diff options
Diffstat (limited to 'src/test/ui/higher-rank-trait-bounds/hrtb-type-outlives.rs')
-rw-r--r-- | src/test/ui/higher-rank-trait-bounds/hrtb-type-outlives.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/higher-rank-trait-bounds/hrtb-type-outlives.rs b/src/test/ui/higher-rank-trait-bounds/hrtb-type-outlives.rs new file mode 100644 index 000000000..88d396101 --- /dev/null +++ b/src/test/ui/higher-rank-trait-bounds/hrtb-type-outlives.rs @@ -0,0 +1,46 @@ +// run-pass +#![allow(dead_code)] +#![allow(unused_variables)] +// Test what happens when a HR obligation is applied to an impl with +// "outlives" bounds. Currently we're pretty conservative here; this +// will probably improve in time. + +trait Foo<X> { + fn foo(&self, x: X) { } +} + +fn want_foo<T>() + where T : for<'a> Foo<&'a isize> +{ +} + +// Expressed as a where clause + +struct SomeStruct<X> { + x: X +} + +impl<'a,X> Foo<&'a isize> for SomeStruct<X> + where X : 'a +{ +} + +fn one() { + want_foo::<SomeStruct<usize>>(); +} + +// Expressed as shorthand + +struct AnotherStruct<X> { + x: X +} + +impl<'a,X:'a> Foo<&'a isize> for AnotherStruct<X> +{ +} + +fn two() { + want_foo::<AnotherStruct<usize>>(); +} + +fn main() { } |