diff options
Diffstat (limited to 'src/test/ui/associated-types/associated-types-return.rs')
-rw-r--r-- | src/test/ui/associated-types/associated-types-return.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/associated-types-return.rs b/src/test/ui/associated-types/associated-types-return.rs new file mode 100644 index 000000000..997a48b03 --- /dev/null +++ b/src/test/ui/associated-types/associated-types-return.rs @@ -0,0 +1,46 @@ +// run-pass +// Test equality constraints on associated types in a where clause. + + +pub trait Foo { + type A; + fn boo(&self) -> <Self as Foo>::A; +} + +#[derive(PartialEq, Debug)] +pub struct Bar; + +impl Foo for isize { + type A = usize; + fn boo(&self) -> usize { 42 } +} + +impl Foo for Bar { + type A = isize; + fn boo(&self) -> isize { 43 } +} + +impl Foo for char { + type A = Bar; + fn boo(&self) -> Bar { Bar } +} + +fn foo1<I: Foo<A=Bar>>(x: I) -> Bar { + x.boo() +} + +fn foo2<I: Foo>(x: I) -> <I as Foo>::A { + x.boo() +} + +pub fn main() { + let a = 42; + assert_eq!(foo2(a), 42); + + let a = Bar; + assert_eq!(foo2(a), 43); + + let a = 'a'; + foo1(a); + assert_eq!(foo2(a), Bar); +} |