57 lines
1.3 KiB
Rust
57 lines
1.3 KiB
Rust
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#![feature(fn_delegation)]
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#![allow(incomplete_features)]
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mod default_param {
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pub trait Trait<T = u32> {
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fn foo(&self, _: T) {}
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}
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impl<T> Trait<T> for u8 {}
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}
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mod types_and_lifetimes {
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pub trait Trait<'a, T> {
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fn foo<'b: 'b>(&'a self, x: &'b T) {
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loop {}
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}
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}
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impl<'a, T> Trait<'a, T> for u8 {}
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}
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mod bounds {
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pub trait Trait<T> {
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fn foo<U: Clone>(&self, t: T, u: U) where T: Copy {}
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}
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impl<T> Trait<T> for u8 {}
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}
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mod generic_arguments {
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trait Trait<T> {
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fn foo<U>(&self, _: U, _: T) {}
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}
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impl<T> Trait<T> for u8 {}
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reuse Trait::<_>::foo::<i32> as generic_arguments1;
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//~^ ERROR mismatched types
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reuse <u8 as Trait<_>>::foo as generic_arguments2;
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//~^ ERROR mismatched types
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reuse <_ as Trait<_>>::foo as generic_arguments3; // OK
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}
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reuse default_param::Trait::foo as default_param;
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reuse types_and_lifetimes::Trait::foo as types_and_lifetimes;
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reuse bounds::Trait::foo as bounds;
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fn main() {
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default_param(&0u8, "hello world"); // OK, default params are not substituted
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types_and_lifetimes::<'static, 'static, _, _>(&0u8, &0u16); // OK, lifetimes go first
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struct S;
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struct U;
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bounds(&0u8, S, U);
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//~^ ERROR the trait bound `S: Copy` is not satisfied
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//~| ERROR the trait bound `U: Clone` is not satisfied
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}
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