mirror of https://github.com/rust-lang/rust
28 lines
517 B
Rust
28 lines
517 B
Rust
#![feature(impl_trait_in_assoc_type)]
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use std::fmt::Debug;
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pub trait Foo {
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type Item: Debug;
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fn foo<T: Debug>(_: T) -> Self::Item;
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}
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#[derive(Debug)]
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pub struct S<T>(std::marker::PhantomData<T>);
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pub struct S2;
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impl Foo for S2 {
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type Item = impl Debug;
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fn foo<T: Debug>(_: T) -> Self::Item {
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S::<T>(Default::default())
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//~^ Error type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
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}
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}
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fn main() {
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S2::foo(123);
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}
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