| <!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/async-trait-0.1.68/src/expand.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>expand.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="../../async_trait/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="../../async_trait/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><span class="kw">crate</span>::bound::{has_bound, InferredBound, Supertraits}; |
| <span class="kw">use </span><span class="kw">crate</span>::lifetime::{AddLifetimeToImplTrait, CollectLifetimes}; |
| <span class="kw">use </span><span class="kw">crate</span>::parse::Item; |
| <span class="kw">use </span><span class="kw">crate</span>::receiver::{has_self_in_block, has_self_in_sig, mut_pat, ReplaceSelf}; |
| <span class="kw">use </span><span class="kw">crate</span>::verbatim::VerbatimFn; |
| <span class="kw">use </span>proc_macro2::{Span, TokenStream}; |
| <span class="kw">use </span>quote::{format_ident, quote, quote_spanned, ToTokens}; |
| <span class="kw">use </span>std::collections::BTreeSet <span class="kw">as </span>Set; |
| <span class="kw">use </span>std::mem; |
| <span class="kw">use </span>syn::punctuated::Punctuated; |
| <span class="kw">use </span>syn::visit_mut::{<span class="self">self</span>, VisitMut}; |
| <span class="kw">use </span>syn::{ |
| parse_quote, parse_quote_spanned, Attribute, Block, FnArg, GenericArgument, GenericParam, |
| Generics, Ident, ImplItem, Lifetime, LifetimeParam, Pat, PatIdent, PathArguments, Receiver, |
| ReturnType, Signature, Token, TraitItem, Type, TypePath, WhereClause, |
| }; |
| |
| <span class="kw">impl </span>ToTokens <span class="kw">for </span>Item { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Item::Trait(item) => item.to_tokens(tokens), |
| Item::Impl(item) => item.to_tokens(tokens), |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy)] |
| </span><span class="kw">enum </span>Context<<span class="lifetime">'a</span>> { |
| Trait { |
| generics: <span class="kw-2">&</span><span class="lifetime">'a </span>Generics, |
| supertraits: <span class="kw-2">&</span><span class="lifetime">'a </span>Supertraits, |
| }, |
| Impl { |
| impl_generics: <span class="kw-2">&</span><span class="lifetime">'a </span>Generics, |
| associated_type_impl_traits: <span class="kw-2">&</span><span class="lifetime">'a </span>Set<Ident>, |
| }, |
| } |
| |
| <span class="kw">impl </span>Context<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>lifetimes<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>, used: <span class="kw-2">&</span><span class="lifetime">'a </span>[Lifetime]) -> <span class="kw">impl </span>Iterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>LifetimeParam> { |
| <span class="kw">let </span>generics = <span class="kw">match </span><span class="self">self </span>{ |
| Context::Trait { generics, .. } => generics, |
| Context::Impl { impl_generics, .. } => impl_generics, |
| }; |
| generics.params.iter().filter_map(<span class="kw">move </span>|param| { |
| <span class="kw">if let </span>GenericParam::Lifetime(param) = param { |
| <span class="kw">if </span>used.contains(<span class="kw-2">&</span>param.lifetime) { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(param); |
| } |
| } |
| <span class="prelude-val">None |
| </span>}) |
| } |
| } |
| |
| <span class="kw">pub fn </span>expand(input: <span class="kw-2">&mut </span>Item, is_local: bool) { |
| <span class="kw">match </span>input { |
| Item::Trait(input) => { |
| <span class="kw">let </span>context = Context::Trait { |
| generics: <span class="kw-2">&</span>input.generics, |
| supertraits: <span class="kw-2">&</span>input.supertraits, |
| }; |
| <span class="kw">for </span>inner <span class="kw">in </span><span class="kw-2">&mut </span>input.items { |
| <span class="kw">if let </span>TraitItem::Fn(method) = inner { |
| <span class="kw">let </span>sig = <span class="kw-2">&mut </span>method.sig; |
| <span class="kw">if </span>sig.asyncness.is_some() { |
| <span class="kw">let </span>block = <span class="kw-2">&mut </span>method.default; |
| <span class="kw">let </span><span class="kw-2">mut </span>has_self = has_self_in_sig(sig); |
| method.attrs.push(<span class="macro">parse_quote!</span>(<span class="attribute">#[must_use]</span>)); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(block) = block { |
| has_self |= has_self_in_block(block); |
| transform_block(context, sig, block); |
| method.attrs.push(lint_suppress_with_body()); |
| } <span class="kw">else </span>{ |
| method.attrs.push(lint_suppress_without_body()); |
| } |
| <span class="kw">let </span>has_default = method.default.is_some(); |
| transform_sig(context, sig, has_self, has_default, is_local); |
| } |
| } |
| } |
| } |
| Item::Impl(input) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>associated_type_impl_traits = Set::new(); |
| <span class="kw">for </span>inner <span class="kw">in </span><span class="kw-2">&</span>input.items { |
| <span class="kw">if let </span>ImplItem::Type(assoc) = inner { |
| <span class="kw">if let </span>Type::ImplTrait(<span class="kw">_</span>) = assoc.ty { |
| associated_type_impl_traits.insert(assoc.ident.clone()); |
| } |
| } |
| } |
| |
| <span class="kw">let </span>context = Context::Impl { |
| impl_generics: <span class="kw-2">&</span>input.generics, |
| associated_type_impl_traits: <span class="kw-2">&</span>associated_type_impl_traits, |
| }; |
| <span class="kw">for </span>inner <span class="kw">in </span><span class="kw-2">&mut </span>input.items { |
| <span class="kw">match </span>inner { |
| ImplItem::Fn(method) <span class="kw">if </span>method.sig.asyncness.is_some() => { |
| <span class="kw">let </span>sig = <span class="kw-2">&mut </span>method.sig; |
| <span class="kw">let </span>block = <span class="kw-2">&mut </span>method.block; |
| <span class="kw">let </span>has_self = has_self_in_sig(sig) || has_self_in_block(block); |
| transform_block(context, sig, block); |
| transform_sig(context, sig, has_self, <span class="bool-val">false</span>, is_local); |
| method.attrs.push(lint_suppress_with_body()); |
| } |
| ImplItem::Verbatim(tokens) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>method = <span class="kw">match </span>syn::parse2::<VerbatimFn>(tokens.clone()) { |
| <span class="prelude-val">Ok</span>(method) <span class="kw">if </span>method.sig.asyncness.is_some() => method, |
| <span class="kw">_ </span>=> <span class="kw">continue</span>, |
| }; |
| <span class="kw">let </span>sig = <span class="kw-2">&mut </span>method.sig; |
| <span class="kw">let </span>has_self = has_self_in_sig(sig); |
| transform_sig(context, sig, has_self, <span class="bool-val">false</span>, is_local); |
| method.attrs.push(lint_suppress_with_body()); |
| <span class="kw-2">*</span>tokens = <span class="macro">quote!</span>(#method); |
| } |
| <span class="kw">_ </span>=> {} |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>lint_suppress_with_body() -> Attribute { |
| <span class="macro">parse_quote! </span>{ |
| <span class="attribute">#[allow( |
| clippy::async_yields_async, |
| clippy::let_unit_value, |
| clippy::no_effect_underscore_binding, |
| clippy::shadow_same, |
| clippy::type_complexity, |
| clippy::type_repetition_in_bounds, |
| clippy::used_underscore_binding |
| )] |
| </span>} |
| } |
| |
| <span class="kw">fn </span>lint_suppress_without_body() -> Attribute { |
| <span class="macro">parse_quote! </span>{ |
| <span class="attribute">#[allow( |
| clippy::type_complexity, |
| clippy::type_repetition_in_bounds |
| )] |
| </span>} |
| } |
| |
| <span class="comment">// Input: |
| // async fn f<T>(&self, x: &T) -> Ret; |
| // |
| // Output: |
| // fn f<'life0, 'life1, 'async_trait, T>( |
| // &'life0 self, |
| // x: &'life1 T, |
| // ) -> Pin<Box<dyn Future<Output = Ret> + Send + 'async_trait>> |
| // where |
| // 'life0: 'async_trait, |
| // 'life1: 'async_trait, |
| // T: 'async_trait, |
| // Self: Sync + 'async_trait; |
| </span><span class="kw">fn </span>transform_sig( |
| context: Context, |
| sig: <span class="kw-2">&mut </span>Signature, |
| has_self: bool, |
| has_default: bool, |
| is_local: bool, |
| ) { |
| <span class="kw">let </span>default_span = sig.asyncness.take().unwrap().span; |
| sig.fn_token.span = default_span; |
| |
| <span class="kw">let </span>(ret_arrow, ret) = <span class="kw">match </span><span class="kw-2">&</span>sig.output { |
| ReturnType::Default => (<span class="macro">Token!</span>[->](default_span), <span class="macro">quote_spanned!</span>(default_span=> ())), |
| ReturnType::Type(arrow, ret) => (<span class="kw-2">*</span>arrow, <span class="macro">quote!</span>(#ret)), |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>lifetimes = CollectLifetimes::new(); |
| <span class="kw">for </span>arg <span class="kw">in </span>sig.inputs.iter_mut() { |
| <span class="kw">match </span>arg { |
| FnArg::Receiver(arg) => lifetimes.visit_receiver_mut(arg), |
| FnArg::Typed(arg) => lifetimes.visit_type_mut(<span class="kw-2">&mut </span>arg.ty), |
| } |
| } |
| |
| <span class="kw">for </span>param <span class="kw">in </span><span class="kw-2">&mut </span>sig.generics.params { |
| <span class="kw">match </span>param { |
| GenericParam::Type(param) => { |
| <span class="kw">let </span>param_name = <span class="kw-2">&</span>param.ident; |
| <span class="kw">let </span>span = <span class="kw">match </span>param.colon_token.take() { |
| <span class="prelude-val">Some</span>(colon_token) => colon_token.span, |
| <span class="prelude-val">None </span>=> param_name.span(), |
| }; |
| <span class="kw">let </span>bounds = mem::replace(<span class="kw-2">&mut </span>param.bounds, Punctuated::new()); |
| where_clause_or_default(<span class="kw-2">&mut </span>sig.generics.where_clause) |
| .predicates |
| .push(<span class="macro">parse_quote_spanned!</span>(span=> #param_name: <span class="lifetime">'async_trait </span>+ #bounds)); |
| } |
| GenericParam::Lifetime(param) => { |
| <span class="kw">let </span>param_name = <span class="kw-2">&</span>param.lifetime; |
| <span class="kw">let </span>span = <span class="kw">match </span>param.colon_token.take() { |
| <span class="prelude-val">Some</span>(colon_token) => colon_token.span, |
| <span class="prelude-val">None </span>=> param_name.span(), |
| }; |
| <span class="kw">let </span>bounds = mem::replace(<span class="kw-2">&mut </span>param.bounds, Punctuated::new()); |
| where_clause_or_default(<span class="kw-2">&mut </span>sig.generics.where_clause) |
| .predicates |
| .push(<span class="macro">parse_quote_spanned!</span>(span=> #param: <span class="lifetime">'async_trait </span>+ #bounds)); |
| } |
| GenericParam::Const(<span class="kw">_</span>) => {} |
| } |
| } |
| |
| <span class="kw">for </span>param <span class="kw">in </span>context.lifetimes(<span class="kw-2">&</span>lifetimes.explicit) { |
| <span class="kw">let </span>param = <span class="kw-2">&</span>param.lifetime; |
| <span class="kw">let </span>span = param.span(); |
| where_clause_or_default(<span class="kw-2">&mut </span>sig.generics.where_clause) |
| .predicates |
| .push(<span class="macro">parse_quote_spanned!</span>(span=> #param: <span class="lifetime">'async_trait</span>)); |
| } |
| |
| <span class="kw">if </span>sig.generics.lt_token.is_none() { |
| sig.generics.lt_token = <span class="prelude-val">Some</span>(<span class="macro">Token!</span>[<](sig.ident.span())); |
| } |
| <span class="kw">if </span>sig.generics.gt_token.is_none() { |
| sig.generics.gt_token = <span class="prelude-val">Some</span>(<span class="macro">Token!</span>[>](sig.paren_token.span.join())); |
| } |
| |
| <span class="kw">for </span>elided <span class="kw">in </span>lifetimes.elided { |
| sig.generics.params.push(<span class="macro">parse_quote!</span>(#elided)); |
| where_clause_or_default(<span class="kw-2">&mut </span>sig.generics.where_clause) |
| .predicates |
| .push(<span class="macro">parse_quote_spanned!</span>(elided.span()=> #elided: <span class="lifetime">'async_trait</span>)); |
| } |
| |
| sig.generics |
| .params |
| .push(<span class="macro">parse_quote_spanned!</span>(default_span=> <span class="lifetime">'async_trait</span>)); |
| |
| <span class="kw">if </span>has_self { |
| <span class="kw">let </span>bounds: <span class="kw-2">&</span>[InferredBound] = <span class="kw">if let </span><span class="prelude-val">Some</span>(receiver) = sig.receiver() { |
| <span class="kw">match </span>receiver.ty.as_ref() { |
| <span class="comment">// self: &Self |
| </span>Type::Reference(ty) <span class="kw">if </span>ty.mutability.is_none() => <span class="kw-2">&</span>[InferredBound::Sync], |
| <span class="comment">// self: Arc<Self> |
| </span>Type::Path(ty) |
| <span class="kw">if </span>{ |
| <span class="kw">let </span>segment = ty.path.segments.last().unwrap(); |
| segment.ident == <span class="string">"Arc" |
| </span>&& <span class="kw">match </span><span class="kw-2">&</span>segment.arguments { |
| PathArguments::AngleBracketed(arguments) => { |
| arguments.args.len() == <span class="number">1 |
| </span>&& <span class="kw">match </span><span class="kw-2">&</span>arguments.args[<span class="number">0</span>] { |
| GenericArgument::Type(Type::Path(arg)) => { |
| arg.path.is_ident(<span class="string">"Self"</span>) |
| } |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } => |
| { |
| <span class="kw-2">&</span>[InferredBound::Sync, InferredBound::Send] |
| } |
| <span class="kw">_ </span>=> <span class="kw-2">&</span>[InferredBound::Send], |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw-2">&</span>[InferredBound::Send] |
| }; |
| |
| <span class="kw">let </span>bounds = bounds.iter().filter_map(|bound| { |
| <span class="kw">let </span>assume_bound = <span class="kw">match </span>context { |
| Context::Trait { supertraits, .. } => !has_default || has_bound(supertraits, bound), |
| Context::Impl { .. } => <span class="bool-val">true</span>, |
| }; |
| <span class="kw">if </span>assume_bound || is_local { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(bound.spanned_path(default_span)) |
| } |
| }); |
| |
| where_clause_or_default(<span class="kw-2">&mut </span>sig.generics.where_clause) |
| .predicates |
| .push(<span class="macro">parse_quote_spanned! </span>{default_span=> |
| <span class="self">Self</span>: #(#bounds +)* <span class="lifetime">'async_trait |
| </span>}); |
| } |
| |
| <span class="kw">for </span>(i, arg) <span class="kw">in </span>sig.inputs.iter_mut().enumerate() { |
| <span class="kw">match </span>arg { |
| FnArg::Receiver(receiver) => { |
| <span class="kw">if </span>receiver.reference.is_none() { |
| receiver.mutability = <span class="prelude-val">None</span>; |
| } |
| } |
| FnArg::Typed(arg) => { |
| <span class="kw">if match </span><span class="kw-2">*</span>arg.ty { |
| Type::Reference(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">true</span>, |
| } { |
| <span class="kw">if let </span>Pat::Ident(pat) = <span class="kw-2">&mut *</span>arg.pat { |
| pat.by_ref = <span class="prelude-val">None</span>; |
| pat.mutability = <span class="prelude-val">None</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>positional = positional_arg(i, <span class="kw-2">&</span>arg.pat); |
| <span class="kw">let </span>m = mut_pat(<span class="kw-2">&mut </span>arg.pat); |
| arg.pat = <span class="macro">parse_quote!</span>(#m #positional); |
| } |
| } |
| AddLifetimeToImplTrait.visit_type_mut(<span class="kw-2">&mut </span>arg.ty); |
| } |
| } |
| } |
| |
| <span class="kw">let </span>bounds = <span class="kw">if </span>is_local { |
| <span class="macro">quote_spanned!</span>(default_span=> <span class="lifetime">'async_trait</span>) |
| } <span class="kw">else </span>{ |
| <span class="macro">quote_spanned!</span>(default_span=> ::core::marker::Send + <span class="lifetime">'async_trait</span>) |
| }; |
| sig.output = <span class="macro">parse_quote_spanned! </span>{default_span=> |
| #ret_arrow ::core::pin::Pin<Box< |
| <span class="kw">dyn </span>::core::future::Future<Output = #ret> + #bounds |
| >> |
| }; |
| } |
| |
| <span class="comment">// Input: |
| // async fn f<T>(&self, x: &T, (a, b): (A, B)) -> Ret { |
| // self + x + a + b |
| // } |
| // |
| // Output: |
| // Box::pin(async move { |
| // let ___ret: Ret = { |
| // let __self = self; |
| // let x = x; |
| // let (a, b) = __arg1; |
| // |
| // __self + x + a + b |
| // }; |
| // |
| // ___ret |
| // }) |
| </span><span class="kw">fn </span>transform_block(context: Context, sig: <span class="kw-2">&mut </span>Signature, block: <span class="kw-2">&mut </span>Block) { |
| <span class="kw">let </span><span class="kw-2">mut </span>self_span = <span class="prelude-val">None</span>; |
| <span class="kw">let </span>decls = sig |
| .inputs |
| .iter() |
| .enumerate() |
| .map(|(i, arg)| <span class="kw">match </span>arg { |
| FnArg::Receiver(Receiver { |
| self_token, |
| mutability, |
| .. |
| }) => { |
| <span class="kw">let </span>ident = Ident::new(<span class="string">"__self"</span>, self_token.span); |
| self_span = <span class="prelude-val">Some</span>(self_token.span); |
| <span class="macro">quote!</span>(<span class="kw">let </span>#mutability #ident = #self_token;) |
| } |
| FnArg::Typed(arg) => { |
| <span class="comment">// If there is a #[cfg(...)] attribute that selectively enables |
| // the parameter, forward it to the variable. |
| // |
| // This is currently not applied to the `self` parameter. |
| </span><span class="kw">let </span>attrs = arg.attrs.iter().filter(|attr| attr.path().is_ident(<span class="string">"cfg"</span>)); |
| |
| <span class="kw">if let </span>Type::Reference(<span class="kw">_</span>) = <span class="kw-2">*</span>arg.ty { |
| <span class="macro">quote!</span>() |
| } <span class="kw">else if let </span>Pat::Ident(PatIdent { |
| ident, mutability, .. |
| }) = <span class="kw-2">&*</span>arg.pat |
| { |
| <span class="macro">quote! </span>{ |
| #(#attrs)* |
| <span class="kw">let </span>#mutability #ident = #ident; |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>pat = <span class="kw-2">&</span>arg.pat; |
| <span class="kw">let </span>ident = positional_arg(i, pat); |
| <span class="kw">if let </span>Pat::Wild(<span class="kw">_</span>) = <span class="kw-2">**</span>pat { |
| <span class="macro">quote! </span>{ |
| #(#attrs)* |
| <span class="kw">let </span>#ident = #ident; |
| } |
| } <span class="kw">else </span>{ |
| <span class="macro">quote! </span>{ |
| #(#attrs)* |
| <span class="kw">let </span>#pat = { |
| <span class="kw">let </span>#ident = #ident; |
| #ident |
| }; |
| } |
| } |
| } |
| } |
| }) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(span) = self_span { |
| <span class="kw">let </span><span class="kw-2">mut </span>replace_self = ReplaceSelf(span); |
| replace_self.visit_block_mut(block); |
| } |
| |
| <span class="kw">let </span>stmts = <span class="kw-2">&</span>block.stmts; |
| <span class="kw">let </span>let_ret = <span class="kw">match </span><span class="kw-2">&mut </span>sig.output { |
| ReturnType::Default => <span class="macro">quote_spanned! </span>{block.brace_token.span=> |
| #(#decls)* |
| <span class="kw">let _</span>: () = { #(#stmts)* }; |
| }, |
| ReturnType::Type(<span class="kw">_</span>, ret) => { |
| <span class="kw">if </span>contains_associated_type_impl_trait(context, ret) { |
| <span class="kw">if </span>decls.is_empty() { |
| <span class="macro">quote!</span>(#(#stmts)<span class="kw-2">*</span>) |
| } <span class="kw">else </span>{ |
| <span class="macro">quote!</span>(#(#decls)* { #(#stmts)* }) |
| } |
| } <span class="kw">else </span>{ |
| <span class="macro">quote_spanned! </span>{block.brace_token.span=> |
| <span class="kw">if let </span>::core::option::Option::Some(__ret) = ::core::option::Option::None::<#ret> { |
| <span class="kw">return </span>__ret; |
| } |
| #(#decls)* |
| <span class="kw">let </span>__ret: #ret = { #(#stmts)* }; |
| <span class="attribute">#[allow(unreachable_code)] |
| </span>__ret |
| } |
| } |
| } |
| }; |
| <span class="kw">let </span>box_pin = <span class="macro">quote_spanned!</span>(block.brace_token.span=> |
| Box::pin(<span class="kw">async move </span>{ #let_ret }) |
| ); |
| block.stmts = <span class="macro">parse_quote!</span>(#box_pin); |
| } |
| |
| <span class="kw">fn </span>positional_arg(i: usize, pat: <span class="kw-2">&</span>Pat) -> Ident { |
| <span class="kw">let </span>span: Span = syn::spanned::Spanned::span(pat); |
| <span class="attribute">#[cfg(not(no_span_mixed_site))] |
| </span><span class="kw">let </span>span = span.resolved_at(Span::mixed_site()); |
| <span class="macro">format_ident!</span>(<span class="string">"__arg{}"</span>, i, span = span) |
| } |
| |
| <span class="kw">fn </span>contains_associated_type_impl_trait(context: Context, ret: <span class="kw-2">&mut </span>Type) -> bool { |
| <span class="kw">struct </span>AssociatedTypeImplTraits<<span class="lifetime">'a</span>> { |
| set: <span class="kw-2">&</span><span class="lifetime">'a </span>Set<Ident>, |
| contains: bool, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> VisitMut <span class="kw">for </span>AssociatedTypeImplTraits<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>visit_type_path_mut(<span class="kw-2">&mut </span><span class="self">self</span>, ty: <span class="kw-2">&mut </span>TypePath) { |
| <span class="kw">if </span>ty.qself.is_none() |
| && ty.path.segments.len() == <span class="number">2 |
| </span>&& ty.path.segments[<span class="number">0</span>].ident == <span class="string">"Self" |
| </span>&& <span class="self">self</span>.set.contains(<span class="kw-2">&</span>ty.path.segments[<span class="number">1</span>].ident) |
| { |
| <span class="self">self</span>.contains = <span class="bool-val">true</span>; |
| } |
| visit_mut::visit_type_path_mut(<span class="self">self</span>, ty); |
| } |
| } |
| |
| <span class="kw">match </span>context { |
| Context::Trait { .. } => <span class="bool-val">false</span>, |
| Context::Impl { |
| associated_type_impl_traits, |
| .. |
| } => { |
| <span class="kw">let </span><span class="kw-2">mut </span>visit = AssociatedTypeImplTraits { |
| set: associated_type_impl_traits, |
| contains: <span class="bool-val">false</span>, |
| }; |
| visit.visit_type_mut(ret); |
| visit.contains |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>where_clause_or_default(clause: <span class="kw-2">&mut </span><span class="prelude-ty">Option</span><WhereClause>) -> <span class="kw-2">&mut </span>WhereClause { |
| clause.get_or_insert_with(|| WhereClause { |
| where_token: Default::default(), |
| predicates: Punctuated::new(), |
| }) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="async_trait" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
