mirror of https://github.com/rust-lang/rust
71 lines
2.5 KiB
Rust
71 lines
2.5 KiB
Rust
//@ edition:2021
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// gate-test-anonymous_lifetime_in_impl_trait
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// Verify the behaviour of `feature(anonymous_lifetime_in_impl_trait)`.
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mod elided {
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fn f(_: impl Iterator<Item = &()>) {}
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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fn g(mut x: impl Iterator<Item = &()>) -> Option<&()> { x.next() }
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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//~| ERROR missing lifetime specifier
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// Anonymous lifetimes in async fn are already allowed.
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// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
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async fn h(_: impl Iterator<Item = &()>) {}
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// Anonymous lifetimes in async fn are already allowed.
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// But that lifetime does not participate in resolution.
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async fn i(mut x: impl Iterator<Item = &()>) -> Option<&()> { x.next() }
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//~^ ERROR missing lifetime specifier
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//~| ERROR lifetime may not live long enough
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}
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mod underscore {
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fn f(_: impl Iterator<Item = &'_ ()>) {}
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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fn g(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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//~| ERROR missing lifetime specifier
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// Anonymous lifetimes in async fn are already allowed.
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// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
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async fn h(_: impl Iterator<Item = &'_ ()>) {}
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// Anonymous lifetimes in async fn are already allowed.
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// But that lifetime does not participate in resolution.
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async fn i(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
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//~^ ERROR missing lifetime specifier
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//~| ERROR lifetime may not live long enough
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}
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mod alone_in_path {
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trait Foo<'a> { fn next(&mut self) -> Option<&'a ()>; }
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fn f(_: impl Foo) {}
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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fn g(mut x: impl Foo) -> Option<&()> { x.next() }
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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//~| ERROR missing lifetime specifier
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}
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mod in_path {
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trait Foo<'a, T> { fn next(&mut self) -> Option<&'a T>; }
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fn f(_: impl Foo<()>) {}
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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fn g(mut x: impl Foo<()>) -> Option<&()> { x.next() }
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//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
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//~| ERROR missing lifetime specifier
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}
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// This must not err, as the `&` actually resolves to `'a`.
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fn resolved_anonymous<'a, T: 'a>(f: impl Fn(&'a str) -> &T) {
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f("f");
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}
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fn main() {}
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