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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/pin-project-internal-1.1.0/src/pin_project/derive.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>derive.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="../../../pin_project_internal/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="../../../pin_project_internal/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="kw">use </span>proc_macro2::{Delimiter, Group, Span, TokenStream};
 <span class="kw">use </span>quote::{format_ident, quote, quote_spanned, ToTokens};
 <span class="kw">use </span>syn::{
     parse_quote, punctuated::Punctuated, token, visit_mut::VisitMut, Attribute, Data, DataEnum,
     DeriveInput, Error, Field, Fields, FieldsNamed, FieldsUnnamed, Generics, Ident, Index,
     Lifetime, LifetimeParam, Meta, <span class="prelude-ty">Result</span>, Token, Type, Variant, Visibility, WhereClause,
 };

 <span class="kw">use super</span>::{
     args::{parse_args, Args, ProjReplace, UnpinImpl},
     PIN,
 };
 <span class="kw">use </span><span class="kw">crate</span>::utils::{
     determine_lifetime_name, determine_visibility, insert_lifetime_and_bound, ReplaceReceiver,
     SliceExt, Variants,
 };

 <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>parse_derive(input: TokenStream) -&gt; <span class="prelude-ty">Result</span>&lt;TokenStream&gt; {
     <span class="kw">let </span><span class="kw-2">mut </span>input: DeriveInput = syn::parse2(input)<span class="question-mark">?</span>;

     <span class="kw">let </span><span class="kw-2">mut </span>cx;
     <span class="kw">let </span><span class="kw-2">mut </span>generate = GenerateTokens::default();

     <span class="kw">let </span>ident = <span class="kw-2">&amp;</span>input.ident;
     <span class="kw">let </span>ty_generics = input.generics.split_for_impl().<span class="number">1</span>;
     <span class="kw">let </span>self_ty = <span class="macro">parse_quote!</span>(#ident #ty_generics);
     <span class="kw">let </span><span class="kw-2">mut </span>visitor = ReplaceReceiver(<span class="kw-2">&amp;</span>self_ty);
     visitor.visit_generics_mut(<span class="kw-2">&amp;mut </span>input.generics);
     visitor.visit_data_mut(<span class="kw-2">&amp;mut </span>input.data);

     <span class="kw">match </span><span class="kw-2">&amp;</span>input.data {
         Data::Struct(data) =&gt; {
             cx = Context::new(<span class="kw-2">&amp;</span>input.attrs, <span class="kw-2">&amp;</span>input.vis, ident, <span class="kw-2">&amp;mut </span>input.generics, Struct)<span class="question-mark">?</span>;
             parse_struct(<span class="kw-2">&amp;mut </span>cx, <span class="kw-2">&amp;</span>data.fields, <span class="kw-2">&amp;mut </span>generate)<span class="question-mark">?</span>;
         }
         Data::Enum(data) =&gt; {
             cx = Context::new(<span class="kw-2">&amp;</span>input.attrs, <span class="kw-2">&amp;</span>input.vis, ident, <span class="kw-2">&amp;mut </span>input.generics, Enum)<span class="question-mark">?</span>;
             parse_enum(<span class="kw-2">&amp;mut </span>cx, data, <span class="kw-2">&amp;mut </span>generate)<span class="question-mark">?</span>;
         }
         Data::Union(<span class="kw">_</span>) =&gt; {
             <span class="macro">bail!</span>(input, <span class="string">&quot;#[pin_project] attribute may only be used on structs or enums&quot;</span>);
         }
     }

     <span class="prelude-val">Ok</span>(generate.into_tokens(<span class="kw-2">&amp;</span>cx))
 }

 <span class="attribute">#[derive(Default)]
 </span><span class="kw">struct </span>GenerateTokens {
     exposed: TokenStream,
     scoped: TokenStream,
 }

 <span class="kw">impl </span>GenerateTokens {
     <span class="kw">fn </span>extend(<span class="kw-2">&amp;mut </span><span class="self">self</span>, expose: bool, tokens: TokenStream) {
         <span class="kw">if </span>expose {
             <span class="self">self</span>.exposed.extend(tokens);
         } <span class="kw">else </span>{
             <span class="self">self</span>.scoped.extend(tokens);
         }
     }

     <span class="kw">fn </span>into_tokens(<span class="self">self</span>, cx: <span class="kw-2">&amp;</span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; TokenStream {
         <span class="kw">let </span><span class="kw-2">mut </span>tokens = <span class="self">self</span>.exposed;
         <span class="kw">let </span>scoped = <span class="self">self</span>.scoped;

         <span class="kw">let </span>unpin_impl = make_unpin_impl(cx);
         <span class="kw">let </span>drop_impl = make_drop_impl(cx);
         <span class="kw">let </span>allowed_lints = global_allowed_lints();

         tokens.extend(<span class="macro">quote! </span>{
             <span class="comment">// All items except projected types are generated inside a `const` scope.
             // This makes it impossible for user code to refer to these types.
             // However, this prevents Rustdoc from displaying docs for any
             // of our types. In particular, users cannot see the
             // automatically generated `Unpin` impl for the &#39;__UnpinStruct&#39; types
             //
             // Previously, we provided a flag to correctly document the
             // automatically generated `Unpin` impl by using def-site hygiene,
             // but it is now removed.
             //
             // Refs:
             // - https://github.com/rust-lang/rust/issues/63281
             // - https://github.com/taiki-e/pin-project/pull/53#issuecomment-525906867
             // - https://github.com/taiki-e/pin-project/pull/70
             </span>#allowed_lints
             <span class="attribute">#[allow(unused_qualifications)]
             #[allow(clippy::semicolon_if_nothing_returned)]
             #[allow(clippy::use_self)]
             #[allow(clippy::used_underscore_binding)]
             </span><span class="kw">const _</span>: () = {
                 <span class="attribute">#[allow(unused_extern_crates)]
                 </span><span class="kw">extern crate </span>pin_project <span class="kw">as </span>_pin_project;
                 #scoped
                 #unpin_impl
                 #drop_impl
             };
         });
         tokens
     }
 }

 <span class="doccomment">/// Returns attributes that should be applied to all generated code.
 </span><span class="kw">fn </span>global_allowed_lints() -&gt; TokenStream {
     <span class="macro">quote! </span>{
         <span class="attribute">#[allow(box_pointers)] </span><span class="comment">// This lint warns use of the `Box` type.
         </span><span class="attribute">#[allow(deprecated)]
         #[allow(explicit_outlives_requirements)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/60993
         </span><span class="attribute">#[allow(single_use_lifetimes)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/55058
         </span><span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// This lint warns `pub` field in private struct.
         </span><span class="attribute">#[allow(unused_tuple_struct_fields)]
         </span><span class="comment">// This lint warns of `clippy::*` generated by external macros.
         // We allow this lint for compatibility with older compilers.
         </span><span class="attribute">#[allow(clippy::unknown_clippy_lints)]
         #[allow(clippy::pattern_type_mismatch)]
         #[allow(clippy::redundant_pub_crate)] </span><span class="comment">// This lint warns `pub(crate)` field in private struct.
         </span><span class="attribute">#[allow(clippy::type_repetition_in_bounds)] </span><span class="comment">// https://github.com/rust-lang/rust-clippy/issues/4326
     </span>}
 }

 <span class="doccomment">/// Returns attributes used on projected types.
 </span><span class="kw">fn </span>proj_allowed_lints(cx: <span class="kw-2">&amp;</span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; (TokenStream, TokenStream, TokenStream) {
     <span class="kw">let </span>large_enum_variant = <span class="kw">if </span>cx.kind == Enum {
         <span class="prelude-val">Some</span>(<span class="macro">quote! </span>{
             <span class="attribute">#[allow(variant_size_differences)]
             #[allow(clippy::large_enum_variant)]
         </span>})
     } <span class="kw">else </span>{
         <span class="prelude-val">None
     </span>};
     <span class="kw">let </span>global_allowed_lints = global_allowed_lints();
     <span class="kw">let </span>proj_mut_allowed_lints = <span class="kw">if </span>cx.project { <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>global_allowed_lints) } <span class="kw">else </span>{ <span class="prelude-val">None </span>};
     <span class="kw">let </span>proj_mut = <span class="macro">quote! </span>{
         #proj_mut_allowed_lints
         <span class="attribute">#[allow(dead_code)] </span><span class="comment">// This lint warns unused fields/variants.
         </span><span class="attribute">#[allow(clippy::mut_mut)] </span><span class="comment">// This lint warns `&amp;mut &amp;mut &lt;ty&gt;`.
     </span>};
     <span class="kw">let </span>proj_ref_allowed_lints = <span class="kw">if </span>cx.project_ref { <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>global_allowed_lints) } <span class="kw">else </span>{ <span class="prelude-val">None </span>};
     <span class="kw">let </span>proj_ref = <span class="macro">quote! </span>{
         #proj_ref_allowed_lints
         <span class="attribute">#[allow(dead_code)] </span><span class="comment">// This lint warns unused fields/variants.
         </span><span class="attribute">#[allow(clippy::ref_option_ref)] </span><span class="comment">// This lint warns `&amp;Option&lt;&amp;&lt;ty&gt;&gt;`.
     </span>};
     <span class="kw">let </span>proj_own_allowed_lints =
         <span class="kw">if </span>cx.project_replace.ident().is_some() { <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>global_allowed_lints) } <span class="kw">else </span>{ <span class="prelude-val">None </span>};
     <span class="kw">let </span>proj_own = <span class="macro">quote! </span>{
         #proj_own_allowed_lints
         <span class="attribute">#[allow(dead_code)] </span><span class="comment">// This lint warns unused fields/variants.
         </span>#large_enum_variant
     };
     (proj_mut, proj_ref, proj_own)
 }

 <span class="kw">struct </span>Context&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// The original type.
     </span>orig: OriginalType&lt;<span class="lifetime">&#39;a</span>&gt;,
     <span class="doccomment">/// The projected types.
     </span>proj: ProjectedType,
     <span class="doccomment">/// Types of the pinned fields.
     </span>pinned_fields: Vec&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Type&gt;,
     <span class="doccomment">/// Kind of the original type: struct or enum
     </span>kind: TypeKind,

     <span class="doccomment">/// `PinnedDrop` argument.
     </span>pinned_drop: <span class="prelude-ty">Option</span>&lt;Span&gt;,
     <span class="doccomment">/// `UnsafeUnpin` or `!Unpin` argument.
     </span>unpin_impl: UnpinImpl,
     <span class="doccomment">/// `project` argument.
     </span>project: bool,
     <span class="doccomment">/// `project_ref` argument.
     </span>project_ref: bool,
     <span class="doccomment">/// `project_replace [= &lt;ident&gt;]` argument.
     </span>project_replace: ProjReplace,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Context&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>new(
         attrs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[Attribute],
         vis: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Visibility,
         ident: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Ident,
         generics: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>Generics,
         kind: TypeKind,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>&gt; {
         <span class="kw">let </span>Args { pinned_drop, unpin_impl, project, project_ref, project_replace } =
             parse_args(attrs)<span class="question-mark">?</span>;

         <span class="kw">if let </span><span class="prelude-val">Some</span>(name) = [project.as_ref(), project_ref.as_ref(), project_replace.ident()]
             .iter()
             .filter_map(Option::as_ref)
             .find(|name| <span class="kw-2">**</span>name == ident)
         {
             <span class="macro">bail!</span>(name, <span class="string">&quot;name `{}` is the same as the original type name&quot;</span>, name);
         }

         <span class="kw">let </span><span class="kw-2">mut </span>lifetime_name = String::from(<span class="string">&quot;&#39;pin&quot;</span>);
         determine_lifetime_name(<span class="kw-2">&amp;mut </span>lifetime_name, generics);
         <span class="kw">let </span>lifetime = Lifetime::new(<span class="kw-2">&amp;</span>lifetime_name, Span::call_site());

         <span class="kw">let </span>ty_generics = generics.split_for_impl().<span class="number">1</span>;
         <span class="kw">let </span>ty_generics_as_generics = <span class="macro">parse_quote!</span>(#ty_generics);
         <span class="kw">let </span><span class="kw-2">mut </span>proj_generics = generics.clone();
         <span class="kw">let </span>pred = insert_lifetime_and_bound(
             <span class="kw-2">&amp;mut </span>proj_generics,
             lifetime.clone(),
             <span class="kw-2">&amp;</span>ty_generics_as_generics,
             ident,
         );
         <span class="kw">let </span><span class="kw-2">mut </span>where_clause = generics.make_where_clause().clone();
         where_clause.predicates.push(pred);

         <span class="kw">let </span>own_ident = project_replace
             .ident()
             .cloned()
             .unwrap_or_else(|| <span class="macro">format_ident!</span>(<span class="string">&quot;__{}ProjectionOwned&quot;</span>, ident));

         <span class="prelude-val">Ok</span>(<span class="self">Self </span>{
             kind,
             pinned_drop,
             unpin_impl,
             project: project.is_some(),
             project_ref: project_ref.is_some(),
             project_replace,
             proj: ProjectedType {
                 vis: determine_visibility(vis),
                 mut_ident: project.unwrap_or_else(|| <span class="macro">format_ident!</span>(<span class="string">&quot;__{}Projection&quot;</span>, ident)),
                 ref_ident: project_ref.unwrap_or_else(|| <span class="macro">format_ident!</span>(<span class="string">&quot;__{}ProjectionRef&quot;</span>, ident)),
                 own_ident,
                 lifetime,
                 generics: proj_generics,
                 where_clause,
             },
             orig: OriginalType { attrs, vis, ident, generics },
             pinned_fields: Vec::new(),
         })
     }
 }

 <span class="attribute">#[derive(Copy, Clone, PartialEq)]
 </span><span class="kw">enum </span>TypeKind {
     Enum,
     Struct,
 }

 <span class="kw">use </span>TypeKind::{Enum, Struct};

 <span class="kw">struct </span>OriginalType&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Attributes of the original type.
     </span>attrs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[Attribute],
     <span class="doccomment">/// Visibility of the original type.
     </span>vis: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Visibility,
     <span class="doccomment">/// Name of the original type.
     </span>ident: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Ident,
     <span class="doccomment">/// Generics of the original type.
     </span>generics: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Generics,
 }

 <span class="kw">struct </span>ProjectedType {
     <span class="doccomment">/// Visibility of the projected types.
     </span>vis: Visibility,
     <span class="doccomment">/// Name of the projected type returned by `project` method.
     </span>mut_ident: Ident,
     <span class="doccomment">/// Name of the projected type returned by `project_ref` method.
     </span>ref_ident: Ident,
     <span class="doccomment">/// Name of the projected type returned by `project_replace` method.
     </span>own_ident: Ident,
     <span class="doccomment">/// Lifetime on the generated projected types.
     </span>lifetime: Lifetime,
     <span class="doccomment">/// Generics of the projected types.
     </span>generics: Generics,
     <span class="doccomment">/// `where` clause of the projected types. This has an additional
     /// bound generated by `insert_lifetime_and_bound`
     </span>where_clause: WhereClause,
 }

 <span class="kw">struct </span>ProjectedVariants {
     proj_variants: TokenStream,
     proj_ref_variants: TokenStream,
     proj_own_variants: TokenStream,
     proj_arms: TokenStream,
     proj_ref_arms: TokenStream,
     proj_own_arms: TokenStream,
 }

 <span class="attribute">#[derive(Default)]
 </span><span class="kw">struct </span>ProjectedFields {
     proj_pat: TokenStream,
     proj_body: TokenStream,
     proj_own_body: TokenStream,
     proj_fields: TokenStream,
     proj_ref_fields: TokenStream,
     proj_own_fields: TokenStream,
 }

 <span class="kw">fn </span>validate_struct(ident: <span class="kw-2">&amp;</span>Ident, fields: <span class="kw-2">&amp;</span>Fields) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
     <span class="kw">if </span>fields.is_empty() {
         <span class="kw">let </span>msg = <span class="string">&quot;#[pin_project] attribute may not be used on structs with zero fields&quot;</span>;
         <span class="kw">if let </span>Fields::Unit = fields {
             <span class="macro">bail!</span>(ident, msg)
         }
         <span class="macro">bail!</span>(fields, msg)
     }
     <span class="prelude-val">Ok</span>(())
 }

 <span class="kw">fn </span>validate_enum(brace_token: token::Brace, variants: <span class="kw-2">&amp;</span>Variants) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
     <span class="kw">if </span>variants.is_empty() {
         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new(
             brace_token.span.join(),
             <span class="string">&quot;#[pin_project] attribute may not be used on enums without variants&quot;</span>,
         ));
     }
     <span class="kw">let </span>has_field = variants.iter().try_fold(<span class="bool-val">false</span>, |has_field, v| {
         <span class="kw">if let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, e)) = <span class="kw-2">&amp;</span>v.discriminant {
             <span class="macro">bail!</span>(e, <span class="string">&quot;#[pin_project] attribute may not be used on enums with discriminants&quot;</span>);
         } <span class="kw">else if let </span><span class="prelude-val">Some</span>(attr) = v.attrs.find(PIN) {
             <span class="macro">bail!</span>(attr, <span class="string">&quot;#[pin] attribute may only be used on fields of structs or variants&quot;</span>);
         } <span class="kw">else if </span>v.fields.is_empty() {
             <span class="prelude-val">Ok</span>(has_field)
         } <span class="kw">else </span>{
             <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>)
         }
     })<span class="question-mark">?</span>;
     <span class="kw">if </span>has_field {
         <span class="prelude-val">Ok</span>(())
     } <span class="kw">else </span>{
         <span class="macro">bail!</span>(variants, <span class="string">&quot;#[pin_project] attribute may not be used on enums with zero fields&quot;</span>);
     }
 }

 <span class="kw">fn </span>parse_struct&lt;<span class="lifetime">&#39;a</span>&gt;(
     cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;a</span>&gt;,
     fields: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Fields,
     generate: <span class="kw-2">&amp;mut </span>GenerateTokens,
 ) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
     <span class="comment">// Do this first for a better error message.
     </span><span class="kw">let </span>packed_check = ensure_not_packed(<span class="kw-2">&amp;</span>cx.orig, <span class="prelude-val">Some</span>(fields))<span class="question-mark">?</span>;

     validate_struct(cx.orig.ident, fields)<span class="question-mark">?</span>;

     <span class="kw">let </span>ProjectedFields {
         proj_pat,
         proj_body,
         proj_fields,
         proj_ref_fields,
         proj_own_fields,
         proj_own_body,
     } = <span class="kw">match </span>fields {
         Fields::Named(<span class="kw">_</span>) =&gt; visit_fields(cx, <span class="prelude-val">None</span>, fields, Delimiter::Brace)<span class="question-mark">?</span>,
         Fields::Unnamed(<span class="kw">_</span>) =&gt; visit_fields(cx, <span class="prelude-val">None</span>, fields, Delimiter::Parenthesis)<span class="question-mark">?</span>,
         Fields::Unit =&gt; <span class="macro">unreachable!</span>(),
     };

     <span class="kw">let </span>proj_ident = <span class="kw-2">&amp;</span>cx.proj.mut_ident;
     <span class="kw">let </span>proj_ref_ident = <span class="kw-2">&amp;</span>cx.proj.ref_ident;
     <span class="kw">let </span>proj_own_ident = <span class="kw-2">&amp;</span>cx.proj.own_ident;
     <span class="kw">let </span>vis = <span class="kw-2">&amp;</span>cx.proj.vis;
     <span class="kw">let </span><span class="kw-2">mut </span>orig_generics = cx.orig.generics.clone();
     <span class="kw">let </span>orig_where_clause = orig_generics.where_clause.take();
     <span class="kw">let </span>proj_generics = <span class="kw-2">&amp;</span>cx.proj.generics;
     <span class="kw">let </span>proj_where_clause = <span class="kw-2">&amp;</span>cx.proj.where_clause;

     <span class="comment">// For tuple structs, we need to generate `(T1, T2) where Foo: Bar`
     // For non-tuple structs, we need to generate `where Foo: Bar { field1: T }`
     </span><span class="kw">let </span>(where_clause_fields, where_clause_ref_fields, where_clause_own_fields) = <span class="kw">match </span>fields {
         Fields::Named(<span class="kw">_</span>) =&gt; (
             <span class="macro">quote!</span>(#proj_where_clause #proj_fields),
             <span class="macro">quote!</span>(#proj_where_clause #proj_ref_fields),
             <span class="macro">quote!</span>(#orig_where_clause #proj_own_fields),
         ),
         Fields::Unnamed(<span class="kw">_</span>) =&gt; (
             <span class="macro">quote!</span>(#proj_fields #proj_where_clause;),
             <span class="macro">quote!</span>(#proj_ref_fields #proj_where_clause;),
             <span class="macro">quote!</span>(#proj_own_fields #orig_where_clause;),
         ),
         Fields::Unit =&gt; <span class="macro">unreachable!</span>(),
     };

     <span class="kw">let </span>(proj_attrs, proj_ref_attrs, proj_own_attrs) = proj_allowed_lints(cx);
     generate.extend(cx.project, <span class="macro">quote! </span>{
         #proj_attrs
         #vis <span class="kw">struct </span>#proj_ident #proj_generics #where_clause_fields
     });
     generate.extend(cx.project_ref, <span class="macro">quote! </span>{
         #proj_ref_attrs
         #vis <span class="kw">struct </span>#proj_ref_ident #proj_generics #where_clause_ref_fields
     });
     <span class="kw">if </span>cx.project_replace.span().is_some() {
         generate.extend(cx.project_replace.ident().is_some(), <span class="macro">quote! </span>{
             #proj_own_attrs
             #vis <span class="kw">struct </span>#proj_own_ident #orig_generics #where_clause_own_fields
         });
     }

     <span class="kw">let </span>proj_mut_body = <span class="macro">quote! </span>{
         <span class="kw">let </span><span class="self">Self </span>#proj_pat = <span class="self">self</span>.get_unchecked_mut();
         #proj_ident #proj_body
     };
     <span class="kw">let </span>proj_ref_body = <span class="macro">quote! </span>{
         <span class="kw">let </span><span class="self">Self </span>#proj_pat = <span class="self">self</span>.get_ref();
         #proj_ref_ident #proj_body
     };
     <span class="kw">let </span>proj_own_body = <span class="macro">quote! </span>{
         <span class="kw">let </span><span class="self">Self </span>#proj_pat = <span class="kw-2">&amp;mut *</span>__self_ptr;
         #proj_own_body
     };
     generate.extend(<span class="bool-val">false</span>, make_proj_impl(cx, <span class="kw-2">&amp;</span>proj_mut_body, <span class="kw-2">&amp;</span>proj_ref_body, <span class="kw-2">&amp;</span>proj_own_body));

     generate.extend(<span class="bool-val">false</span>, packed_check);
     <span class="prelude-val">Ok</span>(())
 }

 <span class="kw">fn </span>parse_enum&lt;<span class="lifetime">&#39;a</span>&gt;(
     cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;a</span>&gt;,
     DataEnum { brace_token, variants, .. }: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>DataEnum,
     generate: <span class="kw-2">&amp;mut </span>GenerateTokens,
 ) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
     <span class="kw">if let </span>ProjReplace::Unnamed { span } = <span class="kw-2">&amp;</span>cx.project_replace {
         <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new(
             <span class="kw-2">*</span>span,
             <span class="string">&quot;`project_replace` argument requires a value when used on enums&quot;</span>,
         ));
     }

     <span class="comment">// #[repr(packed)] cannot be apply on enums and will be rejected by rustc.
     // However, we should not rely on the behavior of rustc that rejects this.
     // https://github.com/taiki-e/pin-project/pull/324#discussion_r612388001
     //
     // Do this first for a better error message.
     </span>ensure_not_packed(<span class="kw-2">&amp;</span>cx.orig, <span class="prelude-val">None</span>)<span class="question-mark">?</span>;

     validate_enum(<span class="kw-2">*</span>brace_token, variants)<span class="question-mark">?</span>;

     <span class="kw">let </span>ProjectedVariants {
         proj_variants,
         proj_ref_variants,
         proj_own_variants,
         proj_arms,
         proj_ref_arms,
         proj_own_arms,
     } = visit_variants(cx, variants)<span class="question-mark">?</span>;

     <span class="kw">let </span>proj_ident = <span class="kw-2">&amp;</span>cx.proj.mut_ident;
     <span class="kw">let </span>proj_ref_ident = <span class="kw-2">&amp;</span>cx.proj.ref_ident;
     <span class="kw">let </span>proj_own_ident = <span class="kw-2">&amp;</span>cx.proj.own_ident;
     <span class="kw">let </span>vis = <span class="kw-2">&amp;</span>cx.proj.vis;
     <span class="kw">let </span><span class="kw-2">mut </span>orig_generics = cx.orig.generics.clone();
     <span class="kw">let </span>orig_where_clause = orig_generics.where_clause.take();
     <span class="kw">let </span>proj_generics = <span class="kw-2">&amp;</span>cx.proj.generics;
     <span class="kw">let </span>proj_where_clause = <span class="kw-2">&amp;</span>cx.proj.where_clause;

     <span class="kw">let </span>(proj_attrs, proj_ref_attrs, proj_own_attrs) = proj_allowed_lints(cx);
     <span class="kw">if </span>cx.project {
         generate.extend(<span class="bool-val">true</span>, <span class="macro">quote! </span>{
             #proj_attrs
             #vis <span class="kw">enum </span>#proj_ident #proj_generics #proj_where_clause {
                 #proj_variants
             }
         });
     }
     <span class="kw">if </span>cx.project_ref {
         generate.extend(<span class="bool-val">true</span>, <span class="macro">quote! </span>{
             #proj_ref_attrs
             #vis <span class="kw">enum </span>#proj_ref_ident #proj_generics #proj_where_clause {
                 #proj_ref_variants
             }
         });
     }
     <span class="kw">if </span>cx.project_replace.ident().is_some() {
         generate.extend(<span class="bool-val">true</span>, <span class="macro">quote! </span>{
             #proj_own_attrs
             #vis <span class="kw">enum </span>#proj_own_ident #orig_generics #orig_where_clause {
                 #proj_own_variants
             }
         });
     }

     <span class="kw">let </span>proj_mut_body = <span class="macro">quote! </span>{
         <span class="kw">match </span><span class="self">self</span>.get_unchecked_mut() {
             #proj_arms
         }
     };
     <span class="kw">let </span>proj_ref_body = <span class="macro">quote! </span>{
         <span class="kw">match </span><span class="self">self</span>.get_ref() {
             #proj_ref_arms
         }
     };
     <span class="kw">let </span>proj_own_body = <span class="macro">quote! </span>{
         <span class="kw">match </span><span class="kw-2">&amp;mut *</span>__self_ptr {
             #proj_own_arms
         }
     };
     generate.extend(<span class="bool-val">false</span>, make_proj_impl(cx, <span class="kw-2">&amp;</span>proj_mut_body, <span class="kw-2">&amp;</span>proj_ref_body, <span class="kw-2">&amp;</span>proj_own_body));

     <span class="prelude-val">Ok</span>(())
 }

 <span class="kw">fn </span>visit_variants&lt;<span class="lifetime">&#39;a</span>&gt;(cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;a</span>&gt;, variants: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Variants) -&gt; <span class="prelude-ty">Result</span>&lt;ProjectedVariants&gt; {
     <span class="kw">let </span><span class="kw-2">mut </span>proj_variants = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_ref_variants = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_own_variants = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_arms = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_ref_arms = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_own_arms = TokenStream::new();

     <span class="kw">for </span>Variant { ident, fields, .. } <span class="kw">in </span>variants {
         <span class="kw">let </span>ProjectedFields {
             proj_pat,
             proj_body,
             proj_fields,
             proj_ref_fields,
             proj_own_fields,
             proj_own_body,
         } = <span class="kw">match </span>fields {
             Fields::Named(<span class="kw">_</span>) =&gt; visit_fields(cx, <span class="prelude-val">Some</span>(ident), fields, Delimiter::Brace)<span class="question-mark">?</span>,
             Fields::Unnamed(<span class="kw">_</span>) =&gt; visit_fields(cx, <span class="prelude-val">Some</span>(ident), fields, Delimiter::Parenthesis)<span class="question-mark">?</span>,
             Fields::Unit =&gt; ProjectedFields {
                 proj_own_body: proj_own_body(cx, <span class="prelude-val">Some</span>(ident), <span class="prelude-val">None</span>, <span class="kw-2">&amp;</span>[]),
                 ..Default::default()
             },
         };

         <span class="kw">let </span>proj_ident = <span class="kw-2">&amp;</span>cx.proj.mut_ident;
         <span class="kw">let </span>proj_ref_ident = <span class="kw-2">&amp;</span>cx.proj.ref_ident;
         proj_variants.extend(<span class="macro">quote! </span>{
             #ident #proj_fields,
         });
         proj_ref_variants.extend(<span class="macro">quote! </span>{
             #ident #proj_ref_fields,
         });
         proj_own_variants.extend(<span class="macro">quote! </span>{
             #ident #proj_own_fields,
         });
         proj_arms.extend(<span class="macro">quote! </span>{
             <span class="self">Self</span>::#ident #proj_pat =&gt; #proj_ident::#ident #proj_body,
         });
         proj_ref_arms.extend(<span class="macro">quote! </span>{
             <span class="self">Self</span>::#ident #proj_pat =&gt; #proj_ref_ident::#ident #proj_body,
         });
         proj_own_arms.extend(<span class="macro">quote! </span>{
             <span class="self">Self</span>::#ident #proj_pat =&gt; { #proj_own_body }
         });
     }

     <span class="prelude-val">Ok</span>(ProjectedVariants {
         proj_variants,
         proj_ref_variants,
         proj_own_variants,
         proj_arms,
         proj_ref_arms,
         proj_own_arms,
     })
 }

 <span class="kw">fn </span>visit_fields&lt;<span class="lifetime">&#39;a</span>&gt;(
     cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;a</span>&gt;,
     variant_ident: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Ident&gt;,
     fields: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Fields,
     delim: Delimiter,
 ) -&gt; <span class="prelude-ty">Result</span>&lt;ProjectedFields&gt; {
     <span class="kw">fn </span>surround(delim: Delimiter, tokens: TokenStream) -&gt; TokenStream {
         Group::new(delim, tokens).into_token_stream()
     }

     <span class="kw">let </span><span class="kw-2">mut </span>proj_pat = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_body = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_fields = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_ref_fields = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_own_fields = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>proj_move = TokenStream::new();
     <span class="kw">let </span><span class="kw-2">mut </span>pinned_bindings = Vec::with_capacity(fields.len());

     <span class="kw">for </span>(i, Field { attrs, vis, ident, colon_token, ty, mutability: <span class="kw">_ </span>}) <span class="kw">in
         </span>fields.iter().enumerate()
     {
         <span class="kw">let </span>binding = ident.clone().unwrap_or_else(|| <span class="macro">format_ident!</span>(<span class="string">&quot;_{}&quot;</span>, i));
         proj_pat.extend(<span class="macro">quote!</span>(#binding,));
         <span class="kw">let </span>lifetime = <span class="kw-2">&amp;</span>cx.proj.lifetime;
         <span class="kw">if </span>attrs.position_exact(PIN)<span class="question-mark">?</span>.is_some() {
             proj_fields.extend(<span class="macro">quote! </span>{
                 #vis #ident #colon_token ::pin_project::__private::Pin&lt;<span class="kw-2">&amp;</span>#lifetime <span class="kw-2">mut </span>(#ty)&gt;,
             });
             proj_ref_fields.extend(<span class="macro">quote! </span>{
                 #vis #ident #colon_token ::pin_project::__private::Pin&lt;<span class="kw-2">&amp;</span>#lifetime (#ty)&gt;,
             });
             proj_own_fields.extend(<span class="macro">quote! </span>{
                 #vis #ident #colon_token ::pin_project::__private::PhantomData&lt;#ty&gt;,
             });
             proj_body.extend(<span class="macro">quote! </span>{
                 #ident #colon_token _pin_project::__private::Pin::new_unchecked(#binding),
             });
             proj_move.extend(<span class="macro">quote! </span>{
                 #ident #colon_token _pin_project::__private::PhantomData,
             });

             cx.pinned_fields.push(ty);
             pinned_bindings.push(binding);
         } <span class="kw">else </span>{
             proj_fields.extend(<span class="macro">quote! </span>{
                 #vis #ident #colon_token <span class="kw-2">&amp;</span>#lifetime <span class="kw-2">mut </span>(#ty),
             });
             proj_ref_fields.extend(<span class="macro">quote! </span>{
                 #vis #ident #colon_token <span class="kw-2">&amp;</span>#lifetime (#ty),
             });
             proj_own_fields.extend(<span class="macro">quote! </span>{
                 #vis #ident #colon_token #ty,
             });
             proj_body.extend(<span class="macro">quote! </span>{
                 #binding,
             });
             proj_move.extend(<span class="macro">quote! </span>{
                 #ident #colon_token _pin_project::__private::ptr::read(#binding),
             });
         }
     }

     <span class="kw">let </span>proj_pat = surround(delim, proj_pat);
     <span class="kw">let </span>proj_body = surround(delim, proj_body);
     <span class="kw">let </span>proj_fields = surround(delim, proj_fields);
     <span class="kw">let </span>proj_ref_fields = surround(delim, proj_ref_fields);
     <span class="kw">let </span>proj_own_fields = surround(delim, proj_own_fields);

     <span class="kw">let </span>proj_move = Group::new(delim, proj_move);
     <span class="kw">let </span>proj_own_body = proj_own_body(cx, variant_ident, <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>proj_move), <span class="kw-2">&amp;</span>pinned_bindings);

     <span class="prelude-val">Ok</span>(ProjectedFields {
         proj_pat,
         proj_body,
         proj_own_body,
         proj_fields,
         proj_ref_fields,
         proj_own_fields,
     })
 }

 <span class="doccomment">/// Generates the processing that `project_replace` does for the struct or each variant.
 ///
 /// Note: `pinned_fields` must be in declaration order.
 </span><span class="kw">fn </span>proj_own_body(
     cx: <span class="kw-2">&amp;</span>Context&lt;<span class="lifetime">&#39;_</span>&gt;,
     variant_ident: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Ident&gt;,
     proj_move: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Group&gt;,
     pinned_fields: <span class="kw-2">&amp;</span>[Ident],
 ) -&gt; TokenStream {
     <span class="kw">let </span>ident = <span class="kw-2">&amp;</span>cx.proj.own_ident;
     <span class="kw">let </span>proj_own = <span class="kw">match </span>variant_ident {
         <span class="prelude-val">Some</span>(variant_ident) =&gt; <span class="macro">quote!</span>(#ident::#variant_ident),
         <span class="prelude-val">None </span>=&gt; <span class="macro">quote!</span>(#ident),
     };

     <span class="comment">// The fields of the struct and the active enum variant are dropped
     // in declaration order.
     // Refs: https://doc.rust-lang.org/reference/destructors.html
     </span><span class="kw">let </span>pinned_fields = pinned_fields.iter().rev();

     <span class="macro">quote! </span>{
         <span class="comment">// First, extract all the unpinned fields.
         </span><span class="kw">let </span>__result = #proj_own #proj_move;

         <span class="comment">// Now create guards to drop all the pinned fields.
         //
         // Due to a compiler bug (https://github.com/rust-lang/rust/issues/47949)
         // this must be in its own scope, or else `__result` will not be dropped
         // if any of the destructors panic.
         </span>{
             #(
                 <span class="kw">let </span>__guard = _pin_project::__private::UnsafeDropInPlaceGuard::new(#pinned_fields);
             )*
         }

         <span class="comment">// Finally, return the result.
         </span>__result
     }
 }

 <span class="doccomment">/// Creates `Unpin` implementation for the original type.
 ///
 /// The kind of `Unpin` impl generated depends on `unpin_impl` field:
 /// - `UnpinImpl::Unsafe` - Implements `Unpin` via `UnsafeUnpin` impl.
 /// - `UnpinImpl::Negative` - Generates `Unpin` impl with bounds that will never be true.
 /// - `UnpinImpl::Default` - Generates `Unpin` impl that requires `Unpin` for all pinned fields.
 </span><span class="kw">fn </span>make_unpin_impl(cx: <span class="kw-2">&amp;</span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; TokenStream {
     <span class="kw">match </span>cx.unpin_impl {
         UnpinImpl::Unsafe(span) =&gt; {
             <span class="kw">let </span><span class="kw-2">mut </span>proj_generics = cx.proj.generics.clone();
             <span class="kw">let </span>orig_ident = cx.orig.ident;
             <span class="kw">let </span>lifetime = <span class="kw-2">&amp;</span>cx.proj.lifetime;

             <span class="comment">// Make the error message highlight `UnsafeUnpin` argument.
             </span>proj_generics.make_where_clause().predicates.push(<span class="macro">parse_quote_spanned! </span>{ span =&gt;
                 _pin_project::__private::Wrapper&lt;#lifetime, <span class="self">Self</span>&gt;: _pin_project::UnsafeUnpin
             });

             <span class="kw">let </span>(impl_generics, <span class="kw">_</span>, where_clause) = proj_generics.split_for_impl();
             <span class="kw">let </span>ty_generics = cx.orig.generics.split_for_impl().<span class="number">1</span>;

             <span class="macro">quote_spanned! </span>{ span =&gt;
                 <span class="kw">impl </span>#impl_generics _pin_project::__private::Unpin <span class="kw">for </span>#orig_ident #ty_generics
                 #where_clause
                 {
                 }
             }
         }
         UnpinImpl::Negative(span) =&gt; {
             <span class="kw">let </span><span class="kw-2">mut </span>proj_generics = cx.proj.generics.clone();
             <span class="kw">let </span>orig_ident = cx.orig.ident;
             <span class="kw">let </span>lifetime = <span class="kw-2">&amp;</span>cx.proj.lifetime;

             proj_generics.make_where_clause().predicates.push(<span class="macro">parse_quote! </span>{
                 _pin_project::__private::Wrapper&lt;
                     #lifetime, _pin_project::__private::PhantomPinned
                 &gt;: _pin_project::__private::Unpin
             });

             <span class="kw">let </span>(proj_impl_generics, <span class="kw">_</span>, proj_where_clause) = proj_generics.split_for_impl();
             <span class="kw">let </span>ty_generics = cx.orig.generics.split_for_impl().<span class="number">1</span>;

             <span class="comment">// For interoperability with `forbid(unsafe_code)`, `unsafe` token should be
             // call-site span.
             </span><span class="kw">let </span>unsafety = &lt;<span class="macro">Token!</span>[<span class="kw">unsafe</span>]&gt;::default();
             <span class="macro">quote_spanned! </span>{ span =&gt;
                 <span class="kw">impl </span>#proj_impl_generics _pin_project::__private::Unpin
                     <span class="kw">for </span>#orig_ident #ty_generics
                 #proj_where_clause
                 {
                 }

                 <span class="comment">// Generate a dummy impl of `UnsafeUnpin`, to ensure that the user cannot implement it.
                 //
                 // To ensure that users don&#39;t accidentally write a non-functional `UnsafeUnpin`
                 // impls, we emit one ourselves. If the user ends up writing an `UnsafeUnpin`
                 // impl, they&#39;ll get a &quot;conflicting implementations of trait&quot; error when
                 // coherence checks are run.
                 </span><span class="attribute">#[doc(hidden)]
                 </span>#unsafety <span class="kw">impl </span>#proj_impl_generics _pin_project::UnsafeUnpin
                     <span class="kw">for </span>#orig_ident #ty_generics
                 #proj_where_clause
                 {
                 }
             }
         }
         UnpinImpl::Default =&gt; {
             <span class="kw">let </span><span class="kw-2">mut </span>full_where_clause = cx.orig.generics.where_clause.clone().unwrap();

             <span class="comment">// Generate a field in our new struct for every
             // pinned field in the original type.
             </span><span class="kw">let </span>fields = cx.pinned_fields.iter().enumerate().map(|(i, ty)| {
                 <span class="kw">let </span>field_ident = <span class="macro">format_ident!</span>(<span class="string">&quot;__field{}&quot;</span>, i);
                 <span class="macro">quote!</span>(#field_ident: #ty)
             });

             <span class="comment">// We could try to determine the subset of type parameters
             // and lifetimes that are actually used by the pinned fields
             // (as opposed to those only used by unpinned fields).
             // However, this would be tricky and error-prone, since
             // it&#39;s possible for users to create types that would alias
             // with generic parameters (e.g. &#39;struct T&#39;).
             //
             // Instead, we generate a use of every single type parameter
             // and lifetime used in the original struct. For type parameters,
             // we generate code like this:
             //
             // ```rust
             // struct AlwaysUnpin&lt;T: ?Sized&gt;(PhantomData&lt;T&gt;) {}
             // impl&lt;T: ?Sized&gt; Unpin for AlwaysUnpin&lt;T&gt; {}
             //
             // ...
             // _field: AlwaysUnpin&lt;(A, B, C)&gt;
             // ```
             //
             // This ensures that any unused type parameters
             // don&#39;t end up with `Unpin` bounds.
             </span><span class="kw">let </span>lifetime_fields = cx.orig.generics.lifetimes().enumerate().map(
                 |(i, LifetimeParam { lifetime, .. })| {
                     <span class="kw">let </span>field_ident = <span class="macro">format_ident!</span>(<span class="string">&quot;__lifetime{}&quot;</span>, i);
                     <span class="macro">quote!</span>(#field_ident: <span class="kw-2">&amp;</span>#lifetime ())
                 },
             );

             <span class="kw">let </span>orig_ident = cx.orig.ident;
             <span class="kw">let </span>struct_ident = <span class="macro">format_ident!</span>(<span class="string">&quot;__{}&quot;</span>, orig_ident);
             <span class="kw">let </span>vis = cx.orig.vis;
             <span class="kw">let </span>lifetime = <span class="kw-2">&amp;</span>cx.proj.lifetime;
             <span class="kw">let </span>type_params = cx.orig.generics.type_params().map(|t| <span class="kw-2">&amp;</span>t.ident);
             <span class="kw">let </span>proj_generics = <span class="kw-2">&amp;</span>cx.proj.generics;
             <span class="kw">let </span>(proj_impl_generics, proj_ty_generics, <span class="kw">_</span>) = proj_generics.split_for_impl();
             <span class="kw">let </span>(<span class="kw">_</span>, ty_generics, where_clause) = cx.orig.generics.split_for_impl();

             full_where_clause.predicates.push(<span class="macro">parse_quote! </span>{
                 #struct_ident #proj_ty_generics: _pin_project::__private::Unpin
             });

             <span class="macro">quote! </span>{
                 <span class="comment">// This needs to have the same visibility as the original type,
                 // due to the limitations of the &#39;public in private&#39; error.
                 //
                 // Our goal is to implement the public trait `Unpin` for
                 // a potentially public user type. Because of this, rust
                 // requires that any types mentioned in the where clause of
                 // our `Unpin` impl also be public. This means that our generated
                 // `__UnpinStruct` type must also be public.
                 // However, we ensure that the user can never actually reference
                 // this &#39;public&#39; type by creating this type in the inside of `const`.
                 </span><span class="attribute">#[allow(missing_debug_implementations)]
                 </span>#vis <span class="kw">struct </span>#struct_ident #proj_generics #where_clause {
                     __pin_project_use_generics: _pin_project::__private::AlwaysUnpin&lt;
                         #lifetime, (#(_pin_project::__private::PhantomData&lt;#type_params&gt;),<span class="kw-2">*</span>)
                     &gt;,

                     #(#fields,)*
                     #(#lifetime_fields,)*
                 }

                 <span class="kw">impl </span>#proj_impl_generics _pin_project::__private::Unpin
                     <span class="kw">for </span>#orig_ident #ty_generics
                 #full_where_clause
                 {
                 }

                 <span class="comment">// Generate a dummy impl of `UnsafeUnpin`, to ensure that the user cannot implement it.
                 //
                 // To ensure that users don&#39;t accidentally write a non-functional `UnsafeUnpin`
                 // impls, we emit one ourselves. If the user ends up writing an `UnsafeUnpin`
                 // impl, they&#39;ll get a &quot;conflicting implementations of trait&quot; error when
                 // coherence checks are run.
                 </span><span class="attribute">#[doc(hidden)]
                 </span><span class="kw">unsafe impl </span>#proj_impl_generics _pin_project::UnsafeUnpin
                     <span class="kw">for </span>#orig_ident #ty_generics
                 #full_where_clause
                 {
                 }
             }
         }
     }
 }

 <span class="doccomment">/// Creates `Drop` implementation for the original type.
 ///
 /// The kind of `Drop` impl generated depends on `pinned_drop` field:
 /// - `Some` - implements `Drop` via `PinnedDrop` impl.
 /// - `None` - generates code that ensures that `Drop` trait is not implemented,
 ///            instead of generating `Drop` impl.
 </span><span class="kw">fn </span>make_drop_impl(cx: <span class="kw-2">&amp;</span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; TokenStream {
     <span class="kw">let </span>ident = cx.orig.ident;
     <span class="kw">let </span>(impl_generics, ty_generics, where_clause) = cx.orig.generics.split_for_impl();

     <span class="kw">if let </span><span class="prelude-val">Some</span>(span) = cx.pinned_drop {
         <span class="comment">// For interoperability with `forbid(unsafe_code)`, `unsafe` token should be
         // call-site span.
         </span><span class="kw">let </span>unsafety = &lt;<span class="macro">Token!</span>[<span class="kw">unsafe</span>]&gt;::default();
         <span class="macro">quote_spanned! </span>{ span =&gt;
             <span class="kw">impl </span>#impl_generics _pin_project::__private::Drop <span class="kw">for </span>#ident #ty_generics
             #where_clause
             {
                 <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
                     #unsafety {
                         <span class="comment">// Safety - we&#39;re in &#39;drop&#39;, so we know that &#39;self&#39; will
                         // never move again.
                         </span><span class="kw">let </span>__pinned_self = _pin_project::__private::Pin::new_unchecked(<span class="self">self</span>);
                         <span class="comment">// We call `pinned_drop` only once. Since `PinnedDrop::drop`
                         // is an unsafe method and a private API, it is never called again in safe
                         // code *unless the user uses a maliciously crafted macro*.
                         </span>_pin_project::__private::PinnedDrop::drop(__pinned_self);
                     }
                 }
             }
         }
     } <span class="kw">else </span>{
         <span class="comment">// If the user does not provide a `PinnedDrop` impl,
         // we need to ensure that they don&#39;t provide a `Drop` impl of their
         // own.
         // Based on https://github.com/upsuper/assert-impl/blob/f503255b292ab0ba8d085b657f4065403cfa46eb/src/lib.rs#L80-L87
         //
         // We create a new identifier for each struct, so that the traits
         // for different types do not conflict with each other.
         //
         // Another approach would be to provide an empty Drop impl,
         // which would conflict with a user-provided Drop impl.
         // However, this would trigger the compiler&#39;s special handling
         // of Drop types (e.g. fields cannot be moved out of a Drop type).
         // This approach prevents the creation of needless Drop impls,
         // giving users more flexibility.
         </span><span class="kw">let </span>trait_ident = <span class="macro">format_ident!</span>(<span class="string">&quot;{}MustNotImplDrop&quot;</span>, ident);

         <span class="macro">quote! </span>{
             <span class="comment">// There are two possible cases:
             // 1. The user type does not implement Drop. In this case,
             // the first blanked impl will not apply to it. This code
             // will compile, as there is only one impl of MustNotImplDrop for the user type
             // 2. The user type does impl Drop. This will make the blanket impl applicable,
             // which will then conflict with the explicit MustNotImplDrop impl below.
             // This will result in a compilation error, which is exactly what we want.
             </span><span class="kw">trait </span>#trait_ident {}
             <span class="attribute">#[allow(clippy::drop_bounds, drop_bounds)]
             </span><span class="kw">impl</span>&lt;T: _pin_project::__private::Drop&gt; #trait_ident <span class="kw">for </span>T {}
             <span class="kw">impl </span>#impl_generics #trait_ident <span class="kw">for </span>#ident #ty_generics #where_clause {}

             <span class="comment">// Generate a dummy impl of `PinnedDrop`, to ensure that the user cannot implement it.
             // Since the user did not pass `PinnedDrop` to `#[pin_project]`, any `PinnedDrop`
             // impl will not actually be called. Unfortunately, we can&#39;t detect this situation
             // directly from either the `#[pin_project]` or `#[pinned_drop]` attributes, since
             // we don&#39;t know what other attributes/impl may exist.
             //
             // To ensure that users don&#39;t accidentally write a non-functional `PinnedDrop`
             // impls, we emit one ourselves. If the user ends up writing a `PinnedDrop` impl,
             // they&#39;ll get a &quot;conflicting implementations of trait&quot; error when coherence
             // checks are run.
             </span><span class="attribute">#[doc(hidden)]
             </span><span class="kw">impl </span>#impl_generics _pin_project::__private::PinnedDrop <span class="kw">for </span>#ident #ty_generics
             #where_clause
             {
                 <span class="kw">unsafe fn </span>drop(<span class="self">self</span>: _pin_project::__private::Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;) {}
             }
         }
     }
 }

 <span class="doccomment">/// Creates an implementation of the projection methods.
 ///
 /// On structs, both the `project` and `project_ref` methods are always generated,
 /// and the `project_replace` method is only generated if `ProjReplace::span` is `Some`.
 ///
 /// On enums, only methods that the returned projected type is named will be generated.
 </span><span class="kw">fn </span>make_proj_impl(
     cx: <span class="kw-2">&amp;</span>Context&lt;<span class="lifetime">&#39;_</span>&gt;,
     proj_body: <span class="kw-2">&amp;</span>TokenStream,
     proj_ref_body: <span class="kw-2">&amp;</span>TokenStream,
     proj_own_body: <span class="kw-2">&amp;</span>TokenStream,
 ) -&gt; TokenStream {
     <span class="kw">let </span>vis = <span class="kw-2">&amp;</span>cx.proj.vis;
     <span class="kw">let </span>lifetime = <span class="kw-2">&amp;</span>cx.proj.lifetime;
     <span class="kw">let </span>orig_ident = cx.orig.ident;
     <span class="kw">let </span>proj_ident = <span class="kw-2">&amp;</span>cx.proj.mut_ident;
     <span class="kw">let </span>proj_ref_ident = <span class="kw-2">&amp;</span>cx.proj.ref_ident;
     <span class="kw">let </span>proj_own_ident = <span class="kw-2">&amp;</span>cx.proj.own_ident;

     <span class="kw">let </span>orig_ty_generics = cx.orig.generics.split_for_impl().<span class="number">1</span>;
     <span class="kw">let </span>proj_ty_generics = cx.proj.generics.split_for_impl().<span class="number">1</span>;
     <span class="kw">let </span>(impl_generics, ty_generics, where_clause) = cx.orig.generics.split_for_impl();
     <span class="comment">// TODO: For enums and project_replace, dead_code warnings should not be
     // allowed because methods are not generated unless explicitly specified.
     // However, there is currently no good way to allow warnings for generated
     // code, so we allow warnings for all methods for now.
     </span><span class="kw">let </span>allow_dead_code = <span class="macro">quote! </span>{ <span class="attribute">#[allow(dead_code)] </span>};

     <span class="kw">let </span><span class="kw-2">mut </span>project = <span class="prelude-val">Some</span>(<span class="macro">quote! </span>{
         #allow_dead_code
         #vis <span class="kw">fn </span>project&lt;#lifetime&gt;(
             <span class="self">self</span>: _pin_project::__private::Pin&lt;<span class="kw-2">&amp;</span>#lifetime <span class="kw-2">mut </span><span class="self">Self</span>&gt;,
         ) -&gt; #proj_ident #proj_ty_generics {
             <span class="kw">unsafe </span>{
                 #proj_body
             }
         }
     });
     <span class="kw">let </span><span class="kw-2">mut </span>project_ref = <span class="prelude-val">Some</span>(<span class="macro">quote! </span>{
         #allow_dead_code
         <span class="attribute">#[allow(clippy::missing_const_for_fn)]
         </span>#vis <span class="kw">fn </span>project_ref&lt;#lifetime&gt;(
             <span class="self">self</span>: _pin_project::__private::Pin&lt;<span class="kw-2">&amp;</span>#lifetime <span class="self">Self</span>&gt;,
         ) -&gt; #proj_ref_ident #proj_ty_generics {
             <span class="kw">unsafe </span>{
                 #proj_ref_body
             }
         }
     });
     <span class="kw">let </span><span class="kw-2">mut </span>project_replace = cx.project_replace.span().map(|span| {
         <span class="comment">// It is enough to only set the span of the signature.
         </span><span class="kw">let </span>sig = <span class="macro">quote_spanned! </span>{ span =&gt;
             #allow_dead_code
             #vis <span class="kw">fn </span>project_replace(
                 <span class="self">self</span>: _pin_project::__private::Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;,
                 __replacement: <span class="self">Self</span>,
             ) -&gt; #proj_own_ident #orig_ty_generics
         };
         <span class="macro">quote! </span>{
             #sig {
                 <span class="kw">unsafe </span>{
                     <span class="kw">let </span>__self_ptr: <span class="kw-2">*mut </span><span class="self">Self </span>= <span class="self">self</span>.get_unchecked_mut();

                     <span class="comment">// Destructors will run in reverse order, so next create a guard to overwrite
                     // `self` with the replacement value without calling destructors.
                     </span><span class="kw">let </span>__guard = _pin_project::__private::UnsafeOverwriteGuard::new(
                         __self_ptr,
                         __replacement,
                     );

                     #proj_own_body
                 }
             }
         }
     });

     <span class="kw">if </span>cx.kind == Enum {
         <span class="kw">if </span>!cx.project {
             project = <span class="prelude-val">None</span>;
         }
         <span class="kw">if </span>!cx.project_ref {
             project_ref = <span class="prelude-val">None</span>;
         }
         <span class="kw">if </span>cx.project_replace.ident().is_none() {
             project_replace = <span class="prelude-val">None</span>;
         }
     }

     <span class="macro">quote! </span>{
         <span class="kw">impl </span>#impl_generics #orig_ident #ty_generics #where_clause {
             #project
             #project_ref
             #project_replace
         }
     }
 }

 <span class="doccomment">/// Checks that the `[repr(packed)]` attribute is not included.
 ///
 /// This currently does two checks:
 /// - Checks the attributes of structs to ensure there is no `[repr(packed)]`.
 /// - Generates a function that borrows fields without an unsafe block and
 ///   forbidding `unaligned_references` lint.
 </span><span class="kw">fn </span>ensure_not_packed(orig: <span class="kw-2">&amp;</span>OriginalType&lt;<span class="lifetime">&#39;_</span>&gt;, fields: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Fields&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;TokenStream&gt; {
     <span class="kw">for </span>attr <span class="kw">in </span>orig.attrs {
         <span class="kw">if let </span>Meta::List(<span class="kw-2">ref </span>list) = attr.meta {
             <span class="kw">if </span>list.path.is_ident(<span class="string">&quot;repr&quot;</span>) {
                 <span class="kw">for </span>repr <span class="kw">in </span>list.parse_args_with(Punctuated::&lt;Meta, <span class="macro">Token!</span>[,]&gt;::parse_terminated)<span class="question-mark">? </span>{
                     <span class="kw">if </span>repr.path().is_ident(<span class="string">&quot;packed&quot;</span>) {
                         <span class="kw">let </span>msg = <span class="kw">if </span>fields.is_none() {
                             <span class="comment">// #[repr(packed)] cannot be apply on enums and will be rejected by rustc.
                             // However, we should not rely on the behavior of rustc that rejects this.
                             // https://github.com/taiki-e/pin-project/pull/324#discussion_r612388001
                             </span><span class="string">&quot;#[repr(packed)] attribute should be applied to a struct or union&quot;
                         </span>} <span class="kw">else if </span>repr.require_name_value().is_ok() {
                             <span class="comment">// #[repr(packed = &quot;&quot;)] is not valid format of #[repr(packed)] and will be
                             // rejected by rustc.
                             // However, we should not rely on the behavior of rustc that rejects this.
                             // https://github.com/taiki-e/pin-project/pull/324#discussion_r612388001
                             </span><span class="string">&quot;#[repr(packed)] attribute should not be name-value pair&quot;
                         </span>} <span class="kw">else </span>{
                             <span class="string">&quot;#[pin_project] attribute may not be used on #[repr(packed)] types&quot;
                         </span>};
                         <span class="macro">bail!</span>(repr, msg);
                     }
                 }
             }
         }
     }

     <span class="kw">let </span>fields = <span class="kw">match </span>fields {
         <span class="prelude-val">Some</span>(fields) =&gt; fields,
         <span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(TokenStream::new()),
     };

     <span class="comment">// Workaround for https://github.com/taiki-e/pin-project/issues/32
     // Through the tricky use of proc macros, it&#39;s possible to bypass
     // the above check for the `repr` attribute.
     // To ensure that it&#39;s impossible to use pin projections on a `#[repr(packed)]`
     // struct, we generate code like this:
     //
     // ```rust
     // #[forbid(unaligned_references)]
     // fn assert_not_repr_packed(val: &amp;MyStruct) {
     //     let _field_1 = &amp;val.field_1;
     //     let _field_2 = &amp;val.field_2;
     //     ...
     //     let _field_n = &amp;val.field_n;
     // }
     // ```
     //
     // Taking a reference to a packed field is UB, and applying
     // `#[forbid(unaligned_references)]` makes sure that doing this is a hard error.
     //
     // If the struct ends up having `#[repr(packed)]` applied somehow,
     // this will generate an (unfriendly) error message. Under all reasonable
     // circumstances, we&#39;ll detect the `#[repr(packed)]` attribute, and generate
     // a much nicer error above.
     //
     // There is one exception: If the type of a struct field has an alignment of 1
     // (e.g. u8), it is always safe to take a reference to it, even if the struct
     // is `#[repr(packed)]`. If the struct is composed entirely of types of
     // alignment 1, our generated method will not trigger an error if the
     // struct is `#[repr(packed)]`.
     //
     // Fortunately, this should have no observable consequence - `#[repr(packed)]`
     // is essentially a no-op on such a type. Nevertheless, we include a test
     // to ensure that the compiler doesn&#39;t ever try to copy the fields on
     // such a struct when trying to drop it - which is reason we prevent
     // `#[repr(packed)]` in the first place.
     //
     // See also https://github.com/taiki-e/pin-project/pull/34.
     //
     // Note:
     // - Lint-based tricks aren&#39;t perfect, but they&#39;re much better than nothing:
     //   https://github.com/taiki-e/pin-project-lite/issues/26
     //
     // - Enable both unaligned_references and safe_packed_borrows lints
     //   because unaligned_references lint does not exist in older compilers:
     //   https://github.com/taiki-e/pin-project-lite/pull/55
     //   https://github.com/rust-lang/rust/pull/82525
     </span><span class="kw">let </span><span class="kw-2">mut </span>field_refs = <span class="macro">vec!</span>[];
     <span class="kw">match </span>fields {
         Fields::Named(FieldsNamed { named, .. }) =&gt; {
             <span class="kw">for </span>Field { ident, .. } <span class="kw">in </span>named {
                 field_refs.push(<span class="macro">quote!</span>(<span class="kw-2">&amp;</span>this.#ident));
             }
         }
         Fields::Unnamed(FieldsUnnamed { unnamed, .. }) =&gt; {
             <span class="kw">for </span>(index, <span class="kw">_</span>) <span class="kw">in </span>unnamed.iter().enumerate() {
                 <span class="kw">let </span>index = Index::from(index);
                 field_refs.push(<span class="macro">quote!</span>(<span class="kw-2">&amp;</span>this.#index));
             }
         }
         Fields::Unit =&gt; {}
     }

     <span class="kw">let </span>(impl_generics, ty_generics, where_clause) = orig.generics.split_for_impl();
     <span class="kw">let </span>ident = orig.ident;
     <span class="prelude-val">Ok</span>(<span class="macro">quote! </span>{
         <span class="attribute">#[forbid(unaligned_references, safe_packed_borrows)]
         </span><span class="kw">fn </span>__assert_not_repr_packed #impl_generics (this: <span class="kw-2">&amp;</span>#ident #ty_generics) #where_clause {
             #(<span class="kw">let _ </span>= #field_refs;)*
         }
     })
 }
 </code></pre></div>
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