1 // Test that `impl MyTrait for Foo<'_>` works. 2 3 // run-pass 4 5 #![allow(warnings)] 6 7 trait MyTrait { } 8 9 struct Foo<'a> { x: &'a u32 } 10 11 impl MyTrait for Foo<'_> { 12 } 13 impls_my_trait<T: MyTrait>()14fn impls_my_trait<T: MyTrait>() { } 15 impls_my_trait_val<T: MyTrait>(_: T)16fn impls_my_trait_val<T: MyTrait>(_: T) { 17 impls_my_trait::<T>(); 18 } 19 random_where_clause() where for<'a> Foo<'a>: MyTrait20fn random_where_clause() 21 where for<'a> Foo<'a>: MyTrait { } 22 main()23fn main() { 24 let x = 22; 25 let f = Foo { x: &x }; 26 27 // This type is `Foo<'x>` for a local lifetime `'x`; so the impl 28 // must apply to any lifetime to apply to this. 29 impls_my_trait_val(f); 30 31 impls_my_trait::<Foo<'static>>(); 32 33 random_where_clause(); 34 } 35