49 lines
831 B
Rust
49 lines
831 B
Rust
// check-pass
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#![feature(return_position_impl_trait_in_trait)]
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#![allow(incomplete_features)]
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use std::fmt::Debug;
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trait Foo {
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fn foo(&self) -> impl Debug;
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}
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impl Foo for () {
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fn foo(&self) -> impl Debug {
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"Hello, world"
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}
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}
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impl<T: Default + Debug> Foo for std::marker::PhantomData<T> {
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fn foo(&self) -> impl Debug {
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T::default()
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}
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}
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trait Bar {
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fn bar<T>(&self) -> impl Debug;
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}
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impl Bar for () {
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fn bar<T>(&self) -> impl Debug {
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format!("Hello with generic {}", std::any::type_name::<T>())
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}
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}
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trait Baz {
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fn baz(&self) -> impl Debug + '_;
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}
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impl Baz for String {
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fn baz(&self) -> impl Debug + '_ {
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(self,)
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}
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}
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fn main() {
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println!("{:?}", ().foo());
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println!("{:?}", ().bar::<u64>());
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println!("{:?}", "hi".to_string().baz());
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}
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