mirror of https://github.com/rust-lang/rust
20 lines
562 B
Rust
20 lines
562 B
Rust
// It's not yet clear how '_ and GATs should interact.
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// Forbid it for now but proper support might be added
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// at some point in the future.
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#![feature(anonymous_lifetime_in_impl_trait)]
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trait Foo {
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type Item<'a>;
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}
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fn foo(x: &impl Foo<Item<'_> = u32>) { }
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//~^ ERROR `'_` cannot be used here [E0637]
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// Ok: the anonymous lifetime is bound to the function.
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fn bar(x: &impl for<'a> Foo<Item<'a> = &'_ u32>) { }
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// Ok: the anonymous lifetime is bound to the function.
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fn baz(x: &impl for<'a> Foo<Item<'a> = &u32>) { }
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fn main() {}
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