storage.len();
         <span class="kw">if </span>desired_cap &gt; <span class="self">self</span>.capacity() {
             <span class="self">self</span>.storage.reserve_exact(blocks_for_bits::&lt;B&gt;(desired_cap) - storage_len);
         }
     }

     <span class="doccomment">/// Returns the capacity in bits for this bit vector. Inserting any
     /// element less than this amount will not trigger a resizing.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::new();
     /// bv.reserve(10);
     /// assert!(bv.capacity() &gt;= 10);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>capacity(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.storage.capacity().checked_mul(B::bits()).unwrap_or(usize::MAX)
     }

     <span class="doccomment">/// Grows the `BitVec` in-place, adding `n` copies of `value` to the `BitVec`.
     ///
     /// # Panics
     ///
     /// Panics if the new len overflows a `usize`.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_bytes(&amp;[0b01001011]);
     /// bv.grow(2, true);
     /// assert_eq!(bv.len(), 10);
     /// assert_eq!(bv.to_bytes(), [0b01001011, 0b11000000]);
     /// ```
     </span><span class="kw">pub fn </span>grow(<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: usize, value: bool) {
         <span class="self">self</span>.ensure_invariant();

         <span class="comment">// Note: we just bulk set all the bits in the last word in this fn in multiple places
         // which is technically wrong if not all of these bits are to be used. However, at the end
         // of this fn we call `fix_last_block` at the end of this fn, which should fix this.

         </span><span class="kw">let </span>new_nbits = <span class="self">self</span>.nbits.checked_add(n).expect(<span class="string">&quot;capacity overflow&quot;</span>);
         <span class="kw">let </span>new_nblocks = blocks_for_bits::&lt;B&gt;(new_nbits);
         <span class="kw">let </span>full_value = <span class="kw">if </span>value { !B::zero() } <span class="kw">else </span>{ B::zero() };

         <span class="comment">// Correct the old tail word, setting or clearing formerly unused bits
         </span><span class="kw">let </span>num_cur_blocks = blocks_for_bits::&lt;B&gt;(<span class="self">self</span>.nbits);
         <span class="kw">if </span><span class="self">self</span>.nbits % B::bits() &gt; <span class="number">0 </span>{
             <span class="kw">let </span>mask = mask_for_bits::&lt;B&gt;(<span class="self">self</span>.nbits);
             <span class="kw">if </span>value {
             	<span class="kw">let </span>block = <span class="kw-2">&amp;mut </span><span class="self">self</span>.storage[num_cur_blocks - <span class="number">1</span>];
                 <span class="kw-2">*</span>block = <span class="kw-2">*</span>block | !mask;
             } <span class="kw">else </span>{
                 <span class="comment">// Extra bits are already zero by invariant.
             </span>}
         }

         <span class="comment">// Fill in words after the old tail word
         </span><span class="kw">let </span>stop_idx = cmp::min(<span class="self">self</span>.storage.len(), new_nblocks);
         <span class="kw">for </span>idx <span class="kw">in </span>num_cur_blocks..stop_idx {
             <span class="self">self</span>.storage[idx] = full_value;
         }

         <span class="comment">// Allocate new words, if needed
         </span><span class="kw">if </span>new_nblocks &gt; <span class="self">self</span>.storage.len() {
             <span class="kw">let </span>to_add = new_nblocks - <span class="self">self</span>.storage.len();
             <span class="self">self</span>.storage.extend(repeat(full_value).take(to_add));
         }

         <span class="comment">// Adjust internal bit count
         </span><span class="self">self</span>.nbits = new_nbits;

         <span class="self">self</span>.fix_last_block();
     }

     <span class="doccomment">/// Removes the last bit from the BitVec, and returns it. Returns None if the BitVec is empty.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::from_bytes(&amp;[0b01001001]);
     /// assert_eq!(bv.pop(), Some(true));
     /// assert_eq!(bv.pop(), Some(false));
     /// assert_eq!(bv.len(), 6);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>pop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;bool&gt; {
         <span class="self">self</span>.ensure_invariant();

         <span class="kw">if </span><span class="self">self</span>.is_empty() {
             <span class="prelude-val">None
         </span>} <span class="kw">else </span>{
             <span class="kw">let </span>i = <span class="self">self</span>.nbits - <span class="number">1</span>;
             <span class="kw">let </span>ret = <span class="self">self</span>[i];
             <span class="comment">// (3)
             </span><span class="self">self</span>.set(i, <span class="bool-val">false</span>);
             <span class="self">self</span>.nbits = i;
             <span class="kw">if </span><span class="self">self</span>.nbits % B::bits() == <span class="number">0 </span>{
                 <span class="comment">// (2)
                 </span><span class="self">self</span>.storage.pop();
             }
             <span class="prelude-val">Some</span>(ret)
         }
     }

     <span class="doccomment">/// Pushes a `bool` onto the end.
     ///
     /// # Examples
     ///
     /// ```
     /// use bit_vec::BitVec;
     ///
     /// let mut bv = BitVec::new();
     /// bv.push(true);
     /// bv.push(false);
     /// assert!(bv.eq_vec(&amp;[true, false]));
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, elem: bool) {
         <span class="kw">if </span><span class="self">self</span>.nbits % B::bits() == <span class="number">0 </span>{
             <span class="self">self</span>.storage.push(B::zero());
         }
         <span class="kw">let </span>insert_pos = <span class="self">self</span>.nbits;
         <span class="self">self</span>.nbits = <span class="self">self</span>.nbits.checked_add(<span class="number">1</span>).expect(<span class="string">&quot;Capacity overflow&quot;</span>);
         <span class="self">self</span>.set(insert_pos, elem);
     }

     <span class="doccomment">/// Returns the total number of bits in this vector
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize { <span class="self">self</span>.nbits }

     <span class="doccomment">/// Sets the number of bits that this BitVec considers initialized.
     ///
     /// Almost certainly can cause bad stuff. Only really intended for BitSet.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub unsafe fn </span>set_len(<span class="kw-2">&amp;mut </span><span class="self">self</span>, len: usize) {
     	<span class="self">self</span>.nbits = len;
     }

     <span class="doccomment">/// Returns true if there are no bits in this vector
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool { <span class="self">self</span>.len() == <span class="number">0 </span>}

     <span class="doccomment">/// Clears all bits in this vector.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>clear(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">for </span>w <span class="kw">in </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.storage { <span class="kw-2">*</span>w = B::zero(); }
     }

     <span class="doccomment">/// Shrinks the capacity of the underlying storage as much as
     /// possible.
     ///
     /// It will drop down as close as possible to the length but the
     /// allocator may still inform the underlying storage that there
     /// is space for a few more elements/bits.
     </span><span class="kw">pub fn </span>shrink_to_fit(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.storage.shrink_to_fit();
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; Default <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{ BitVec { storage: Vec::new(), nbits: <span class="number">0 </span>} }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; FromIterator&lt;bool&gt; <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>from_iter&lt;I: IntoIterator&lt;Item=bool&gt;&gt;(iter: I) -&gt; <span class="self">Self </span>{
         <span class="kw">let </span><span class="kw-2">mut </span>ret: <span class="self">Self </span>= Default::default();
         ret.extend(iter);
         ret
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; Extend&lt;bool&gt; <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>extend&lt;I: IntoIterator&lt;Item=bool&gt;&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, iterable: I) {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">let </span>iterator = iterable.into_iter();
         <span class="kw">let </span>(min, <span class="kw">_</span>) = iterator.size_hint();
         <span class="self">self</span>.reserve(min);
         <span class="kw">for </span>element <span class="kw">in </span>iterator {
             <span class="self">self</span>.push(element)
         }
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; Clone <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="self">self</span>.ensure_invariant();
         BitVec { storage: <span class="self">self</span>.storage.clone(), nbits: <span class="self">self</span>.nbits }
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>clone_from(<span class="kw-2">&amp;mut </span><span class="self">self</span>, source: <span class="kw-2">&amp;</span><span class="self">Self</span>) {
         <span class="macro">debug_assert!</span>(source.is_last_block_fixed());
         <span class="self">self</span>.nbits = source.nbits;
         <span class="self">self</span>.storage.clone_from(<span class="kw-2">&amp;</span>source.storage);
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; PartialOrd <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Ordering&gt; {
         <span class="prelude-val">Some</span>(<span class="self">self</span>.cmp(other))
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; Ord <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; Ordering {
         <span class="self">self</span>.ensure_invariant();
         <span class="macro">debug_assert!</span>(other.is_last_block_fixed());
         <span class="kw">let </span><span class="kw-2">mut </span>a = <span class="self">self</span>.iter();
         <span class="kw">let </span><span class="kw-2">mut </span>b = other.iter();
         <span class="kw">loop </span>{
             <span class="kw">match </span>(a.next(), b.next()) {
                 (<span class="prelude-val">Some</span>(x), <span class="prelude-val">Some</span>(y)) =&gt; <span class="kw">match </span>x.cmp(<span class="kw-2">&amp;</span>y) {
                     Ordering::Equal =&gt; {}
                     otherwise =&gt; <span class="kw">return </span>otherwise,
                 },
                 (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) =&gt; <span class="kw">return </span>Ordering::Equal,
                 (<span class="prelude-val">None</span>, <span class="kw">_</span>) =&gt; <span class="kw">return </span>Ordering::Less,
                 (<span class="kw">_</span>, <span class="prelude-val">None</span>) =&gt; <span class="kw">return </span>Ordering::Greater,
             }
         }
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; fmt::Debug <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="self">self</span>.ensure_invariant();
         <span class="kw">for </span>bit <span class="kw">in </span><span class="self">self </span>{
             <span class="macro">write!</span>(fmt, <span class="string">&quot;{}&quot;</span>, <span class="kw">if </span>bit { <span class="number">1 </span>} <span class="kw">else </span>{ <span class="number">0 </span>})<span class="question-mark">?</span>;
         }
         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; hash::Hash <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>hash&lt;H: hash::Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
         <span class="self">self</span>.ensure_invariant();
         <span class="self">self</span>.nbits.hash(state);
         <span class="kw">for </span>elem <span class="kw">in </span><span class="self">self</span>.blocks() {
             elem.hash(state);
         }
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; cmp::PartialEq <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
         <span class="kw">if </span><span class="self">self</span>.nbits != other.nbits {
             <span class="self">self</span>.ensure_invariant();
             other.ensure_invariant();
             <span class="kw">return </span><span class="bool-val">false</span>;
         }
         <span class="self">self</span>.blocks().zip(other.blocks()).all(|(w1, w2)| w1 == w2)
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; cmp::Eq <span class="kw">for </span>BitVec&lt;B&gt; {}

 <span class="doccomment">/// An iterator for `BitVec`.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Iter&lt;<span class="lifetime">&#39;a</span>, B: <span class="lifetime">&#39;a </span>= u32&gt; {
     bit_vec: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>BitVec&lt;B&gt;,
     range: Range&lt;usize&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, B: BitBlock&gt; Iterator <span class="kw">for </span>Iter&lt;<span class="lifetime">&#39;a</span>, B&gt; {
     <span class="kw">type </span>Item = bool;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;bool&gt; {
         <span class="comment">// NB: indexing is slow for extern crates when it has to go through &amp;TRUE or &amp;FALSE
         // variables.  get is more direct, and unwrap is fine since we&#39;re sure of the range.
         </span><span class="self">self</span>.range.next().map(|i| <span class="self">self</span>.bit_vec.get(i).unwrap())
     }

     <span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
         <span class="self">self</span>.range.size_hint()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, B: BitBlock&gt; DoubleEndedIterator <span class="kw">for </span>Iter&lt;<span class="lifetime">&#39;a</span>, B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>next_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;bool&gt; {
         <span class="self">self</span>.range.next_back().map(|i| <span class="self">self</span>.bit_vec.get(i).unwrap())
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, B: BitBlock&gt; ExactSizeIterator <span class="kw">for </span>Iter&lt;<span class="lifetime">&#39;a</span>, B&gt; {}

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, B: BitBlock&gt; IntoIterator <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>BitVec&lt;B&gt; {
     <span class="kw">type </span>Item = bool;
     <span class="kw">type </span>IntoIter = Iter&lt;<span class="lifetime">&#39;a</span>, B&gt;;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; Iter&lt;<span class="lifetime">&#39;a</span>, B&gt; {
         <span class="self">self</span>.iter()
     }
 }

 <span class="kw">pub struct </span>IntoIter&lt;B=u32&gt; {
     bit_vec: BitVec&lt;B&gt;,
     range: Range&lt;usize&gt;,
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; Iterator <span class="kw">for </span>IntoIter&lt;B&gt; {
     <span class="kw">type </span>Item = bool;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;bool&gt; {
         <span class="self">self</span>.range.next().map(|i| <span class="self">self</span>.bit_vec.get(i).unwrap())
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; DoubleEndedIterator <span class="kw">for </span>IntoIter&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>next_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;bool&gt; {
         <span class="self">self</span>.range.next_back().map(|i| <span class="self">self</span>.bit_vec.get(i).unwrap())
     }
 }

 <span class="kw">impl</span>&lt;B: BitBlock&gt; ExactSizeIterator <span class="kw">for </span>IntoIter&lt;B&gt; {}

 <span class="kw">impl</span>&lt;B: BitBlock&gt; IntoIterator <span class="kw">for </span>BitVec&lt;B&gt; {
     <span class="kw">type </span>Item = bool;
     <span class="kw">type </span>IntoIter = IntoIter&lt;B&gt;;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; IntoIter&lt;B&gt; {
         <span class="kw">let </span>nbits = <span class="self">self</span>.nbits;
         IntoIter { bit_vec: <span class="self">self</span>, range: <span class="number">0</span>..nbits }
     }
 }

 <span class="doccomment">/// An iterator over the blocks of a `BitVec`.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Blocks&lt;<span class="lifetime">&#39;a</span>, B: <span class="lifetime">&#39;a</span>&gt; {
     iter: slice::Iter&lt;<span class="lifetime">&#39;a</span>, B&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, B: BitBlock&gt; Iterator <span class="kw">for </span>Blocks&lt;<span class="lifetime">&#39;a</span>, B&gt; {
     <span class="kw">type </span>Item = B;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;B&gt; {
         <span class="self">self</span>.iter.next().cloned()
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
         <span class="self">self</span>.iter.size_hint()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, B: BitBlock&gt; DoubleEndedIterator <span class="kw">for </span>Blocks&lt;<span class="lifetime">&#39;a</span>, B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>next_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;B&gt; {
         <span class="self">self</span>.iter.next_back().cloned()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, B: BitBlock&gt; ExactSizeIterator <span class="kw">for </span>Blocks&lt;<span class="lifetime">&#39;a</span>, B&gt; {}

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use super</span>::{BitVec, Iter, Vec};

     <span class="comment">// This is stupid, but I want to differentiate from a &quot;random&quot; 32
     </span><span class="kw">const </span>U32_BITS: usize = <span class="number">32</span>;

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_to_str() {
         <span class="kw">let </span>zerolen = BitVec::new();
         <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, zerolen), <span class="string">&quot;&quot;</span>);

         <span class="kw">let </span>eightbits = BitVec::from_elem(<span class="number">8</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, eightbits), <span class="string">&quot;00000000&quot;</span>)
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_0_elements() {
         <span class="kw">let </span>act = BitVec::new();
         <span class="kw">let </span>exp = Vec::new();
         <span class="macro">assert!</span>(act.eq_vec(<span class="kw-2">&amp;</span>exp));
         <span class="macro">assert!</span>(act.none() &amp;&amp; act.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_1_element() {
         <span class="kw">let </span><span class="kw-2">mut </span>act = BitVec::from_elem(<span class="number">1</span>, <span class="bool-val">false</span>);
         <span class="macro">assert!</span>(act.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(act.none() &amp;&amp; !act.all());
         act = BitVec::from_elem(<span class="number">1</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; act.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_2_elements() {
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">2</span>, <span class="bool-val">false</span>);
         b.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         b.set(<span class="number">1</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, b), <span class="string">&quot;10&quot;</span>);
         <span class="macro">assert!</span>(!b.none() &amp;&amp; !b.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_10_elements() {
         <span class="kw">let </span><span class="kw-2">mut </span>act;
         <span class="comment">// all 0

         </span>act = BitVec::from_elem(<span class="number">10</span>, <span class="bool-val">false</span>);
         <span class="macro">assert!</span>((act.eq_vec(
                     <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>])));
         <span class="macro">assert!</span>(act.none() &amp;&amp; !act.all());
         <span class="comment">// all 1

         </span>act = BitVec::from_elem(<span class="number">10</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>((act.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>])));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">10</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">4</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>((act.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>])));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">10</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">5</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">6</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">7</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">8</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">9</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>((act.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>])));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">10</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">6</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">9</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>((act.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>])));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_31_elements() {
         <span class="kw">let </span><span class="kw-2">mut </span>act;
         <span class="comment">// all 0

         </span>act = BitVec::from_elem(<span class="number">31</span>, <span class="bool-val">false</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(act.none() &amp;&amp; !act.all());
         <span class="comment">// all 1

         </span>act = BitVec::from_elem(<span class="number">31</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">31</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">4</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">5</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">6</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">7</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">31</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">16</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">17</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">18</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">19</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">20</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">21</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">22</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">23</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">31</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">24</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">25</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">26</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">27</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">28</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">29</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">30</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">31</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">17</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">30</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_32_elements() {
         <span class="kw">let </span><span class="kw-2">mut </span>act;
         <span class="comment">// all 0

         </span>act = BitVec::from_elem(<span class="number">32</span>, <span class="bool-val">false</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(act.none() &amp;&amp; !act.all());
         <span class="comment">// all 1

         </span>act = BitVec::from_elem(<span class="number">32</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">32</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">4</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">5</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">6</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">7</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">32</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">16</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">17</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">18</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">19</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">20</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">21</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">22</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">23</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">32</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">24</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">25</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">26</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">27</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">28</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">29</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">30</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">31</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">32</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">17</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">30</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">31</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_33_elements() {
         <span class="kw">let </span><span class="kw-2">mut </span>act;
         <span class="comment">// all 0

         </span>act = BitVec::from_elem(<span class="number">33</span>, <span class="bool-val">false</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(act.none() &amp;&amp; !act.all());
         <span class="comment">// all 1

         </span>act = BitVec::from_elem(<span class="number">33</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">33</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">4</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">5</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">6</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">7</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">33</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">16</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">17</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">18</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">19</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">20</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">21</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">22</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">23</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">33</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">24</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">25</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">26</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">27</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">28</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">29</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">30</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">31</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
         <span class="comment">// mixed

         </span>act = BitVec::from_elem(<span class="number">33</span>, <span class="bool-val">false</span>);
         act.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">17</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">30</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">31</span>, <span class="bool-val">true</span>);
         act.set(<span class="number">32</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(act.eq_vec(
                 <span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                   <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(!act.none() &amp;&amp; !act.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_equal_differing_sizes() {
         <span class="kw">let </span>v0 = BitVec::from_elem(<span class="number">10</span>, <span class="bool-val">false</span>);
         <span class="kw">let </span>v1 = BitVec::from_elem(<span class="number">11</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_ne!</span>(v0, v1);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_equal_greatly_differing_sizes() {
         <span class="kw">let </span>v0 = BitVec::from_elem(<span class="number">10</span>, <span class="bool-val">false</span>);
         <span class="kw">let </span>v1 = BitVec::from_elem(<span class="number">110</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_ne!</span>(v0, v1);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_equal_sneaky_small() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_elem(<span class="number">1</span>, <span class="bool-val">false</span>);
         a.set(<span class="number">0</span>, <span class="bool-val">true</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">1</span>, <span class="bool-val">true</span>);
         b.set(<span class="number">0</span>, <span class="bool-val">true</span>);

         <span class="macro">assert_eq!</span>(a, b);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_equal_sneaky_big() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_elem(<span class="number">100</span>, <span class="bool-val">false</span>);
         <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">100 </span>{
             a.set(i, <span class="bool-val">true</span>);
         }

         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">100</span>, <span class="bool-val">true</span>);
         <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">100 </span>{
             b.set(i, <span class="bool-val">true</span>);
         }

         <span class="macro">assert_eq!</span>(a, b);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_from_bytes() {
         <span class="kw">let </span>bit_vec = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10110110</span>, <span class="number">0b00000000</span>, <span class="number">0b11111111</span>]);
         <span class="kw">let </span>str = <span class="macro">concat!</span>(<span class="string">&quot;10110110&quot;</span>, <span class="string">&quot;00000000&quot;</span>, <span class="string">&quot;11111111&quot;</span>);
         <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, bit_vec), str);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_to_bytes() {
         <span class="kw">let </span><span class="kw-2">mut </span>bv = BitVec::from_elem(<span class="number">3</span>, <span class="bool-val">true</span>);
         bv.set(<span class="number">1</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(bv.to_bytes(), [<span class="number">0b10100000</span>]);

         <span class="kw">let </span><span class="kw-2">mut </span>bv = BitVec::from_elem(<span class="number">9</span>, <span class="bool-val">false</span>);
         bv.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         bv.set(<span class="number">8</span>, <span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(bv.to_bytes(), [<span class="number">0b00100000</span>, <span class="number">0b10000000</span>]);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_from_bools() {
         <span class="kw">let </span>bools = <span class="macro">vec!</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>];
         <span class="kw">let </span>bit_vec: BitVec = bools.iter().map(|n| <span class="kw-2">*</span>n).collect();
         <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, bit_vec), <span class="string">&quot;1011&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_to_bools() {
         <span class="kw">let </span>bools = <span class="macro">vec!</span>[<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>];
         <span class="macro">assert_eq!</span>(BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b00100110</span>]).iter().collect::&lt;Vec&lt;bool&gt;&gt;(), bools);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_iterator() {
         <span class="kw">let </span>bools = <span class="macro">vec!</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>];
         <span class="kw">let </span>bit_vec: BitVec = bools.iter().map(|n| <span class="kw-2">*</span>n).collect();

         <span class="macro">assert_eq!</span>(bit_vec.iter().collect::&lt;Vec&lt;bool&gt;&gt;(), bools);

         <span class="kw">let </span>long: Vec&lt;<span class="kw">_</span>&gt; = (<span class="number">0</span>..<span class="number">10000</span>).map(|i| i % <span class="number">2 </span>== <span class="number">0</span>).collect();
         <span class="kw">let </span>bit_vec: BitVec = long.iter().map(|n| <span class="kw-2">*</span>n).collect();
         <span class="macro">assert_eq!</span>(bit_vec.iter().collect::&lt;Vec&lt;bool&gt;&gt;(), long)
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_small_difference() {
         <span class="kw">let </span><span class="kw-2">mut </span>b1 = BitVec::from_elem(<span class="number">3</span>, <span class="bool-val">false</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>b2 = BitVec::from_elem(<span class="number">3</span>, <span class="bool-val">false</span>);
         b1.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         b1.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         b2.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         b2.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(b1.difference(<span class="kw-2">&amp;</span>b2));
         <span class="macro">assert!</span>(b1[<span class="number">0</span>]);
         <span class="macro">assert!</span>(!b1[<span class="number">1</span>]);
         <span class="macro">assert!</span>(!b1[<span class="number">2</span>]);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_big_difference() {
         <span class="kw">let </span><span class="kw-2">mut </span>b1 = BitVec::from_elem(<span class="number">100</span>, <span class="bool-val">false</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>b2 = BitVec::from_elem(<span class="number">100</span>, <span class="bool-val">false</span>);
         b1.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         b1.set(<span class="number">40</span>, <span class="bool-val">true</span>);
         b2.set(<span class="number">40</span>, <span class="bool-val">true</span>);
         b2.set(<span class="number">80</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(b1.difference(<span class="kw-2">&amp;</span>b2));
         <span class="macro">assert!</span>(b1[<span class="number">0</span>]);
         <span class="macro">assert!</span>(!b1[<span class="number">40</span>]);
         <span class="macro">assert!</span>(!b1[<span class="number">80</span>]);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_small_xor() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b0011</span>]);
         <span class="kw">let </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b0101</span>]);
         <span class="kw">let </span>c = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b0110</span>]);
         <span class="macro">assert!</span>(a.xor(<span class="kw-2">&amp;</span>b));
         <span class="macro">assert_eq!</span>(a,c);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_small_xnor() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b0011</span>]);
         <span class="kw">let </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b1111_0101</span>]);
         <span class="kw">let </span>c = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b1001</span>]);
         <span class="macro">assert!</span>(a.xnor(<span class="kw-2">&amp;</span>b));
         <span class="macro">assert_eq!</span>(a,c);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_small_nand() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b1111_0011</span>]);
         <span class="kw">let </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b1111_0101</span>]);
         <span class="kw">let </span>c = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b1110</span>]);
         <span class="macro">assert!</span>(a.nand(<span class="kw-2">&amp;</span>b));
         <span class="macro">assert_eq!</span>(a,c);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_small_nor() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b0011</span>]);
         <span class="kw">let </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b1111_0101</span>]);
         <span class="kw">let </span>c = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b1000</span>]);
         <span class="macro">assert!</span>(a.nor(<span class="kw-2">&amp;</span>b));
         <span class="macro">assert_eq!</span>(a,c);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_big_xor() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00010100</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00110100</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]);
         <span class="kw">let </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00010100</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00110100</span>]);
         <span class="kw">let </span>c = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00110100</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00110100</span>]);
         <span class="macro">assert!</span>(a.xor(<span class="kw-2">&amp;</span>b));
         <span class="macro">assert_eq!</span>(a,c);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_big_xnor() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00010100</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00110100</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]);
         <span class="kw">let </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00010100</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00110100</span>]);
         <span class="kw">let </span>c = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span>!<span class="number">0</span>, !<span class="number">0</span>, !<span class="number">0</span>, !<span class="number">0</span>,
             !<span class="number">0</span>, !<span class="number">0</span>, !<span class="number">0</span>, !<span class="number">0b00110100</span>,
             !<span class="number">0</span>, !<span class="number">0</span>, !<span class="number">0b00110100</span>]);
         <span class="macro">assert!</span>(a.xnor(<span class="kw-2">&amp;</span>b));
         <span class="macro">assert_eq!</span>(a,c);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_small_clear() {
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">14</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(!b.none() &amp;&amp; b.all());
         b.clear();
         <span class="macro">assert!</span>(b.none() &amp;&amp; !b.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_big_clear() {
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">140</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(!b.none() &amp;&amp; b.all());
         b.clear();
         <span class="macro">assert!</span>(b.none() &amp;&amp; !b.all());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_lt() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_elem(<span class="number">5</span>, <span class="bool-val">false</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">5</span>, <span class="bool-val">false</span>);

         <span class="macro">assert!</span>(!(a &lt; b) &amp;&amp; !(b &lt; a));
         b.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(a &lt; b);
         a.set(<span class="number">3</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(a &lt; b);
         a.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(!(a &lt; b) &amp;&amp; b &lt; a);
         b.set(<span class="number">0</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(a &lt; b);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_ord() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_elem(<span class="number">5</span>, <span class="bool-val">false</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">5</span>, <span class="bool-val">false</span>);

         <span class="macro">assert!</span>(a &lt;= b &amp;&amp; a &gt;= b);
         a.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(a &gt; b &amp;&amp; a &gt;= b);
         <span class="macro">assert!</span>(b &lt; a &amp;&amp; b &lt;= a);
         b.set(<span class="number">1</span>, <span class="bool-val">true</span>);
         b.set(<span class="number">2</span>, <span class="bool-val">true</span>);
         <span class="macro">assert!</span>(b &gt; a &amp;&amp; b &gt;= a);
         <span class="macro">assert!</span>(a &lt; b &amp;&amp; a &lt;= b);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_small_bit_vec_tests() {
         <span class="kw">let </span>v = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0</span>]);
         <span class="macro">assert!</span>(!v.all());
         <span class="macro">assert!</span>(!v.any());
         <span class="macro">assert!</span>(v.none());

         <span class="kw">let </span>v = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b00010100</span>]);
         <span class="macro">assert!</span>(!v.all());
         <span class="macro">assert!</span>(v.any());
         <span class="macro">assert!</span>(!v.none());

         <span class="kw">let </span>v = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0xFF</span>]);
         <span class="macro">assert!</span>(v.all());
         <span class="macro">assert!</span>(v.any());
         <span class="macro">assert!</span>(!v.none());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_big_bit_vec_tests() {
         <span class="kw">let </span>v = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]);
         <span class="macro">assert!</span>(!v.all());
         <span class="macro">assert!</span>(!v.any());
         <span class="macro">assert!</span>(v.none());

         <span class="kw">let </span>v = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00010100</span>, <span class="number">0</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0b00110100</span>,
             <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]);
         <span class="macro">assert!</span>(!v.all());
         <span class="macro">assert!</span>(v.any());
         <span class="macro">assert!</span>(!v.none());

         <span class="kw">let </span>v = BitVec::from_bytes(<span class="kw-2">&amp;</span>[ <span class="comment">// 88 bits
             </span><span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>,
             <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>,
             <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>]);
         <span class="macro">assert!</span>(v.all());
         <span class="macro">assert!</span>(v.any());
         <span class="macro">assert!</span>(!v.none());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_push_pop() {
         <span class="kw">let </span><span class="kw-2">mut </span>s = BitVec::from_elem(<span class="number">5 </span>* U32_BITS - <span class="number">2</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">5 </span>* U32_BITS - <span class="number">2</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS - <span class="number">3</span>], <span class="bool-val">false</span>);
         s.push(<span class="bool-val">true</span>);
         s.push(<span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS - <span class="number">2</span>], <span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS - <span class="number">1</span>], <span class="bool-val">true</span>);
         <span class="comment">// Here the internal vector will need to be extended
         </span>s.push(<span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS], <span class="bool-val">false</span>);
         s.push(<span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS + <span class="number">1</span>], <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">5 </span>* U32_BITS + <span class="number">2</span>);
         <span class="comment">// Pop it all off
         </span><span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">Some</span>(<span class="bool-val">false</span>));
         <span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">Some</span>(<span class="bool-val">false</span>));
         <span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">Some</span>(<span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">Some</span>(<span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">5 </span>* U32_BITS - <span class="number">2</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_truncate() {
         <span class="kw">let </span><span class="kw-2">mut </span>s = BitVec::from_elem(<span class="number">5 </span>* U32_BITS, <span class="bool-val">true</span>);

         <span class="macro">assert_eq!</span>(s, BitVec::from_elem(<span class="number">5 </span>* U32_BITS, <span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">5 </span>* U32_BITS);
         s.truncate(<span class="number">4 </span>* U32_BITS);
         <span class="macro">assert_eq!</span>(s, BitVec::from_elem(<span class="number">4 </span>* U32_BITS, <span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">4 </span>* U32_BITS);
         <span class="comment">// Truncating to a size &gt; s.len() should be a noop
         </span>s.truncate(<span class="number">5 </span>* U32_BITS);
         <span class="macro">assert_eq!</span>(s, BitVec::from_elem(<span class="number">4 </span>* U32_BITS, <span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">4 </span>* U32_BITS);
         s.truncate(<span class="number">3 </span>* U32_BITS - <span class="number">10</span>);
         <span class="macro">assert_eq!</span>(s, BitVec::from_elem(<span class="number">3 </span>* U32_BITS - <span class="number">10</span>, <span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">3 </span>* U32_BITS - <span class="number">10</span>);
         s.truncate(<span class="number">0</span>);
         <span class="macro">assert_eq!</span>(s, BitVec::from_elem(<span class="number">0</span>, <span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(s.len(), <span class="number">0</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_reserve() {
         <span class="kw">let </span><span class="kw-2">mut </span>s = BitVec::from_elem(<span class="number">5 </span>* U32_BITS, <span class="bool-val">true</span>);
         <span class="comment">// Check capacity
         </span><span class="macro">assert!</span>(s.capacity() &gt;= <span class="number">5 </span>* U32_BITS);
         s.reserve(<span class="number">2 </span>* U32_BITS);
         <span class="macro">assert!</span>(s.capacity() &gt;= <span class="number">7 </span>* U32_BITS);
         s.reserve(<span class="number">7 </span>* U32_BITS);
         <span class="macro">assert!</span>(s.capacity() &gt;= <span class="number">12 </span>* U32_BITS);
         s.reserve_exact(<span class="number">7 </span>* U32_BITS);
         <span class="macro">assert!</span>(s.capacity() &gt;= <span class="number">12 </span>* U32_BITS);
         s.reserve(<span class="number">7 </span>* U32_BITS + <span class="number">1</span>);
         <span class="macro">assert!</span>(s.capacity() &gt;= <span class="number">12 </span>* U32_BITS + <span class="number">1</span>);
         <span class="comment">// Check that length hasn&#39;t changed
         </span><span class="macro">assert_eq!</span>(s.len(), <span class="number">5 </span>* U32_BITS);
         s.push(<span class="bool-val">true</span>);
         s.push(<span class="bool-val">false</span>);
         s.push(<span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS - <span class="number">1</span>], <span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS - <span class="number">0</span>], <span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS + <span class="number">1</span>], <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(s[<span class="number">5 </span>* U32_BITS + <span class="number">2</span>], <span class="bool-val">true</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_grow() {
         <span class="kw">let </span><span class="kw-2">mut </span>bit_vec = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10110110</span>, <span class="number">0b00000000</span>, <span class="number">0b10101010</span>]);
         bit_vec.grow(<span class="number">32</span>, <span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(bit_vec, BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10110110</span>, <span class="number">0b00000000</span>, <span class="number">0b10101010</span>,
                                      <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>]));
         bit_vec.grow(<span class="number">64</span>, <span class="bool-val">false</span>);
         <span class="macro">assert_eq!</span>(bit_vec, BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10110110</span>, <span class="number">0b00000000</span>, <span class="number">0b10101010</span>,
                                      <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]));
         bit_vec.grow(<span class="number">16</span>, <span class="bool-val">true</span>);
         <span class="macro">assert_eq!</span>(bit_vec, BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10110110</span>, <span class="number">0b00000000</span>, <span class="number">0b10101010</span>,
                                      <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0xFF</span>, <span class="number">0xFF</span>]));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_extend() {
         <span class="kw">let </span><span class="kw-2">mut </span>bit_vec = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10110110</span>, <span class="number">0b00000000</span>, <span class="number">0b11111111</span>]);
         <span class="kw">let </span>ext = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b01001001</span>, <span class="number">0b10010010</span>, <span class="number">0b10111101</span>]);
         bit_vec.extend(ext.iter());
         <span class="macro">assert_eq!</span>(bit_vec, BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10110110</span>, <span class="number">0b00000000</span>, <span class="number">0b11111111</span>,
                                      <span class="number">0b01001001</span>, <span class="number">0b10010010</span>, <span class="number">0b10111101</span>]));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_append() {
         <span class="comment">// Append to BitVec that holds a multiple of U32_BITS bits
         </span><span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10100000</span>, <span class="number">0b00010010</span>, <span class="number">0b10010010</span>, <span class="number">0b00110011</span>]);
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::new();
         b.push(<span class="bool-val">false</span>);
         b.push(<span class="bool-val">true</span>);
         b.push(<span class="bool-val">true</span>);

         a.append(<span class="kw-2">&amp;mut </span>b);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">35</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">0</span>);
         <span class="macro">assert!</span>(b.capacity() &gt;= <span class="number">3</span>);

         <span class="macro">assert!</span>(a.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));

         <span class="comment">// Append to arbitrary BitVec
         </span><span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::new();
         a.push(<span class="bool-val">true</span>);
         a.push(<span class="bool-val">false</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10100000</span>, <span class="number">0b00010010</span>, <span class="number">0b10010010</span>, <span class="number">0b00110011</span>, <span class="number">0b10010101</span>]);

         a.append(<span class="kw-2">&amp;mut </span>b);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">42</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">0</span>);
         <span class="macro">assert!</span>(b.capacity() &gt;= <span class="number">40</span>);

         <span class="macro">assert!</span>(a.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">true</span>]));

         <span class="comment">// Append to empty BitVec
         </span><span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::new();
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10100000</span>, <span class="number">0b00010010</span>, <span class="number">0b10010010</span>, <span class="number">0b00110011</span>, <span class="number">0b10010101</span>]);

         a.append(<span class="kw-2">&amp;mut </span>b);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">40</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">0</span>);
         <span class="macro">assert!</span>(b.capacity() &gt;= <span class="number">40</span>);

         <span class="macro">assert!</span>(a.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>]));

         <span class="comment">// Append empty BitVec
         </span><span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10100000</span>, <span class="number">0b00010010</span>, <span class="number">0b10010010</span>, <span class="number">0b00110011</span>, <span class="number">0b10010101</span>]);
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::new();

         a.append(<span class="kw-2">&amp;mut </span>b);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">40</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">0</span>);

         <span class="macro">assert!</span>(a.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>]));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_split_off() {
         <span class="comment">// Split at 0
         </span><span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::new();
         a.push(<span class="bool-val">true</span>);
         a.push(<span class="bool-val">false</span>);
         a.push(<span class="bool-val">false</span>);
         a.push(<span class="bool-val">true</span>);

         <span class="kw">let </span>b = a.split_off(<span class="number">0</span>);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">0</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">4</span>);

         <span class="macro">assert!</span>(b.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>]));

         <span class="comment">// Split at last bit
         </span>a.truncate(<span class="number">0</span>);
         a.push(<span class="bool-val">true</span>);
         a.push(<span class="bool-val">false</span>);
         a.push(<span class="bool-val">false</span>);
         a.push(<span class="bool-val">true</span>);

         <span class="kw">let </span>b = a.split_off(<span class="number">4</span>);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">4</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">0</span>);

         <span class="macro">assert!</span>(a.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>]));

         <span class="comment">// Split at block boundary
         </span><span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10100000</span>, <span class="number">0b00010010</span>, <span class="number">0b10010010</span>, <span class="number">0b00110011</span>, <span class="number">0b11110011</span>]);

         <span class="kw">let </span>b = a.split_off(<span class="number">32</span>);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">32</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">8</span>);

         <span class="macro">assert!</span>(a.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));
         <span class="macro">assert!</span>(b.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>]));

         <span class="comment">// Don&#39;t split at block boundary
         </span><span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_bytes(<span class="kw-2">&amp;</span>[<span class="number">0b10100000</span>, <span class="number">0b00010010</span>, <span class="number">0b10010010</span>, <span class="number">0b00110011</span>,
                                          <span class="number">0b01101011</span>, <span class="number">0b10101101</span>]);

         <span class="kw">let </span>b = a.split_off(<span class="number">13</span>);

         <span class="macro">assert_eq!</span>(a.len(), <span class="number">13</span>);
         <span class="macro">assert_eq!</span>(b.len(), <span class="number">35</span>);

         <span class="macro">assert!</span>(a.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>]));
         <span class="macro">assert!</span>(b.eq_vec(<span class="kw-2">&amp;</span>[<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>,
                            <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>,  <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>,
                            <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>]));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_into_iter() {
         <span class="kw">let </span>bools = <span class="macro">vec!</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>];
         <span class="kw">let </span>bit_vec: BitVec = bools.iter().map(|n| <span class="kw-2">*</span>n).collect();
         <span class="kw">let </span><span class="kw-2">mut </span>iter = bit_vec.into_iter();
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">false</span>), iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, iter.next());

         <span class="kw">let </span>bit_vec: BitVec = bools.iter().map(|n| <span class="kw-2">*</span>n).collect();
         <span class="kw">let </span><span class="kw-2">mut </span>iter = bit_vec.into_iter();
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next_back());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next_back());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">false</span>), iter.next_back());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next_back());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, iter.next_back());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, iter.next_back());

         <span class="kw">let </span>bit_vec: BitVec = bools.iter().map(|n| <span class="kw-2">*</span>n).collect();
         <span class="kw">let </span><span class="kw-2">mut </span>iter = bit_vec.into_iter();
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next_back());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">false</span>), iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>), iter.next_back());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, iter.next());
         <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, iter.next_back());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>iter() {
         <span class="kw">let </span>b = BitVec::with_capacity(<span class="number">10</span>);
         <span class="kw">let </span>_a: Iter = b.iter();
     }

     <span class="attribute">#[cfg(feature=<span class="string">&quot;serde&quot;</span>)]
     #[test]
     </span><span class="kw">fn </span>test_serialization() {
         <span class="kw">let </span>bit_vec: BitVec = BitVec::new();
         <span class="kw">let </span>serialized = serde_json::to_string(<span class="kw-2">&amp;</span>bit_vec).unwrap();
         <span class="kw">let </span>unserialized: BitVec = serde_json::from_str(<span class="kw-2">&amp;</span>serialized).unwrap();
         <span class="macro">assert_eq!</span>(bit_vec, unserialized);

         <span class="kw">let </span>bools = <span class="macro">vec!</span>[<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>];
         <span class="kw">let </span>bit_vec: BitVec = bools.iter().map(|n| <span class="kw-2">*</span>n).collect();
         <span class="kw">let </span>serialized = serde_json::to_string(<span class="kw-2">&amp;</span>bit_vec).unwrap();
         <span class="kw">let </span>unserialized = serde_json::from_str(<span class="kw-2">&amp;</span>serialized).unwrap();
         <span class="macro">assert_eq!</span>(bit_vec, unserialized);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_unaligned_small_append() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_elem(<span class="number">8</span>, <span class="bool-val">false</span>);
         a.set(<span class="number">7</span>, <span class="bool-val">true</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">16</span>, <span class="bool-val">false</span>);
         b.set(<span class="number">14</span>, <span class="bool-val">true</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>c = BitVec::from_elem(<span class="number">8</span>, <span class="bool-val">false</span>);
         c.set(<span class="number">6</span>, <span class="bool-val">true</span>);
         c.set(<span class="number">7</span>, <span class="bool-val">true</span>);

         a.append(<span class="kw-2">&amp;mut </span>b);
         a.append(<span class="kw-2">&amp;mut </span>c);

         <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>[<span class="number">01</span>, <span class="number">00</span>, <span class="number">02</span>, <span class="number">03</span>][..], <span class="kw-2">&amp;*</span>a.to_bytes());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_unaligned_large_append() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_elem(<span class="number">48</span>, <span class="bool-val">false</span>);
         a.set(<span class="number">47</span>, <span class="bool-val">true</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">48</span>, <span class="bool-val">false</span>);
         b.set(<span class="number">46</span>, <span class="bool-val">true</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>c = BitVec::from_elem(<span class="number">48</span>, <span class="bool-val">false</span>);
         c.set(<span class="number">46</span>, <span class="bool-val">true</span>);
         c.set(<span class="number">47</span>, <span class="bool-val">true</span>);

         a.append(<span class="kw-2">&amp;mut </span>b);
         a.append(<span class="kw-2">&amp;mut </span>c);

         <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>[<span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x01</span>,
                      <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x02</span>,
                      <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x03</span>][..], <span class="kw-2">&amp;*</span>a.to_bytes());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bit_vec_append_aligned_to_unaligned() {
         <span class="kw">let </span><span class="kw-2">mut </span>a = BitVec::from_elem(<span class="number">2</span>, <span class="bool-val">true</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>b = BitVec::from_elem(<span class="number">32</span>, <span class="bool-val">false</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>c = BitVec::from_elem(<span class="number">8</span>, <span class="bool-val">true</span>);
         a.append(<span class="kw-2">&amp;mut </span>b);
         a.append(<span class="kw-2">&amp;mut </span>c);
         <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>[<span class="number">0xc0</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x3f</span>, <span class="number">0xc0</span>][..], <span class="kw-2">&amp;*</span>a.to_bytes());
     }
 }
 </code></pre></div>
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