diff options
Diffstat (limited to 'src/test/ui/impl-header-lifetime-elision/path-underscore.rs')
-rw-r--r-- | src/test/ui/impl-header-lifetime-elision/path-underscore.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/impl-header-lifetime-elision/path-underscore.rs b/src/test/ui/impl-header-lifetime-elision/path-underscore.rs new file mode 100644 index 000000000..f39ba5733 --- /dev/null +++ b/src/test/ui/impl-header-lifetime-elision/path-underscore.rs @@ -0,0 +1,34 @@ +// Test that `impl MyTrait for Foo<'_>` works. + +// run-pass + +#![allow(warnings)] + +trait MyTrait { } + +struct Foo<'a> { x: &'a u32 } + +impl MyTrait for Foo<'_> { +} + +fn impls_my_trait<T: MyTrait>() { } + +fn impls_my_trait_val<T: MyTrait>(_: T) { + impls_my_trait::<T>(); +} + +fn random_where_clause() +where for<'a> Foo<'a>: MyTrait { } + +fn main() { + let x = 22; + let f = Foo { x: &x }; + + // This type is `Foo<'x>` for a local lifetime `'x`; so the impl + // must apply to any lifetime to apply to this. + impls_my_trait_val(f); + + impls_my_trait::<Foo<'static>>(); + + random_where_clause(); +} |