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 </pre><pre class="rust"><code><span class="doccomment">//! [![github]](https://github.com/dtolnay/ghost)&amp;ensp;[![crates-io]](https://crates.io/crates/ghost)&amp;ensp;[![docs-rs]](https://docs.rs/ghost)
 //!
 //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&amp;labelColor=555555&amp;logo=github
 //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&amp;labelColor=555555&amp;logo=rust
 //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&amp;labelColor=555555&amp;logo=docs.rs
 //!
 //! &lt;br&gt;
 //!
 //! **Define your own PhantomData and similarly behaved unit types.**
 //!
 //! # Background
 //!
 //! [`PhantomData`] as defined by the Rust standard library is magical in that
 //! the same type is impossible to define in ordinary Rust code. It is defined
 //! in the standard library like this:
 //!
 //! [`PhantomData`]: https://doc.rust-lang.org/std/marker/struct.PhantomData.html
 //!
 //! ```
 //! # const IGNORE: &amp;str = stringify! {
 //! #[lang = &quot;phantom_data&quot;]
 //! pub struct PhantomData&lt;T: ?Sized&gt;;
 //! # };
 //! ```
 //!
 //! The `#[lang = &quot;...&quot;]` attribute indicates that this is a [lang item], a
 //! special case known to the compiler. It is the only type permitted to carry
 //! an unused type parameter.
 //!
 //! [lang item]: https://manishearth.github.io/blog/2017/01/11/rust-tidbits-what-is-a-lang-item/
 //!
 //! If we try to define an equivalent unit struct with type parameter, the
 //! compiler rejects that.
 //!
 //! ```compile_fail
 //! struct MyPhantom&lt;T: ?Sized&gt;;
 //! ```
 //!
 //! ```text
 //! error[E0392]: parameter `T` is never used
 //!  --&gt; src/main.rs:1:18
 //!   |
 //! 1 | struct MyPhantom&lt;T: ?Sized&gt;;
 //!   |                  ^ unused type parameter
 //!   |
 //!   = help: consider removing `T` or using a marker such as `std::marker::PhantomData`
 //! ```
 //!
 //! This crate provides a `#[phantom]` attribute that makes it possible to
 //! define unit structs with generic parameters.
 //!
 //! # Examples
 //!
 //! ```
 //! use ghost::phantom;
 //!
 //! #[phantom]
 //! struct MyPhantom&lt;T: ?Sized&gt;;
 //!
 //! fn main() {
 //!     // Proof that MyPhantom behaves like PhantomData.
 //!     let _: MyPhantom&lt;u8&gt; = MyPhantom::&lt;u8&gt;;
 //!     assert_eq!(0, std::mem::size_of::&lt;MyPhantom&lt;u8&gt;&gt;());
 //! }
 //!
 //! // Proof that MyPhantom is not just a re-export of PhantomData.
 //! // If it were a re-export, these would be conflicting impls.
 //! trait Trait {}
 //! impl&lt;T&gt; Trait for std::marker::PhantomData&lt;T&gt; {}
 //! impl&lt;T&gt; Trait for MyPhantom&lt;T&gt; {}
 //!
 //! // Proof that MyPhantom is local to the current crate.
 //! impl&lt;T&gt; MyPhantom&lt;T&gt; {
 //! }
 //! ```
 //!
 //! The implementation accepts where-clauses, lifetimes, multiple generic
 //! parameters, and derives. Here is a contrived invocation that demonstrates
 //! everything at once:
 //!
 //! ```
 //! use ghost::phantom;
 //!
 //! #[phantom]
 //! #[derive(Copy, Clone, Default, Hash, PartialOrd, Ord, PartialEq, Eq, Debug)]
 //! struct Crazy&lt;&#39;a, V: &#39;a, T&gt; where &amp;&#39;a V: IntoIterator&lt;Item = T&gt;;
 //!
 //! fn main() {
 //!     let _ = Crazy::&lt;&#39;static, Vec&lt;String&gt;, &amp;&#39;static String&gt;;
 //!
 //!     // Lifetime elision.
 //!     let crazy = Crazy::&lt;Vec&lt;String&gt;, &amp;String&gt;;
 //!     println!(&quot;{:?}&quot;, crazy);
 //! }
 //! ```
 //!
 //! # Variance
 //!
 //! The `#[phantom]` attribute accepts attributes on individual generic
 //! parameters (both lifetime and type parameters) to make them contravariant or
 //! invariant. The default is covariance.
 //!
 //! - `#[contra]` — contravariant generic parameter
 //! - `#[invariant]` — invariant generic parameter
 //!
 //! The implications of variance are explained in more detail by the [Subtyping
 //! chapter] of the Rustonomicon.
 //!
 //! [Subtyping chapter]: https://doc.rust-lang.org/nomicon/subtyping.html
 //!
 //! ```
 //! use ghost::phantom;
 //!
 //! #[phantom]
 //! struct ContravariantLifetime&lt;#[contra] &#39;a&gt;;
 //!
 //! fn f&lt;&#39;a&gt;(arg: ContravariantLifetime&lt;&#39;a&gt;) -&gt; ContravariantLifetime&lt;&#39;static&gt; {
 //!     // This coercion is only legal because the lifetime parameter is
 //!     // contravariant. If it were covariant (the default) or invariant,
 //!     // this would not compile.
 //!     arg
 //! }
 //!
 //! #[phantom]
 //! struct Demo&lt;A, #[contra] B, #[invariant] C&gt;;
 //! #
 //! # fn main() {}
 //! ```
 //!
 //! # Use cases
 //!
 //! Entirely up to your imagination. Just to name one, how about a typed
 //! registry library that admits the following syntax for iterating over values
 //! registered of a particular type:
 //!
 //! ```no_run
 //! # use ghost::phantom;
 //! #
 //! # #[phantom]
 //! # struct Registry&lt;T&gt;;
 //! #
 //! # impl&lt;T&gt; IntoIterator for Registry&lt;T&gt; {
 //! #     type Item = T;
 //! #     type IntoIter = Iter&lt;T&gt;;
 //! #     fn into_iter(self) -&gt; Self::IntoIter {
 //! #         unimplemented!()
 //! #     }
 //! # }
 //! #
 //! # struct Iter&lt;T&gt;(T);
 //! #
 //! # impl&lt;T&gt; Iterator for Iter&lt;T&gt; {
 //! #     type Item = T;
 //! #     fn next(&amp;mut self) -&gt; Option&lt;Self::Item&gt; {
 //! #         unimplemented!()
 //! #     }
 //! # }
 //! #
 //! # struct Flag;
 //! #
 //! # fn main() {
 //! for flag in Registry::&lt;Flag&gt; {
 //!     /* ... */
 //! }
 //! # }
 //! ```

 </span><span class="attribute">#![doc(html_root_url = <span class="string">&quot;https://docs.rs/ghost/0.1.9&quot;</span>)]
 #![allow(
     clippy::doc_markdown,
     <span class="comment">// https://github.com/rust-lang/rust-clippy/issues/8538
     </span>clippy::iter_with_drain,
     clippy::needless_doctest_main,
     clippy::needless_pass_by_value,
     clippy::too_many_lines
 )]

 </span><span class="kw">extern crate </span>proc_macro;

 <span class="kw">mod </span>derive;
 <span class="kw">mod </span>parse;
 <span class="kw">mod </span>variance;
 <span class="kw">mod </span>visibility;

 <span class="kw">use </span>proc_macro::TokenStream;
 <span class="kw">use </span>proc_macro2::{Ident, Span};
 <span class="kw">use </span>quote::quote;
 <span class="kw">use </span>syn::parse::Nothing;
 <span class="kw">use </span>syn::{parse_macro_input, Error, GenericParam, Token};

 <span class="kw">use </span><span class="kw">crate</span>::parse::UnitStruct;

 <span class="doccomment">/// Define your own PhantomData and similarly behaved unit types.
 ///
 /// Please refer to the [crate level documentation](index.html) for explanation
 /// and examples.
 </span><span class="attribute">#[proc_macro_attribute]
 </span><span class="kw">pub fn </span>phantom(args: TokenStream, input: TokenStream) -&gt; TokenStream {
     <span class="macro">parse_macro_input!</span>(args <span class="kw">as </span>Nothing);
     <span class="kw">let </span>input = <span class="macro">parse_macro_input!</span>(input <span class="kw">as </span>UnitStruct);

     <span class="kw">let </span>ident = <span class="kw-2">&amp;</span>input.ident;
     <span class="kw">let </span>call_site = Span::call_site();
     <span class="kw">let </span>void_namespace = Ident::new(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;__void_{}&quot;</span>, ident), call_site);
     <span class="kw">let </span>value_namespace = Ident::new(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;__value_{}&quot;</span>, ident), call_site);

     <span class="kw">let </span>vis = <span class="kw-2">&amp;</span>input.vis;
     <span class="kw">let </span>vis_super = visibility::vis_super(vis);

     <span class="kw">let </span>(derives, attrs) = <span class="kw">match </span>derive::expand(<span class="kw-2">&amp;</span>input.attrs, <span class="kw-2">&amp;</span>input) {
         <span class="prelude-val">Ok</span>(split) =&gt; split,
         <span class="prelude-val">Err</span>(err) =&gt; <span class="kw">return </span>err.to_compile_error().into(),
     };

     <span class="kw">let </span>void = Ident::new(
         <span class="kw">if </span>ident == <span class="string">&quot;Void&quot; </span>{ <span class="string">&quot;__Void&quot; </span>} <span class="kw">else </span>{ <span class="string">&quot;Void&quot; </span>},
         Span::call_site(),
     );

     <span class="kw">let </span>type_param = Ident::new(
         <span class="kw">if </span>ident == <span class="string">&quot;TypeParam&quot; </span>{
             <span class="string">&quot;__TypeParam&quot;
         </span>} <span class="kw">else </span>{
             <span class="string">&quot;TypeParam&quot;
         </span>},
         Span::call_site(),
     );

     <span class="kw">let </span><span class="kw-2">mut </span>generics = input.generics;
     <span class="kw">let </span>where_clause = generics.where_clause.take();
     <span class="kw">let </span><span class="kw-2">mut </span>impl_generics = Vec::new();
     <span class="kw">let </span><span class="kw-2">mut </span>ty_generics = Vec::new();
     <span class="kw">let </span><span class="kw-2">mut </span>phantoms = Vec::new();
     <span class="kw">for </span>param <span class="kw">in </span><span class="kw-2">&amp;mut </span>generics.params {
         <span class="kw">match </span>param {
             GenericParam::Type(param) =&gt; {
                 <span class="kw">let </span>ident = <span class="kw-2">&amp;</span>param.ident;
                 <span class="kw">let </span>elem = <span class="macro">quote!</span>(#ident);
                 impl_generics.push(<span class="macro">quote!</span>(#ident: <span class="question-mark">?</span>::core::marker::Sized));
                 ty_generics.push(<span class="macro">quote!</span>(#ident));
                 phantoms.push(variance::apply(param, elem, <span class="kw-2">&amp;</span>type_param));
             }
             GenericParam::Lifetime(param) =&gt; {
                 <span class="kw">let </span>lifetime = <span class="kw-2">&amp;</span>param.lifetime;
                 <span class="kw">let </span>elem = <span class="macro">quote!</span>(<span class="kw-2">&amp;</span>#lifetime ());
                 impl_generics.push(<span class="macro">quote!</span>(#lifetime));
                 ty_generics.push(<span class="macro">quote!</span>(#lifetime));
                 phantoms.push(variance::apply(param, elem, <span class="kw-2">&amp;</span>type_param));
             }
             GenericParam::Const(param) =&gt; {
                 <span class="kw">let </span>msg = <span class="string">&quot;const generics are not supported&quot;</span>;
                 <span class="kw">let </span>err = Error::new_spanned(param, msg);
                 <span class="kw">return </span>err.to_compile_error().into();
             }
         }
     }

     <span class="kw">let </span>impl_generics = <span class="kw-2">&amp;</span>impl_generics;
     <span class="kw">let </span>ty_generics = <span class="kw-2">&amp;</span>ty_generics;
     <span class="kw">let </span>enum_token = <span class="macro">Token!</span>[<span class="kw">enum</span>](input.struct_token.span);
     <span class="kw">let </span>struct_token = input.struct_token;

     TokenStream::from(<span class="macro">quote! </span>{
         <span class="attribute">#[cfg(not(doc))]
         </span><span class="kw">mod </span>#void_namespace {
             <span class="kw">enum </span>#void {}
             <span class="kw">impl </span>::core::marker::Copy <span class="kw">for </span>#void {}
             <span class="attribute">#[allow(clippy::expl_impl_clone_on_copy)]
             </span><span class="kw">impl </span>::core::clone::Clone <span class="kw">for </span>#void {
                 <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="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{}
                 }
             }

             <span class="attribute">#[repr(C, packed)]
             </span><span class="kw">struct </span>#type_param&lt;T: <span class="question-mark">?</span>::core::marker::Sized&gt;([<span class="kw-2">*const </span>T; <span class="number">0</span>]);
             <span class="kw">impl</span>&lt;T: <span class="question-mark">?</span>::core::marker::Sized&gt; ::core::marker::Copy <span class="kw">for </span>#type_param&lt;T&gt; {}
             <span class="attribute">#[allow(clippy::expl_impl_clone_on_copy)]
             </span><span class="kw">impl</span>&lt;T: <span class="question-mark">?</span>::core::marker::Sized&gt; ::core::clone::Clone <span class="kw">for </span>#type_param&lt;T&gt; {
                 <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="kw-2">*</span><span class="self">self
                 </span>}
             }
             <span class="kw">unsafe impl</span>&lt;T: <span class="question-mark">?</span>::core::marker::Sized + ::core::marker::Send&gt; ::core::marker::Send <span class="kw">for </span>#type_param&lt;T&gt; {}
             <span class="kw">unsafe impl</span>&lt;T: <span class="question-mark">?</span>::core::marker::Sized + ::core::marker::Sync&gt; ::core::marker::Sync <span class="kw">for </span>#type_param&lt;T&gt; {}

             <span class="attribute">#[allow(non_camel_case_types)]
             </span>#vis_super <span class="kw">struct </span>#ident &lt;#(#impl_generics),<span class="kw-2">*</span>&gt; (
                 #(
                     <span class="self">self</span>::#type_param&lt;#phantoms&gt;,
                 )*
                 <span class="self">self</span>::#void,
             );

             <span class="kw">impl </span>&lt;#(#impl_generics),<span class="kw-2">*</span>&gt; ::core::marker::Copy
             <span class="kw">for </span>#ident &lt;#(#ty_generics),<span class="kw-2">*</span>&gt; {}

             <span class="attribute">#[allow(clippy::expl_impl_clone_on_copy)]
             </span><span class="kw">impl </span>&lt;#(#impl_generics),<span class="kw-2">*</span>&gt; ::core::clone::Clone
             <span class="kw">for </span>#ident &lt;#(#ty_generics),<span class="kw-2">*</span>&gt; {
                 <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="kw-2">*</span><span class="self">self
                 </span>}
             }
         }

         <span class="attribute">#[cfg(not(doc))]
         </span><span class="kw">mod </span>#value_namespace {
             #vis_super <span class="kw">use super</span>::#ident::#ident;
         }

         <span class="attribute">#[cfg(not(doc))]
         </span>#(#attrs)*
         #vis #enum_token #ident #generics #where_clause {
             __Phantom(#void_namespace::#ident &lt;#(#ty_generics),<span class="kw-2">*</span>&gt;),
             #ident,
         }

         <span class="attribute">#[cfg(not(doc))]
         #[doc(hidden)]
         </span>#vis <span class="kw">use </span><span class="self">self</span>::#value_namespace::<span class="kw-2">*</span>;

         <span class="attribute">#[cfg(doc)]
         </span>#(#attrs)*
         #vis #struct_token #ident #generics #where_clause;

         #derives
     })
 }
 </code></pre></div>
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