44 lines
722 B
Rust
44 lines
722 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::Display;
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trait Foo {
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fn bar(&self) -> impl Display;
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}
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impl Foo for i32 {
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#[allow(refining_impl_trait)]
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fn bar(&self) -> i32 {
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*self
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}
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}
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impl Foo for &'static str {
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#[allow(refining_impl_trait)]
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fn bar(&self) -> &'static str {
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*self
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}
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}
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struct Yay;
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impl Foo for Yay {
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#[allow(refining_impl_trait)]
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fn bar(&self) -> String {
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String::from(":^)")
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}
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}
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fn foo_generically<T: Foo>(t: T) {
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println!("{}", t.bar());
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}
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fn main() {
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println!("{}", "Hello, world.".bar());
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println!("The answer is {}!", 42.bar());
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foo_generically(Yay);
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}
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