diff options
Diffstat (limited to 'tests/ui/higher-ranked/trait-bounds/hrtb-conflate-regions.rs')
-rw-r--r-- | tests/ui/higher-ranked/trait-bounds/hrtb-conflate-regions.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/higher-ranked/trait-bounds/hrtb-conflate-regions.rs b/tests/ui/higher-ranked/trait-bounds/hrtb-conflate-regions.rs new file mode 100644 index 000000000..e83686404 --- /dev/null +++ b/tests/ui/higher-ranked/trait-bounds/hrtb-conflate-regions.rs @@ -0,0 +1,31 @@ +// Test that an impl with only one bound region `'a` cannot be used to +// satisfy a constraint where there are two bound regions. + +trait Foo<X> { + fn foo(&self, x: X) { } +} + +fn want_foo2<T>() + where T : for<'a,'b> Foo<(&'a isize, &'b isize)> +{ +} + +fn want_foo1<T>() + where T : for<'z> Foo<(&'z isize, &'z isize)> +{ +} + +// Expressed as a where clause + +struct SomeStruct; + +impl<'a> Foo<(&'a isize, &'a isize)> for SomeStruct +{ +} + +fn a() { want_foo1::<SomeStruct>(); } // OK -- foo wants just one region +fn b() { want_foo2::<SomeStruct>(); } +//~^ ERROR implementation of +//~| ERROR implementation of + +fn main() { } |