mirror of https://github.com/rust-lang/rust
100 lines
4.1 KiB
Rust
100 lines
4.1 KiB
Rust
//@ edition:2018
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// @has async_fn/fn.foo.html '//pre[@class="rust item-decl"]' 'pub async fn foo() -> Option<Foo>'
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pub async fn foo() -> Option<Foo> {
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None
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}
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// @has async_fn/fn.bar.html '//pre[@class="rust item-decl"]' 'pub async fn bar(a: i32, b: i32) -> i32'
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pub async fn bar(a: i32, b: i32) -> i32 {
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0
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}
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// @has async_fn/fn.baz.html '//pre[@class="rust item-decl"]' 'pub async fn baz<T>(a: T) -> T'
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pub async fn baz<T>(a: T) -> T {
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a
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}
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// @has async_fn/fn.qux.html '//pre[@class="rust item-decl"]' 'pub async unsafe fn qux() -> char'
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pub async unsafe fn qux() -> char {
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'⚠'
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}
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// @has async_fn/fn.mut_args.html '//pre[@class="rust item-decl"]' 'pub async fn mut_args(a: usize)'
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pub async fn mut_args(mut a: usize) {}
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// @has async_fn/fn.mut_ref.html '//pre[@class="rust item-decl"]' 'pub async fn mut_ref(x: i32)'
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pub async fn mut_ref(ref mut x: i32) {}
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trait Bar {}
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impl Bar for () {}
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// @has async_fn/fn.quux.html '//pre[@class="rust item-decl"]' 'pub async fn quux() -> impl Bar'
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pub async fn quux() -> impl Bar {
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()
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}
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// @has async_fn/struct.Foo.html
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// @matches - '//h4[@class="code-header"]' 'pub async fn f\(\)$'
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// @matches - '//h4[@class="code-header"]' 'pub async unsafe fn g\(\)$'
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// @matches - '//h4[@class="code-header"]' 'pub async fn mut_self\(self, first: usize\)$'
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pub struct Foo;
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impl Foo {
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pub async fn f() {}
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pub async unsafe fn g() {}
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pub async fn mut_self(mut self, mut first: usize) {}
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}
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pub trait Pattern<'a> {}
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impl Pattern<'_> for () {}
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pub trait Trait<const N: usize> {}
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// @has async_fn/fn.const_generics.html
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// @has - '//pre[@class="rust item-decl"]' 'pub async fn const_generics<const N: usize>(_: impl Trait<N>)'
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pub async fn const_generics<const N: usize>(_: impl Trait<N>) {}
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// test that elided lifetimes are properly elided and not displayed as `'_`
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// regression test for #63037
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// @has async_fn/fn.elided.html
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// @has - '//pre[@class="rust item-decl"]' 'pub async fn elided(foo: &str) -> &str'
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pub async fn elided(foo: &str) -> &str { "" }
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// This should really be shown as written, but for implementation reasons it's difficult.
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// See `impl Clean for TyKind::Ref`.
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// @has async_fn/fn.user_elided.html
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// @has - '//pre[@class="rust item-decl"]' 'pub async fn user_elided(foo: &str) -> &str'
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pub async fn user_elided(foo: &'_ str) -> &str { "" }
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// @has async_fn/fn.static_trait.html
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// @has - '//pre[@class="rust item-decl"]' 'pub async fn static_trait(foo: &str) -> Box<dyn Bar>'
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pub async fn static_trait(foo: &str) -> Box<dyn Bar> { Box::new(()) }
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// @has async_fn/fn.lifetime_for_trait.html
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// @has - '//pre[@class="rust item-decl"]' "pub async fn lifetime_for_trait(foo: &str) -> Box<dyn Bar + '_>"
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pub async fn lifetime_for_trait(foo: &str) -> Box<dyn Bar + '_> { Box::new(()) }
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// @has async_fn/fn.elided_in_input_trait.html
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// @has - '//pre[@class="rust item-decl"]' "pub async fn elided_in_input_trait(t: impl Pattern<'_>)"
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pub async fn elided_in_input_trait(t: impl Pattern<'_>) {}
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struct AsyncFdReadyGuard<'a, T> { x: &'a T }
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impl Foo {
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// @has async_fn/struct.Foo.html
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// @has - '//*[@class="method"]' 'pub async fn complicated_lifetimes( &self, context: &impl Bar ) -> impl Iterator<Item = &usize>'
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pub async fn complicated_lifetimes(&self, context: &impl Bar) -> impl Iterator<Item = &usize> {
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[0].iter()
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}
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// taken from `tokio` as an example of a method that was particularly bad before
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// @has - '//*[@class="method"]' "pub async fn readable<T>(&self) -> Result<AsyncFdReadyGuard<'_, T>, ()>"
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pub async fn readable<T>(&self) -> Result<AsyncFdReadyGuard<'_, T>, ()> { Err(()) }
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// @has - '//*[@class="method"]' "pub async fn mut_self(&mut self)"
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pub async fn mut_self(&mut self) {}
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}
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// test named lifetimes, just in case
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// @has async_fn/fn.named.html
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// @has - '//pre[@class="rust item-decl"]' "pub async fn named<'a, 'b>(foo: &'a str) -> &'b str"
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pub async fn named<'a, 'b>(foo: &'a str) -> &'b str { "" }
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// @has async_fn/fn.named_trait.html
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// @has - '//pre[@class="rust item-decl"]' "pub async fn named_trait<'a, 'b>(foo: impl Pattern<'a>) -> impl Pattern<'b>"
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pub async fn named_trait<'a, 'b>(foo: impl Pattern<'a>) -> impl Pattern<'b> {}
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