diff options
Diffstat (limited to 'tests/ui/associated-types/associated-types-incomplete-object.rs')
-rw-r--r-- | tests/ui/associated-types/associated-types-incomplete-object.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/associated-types/associated-types-incomplete-object.rs b/tests/ui/associated-types/associated-types-incomplete-object.rs new file mode 100644 index 000000000..4627dfd2b --- /dev/null +++ b/tests/ui/associated-types/associated-types-incomplete-object.rs @@ -0,0 +1,31 @@ +// Check that the user gets an error if they omit a binding from an +// object type. + +pub trait Foo { + type A; + type B; + fn boo(&self) -> <Self as Foo>::A; +} + +struct Bar; + +impl Foo for isize { + type A = usize; + type B = char; + fn boo(&self) -> usize { + 42 + } +} + +pub fn main() { + let a = &42isize as &dyn Foo<A=usize, B=char>; + + let b = &42isize as &dyn Foo<A=usize>; + //~^ ERROR the value of the associated type `B` (from trait `Foo`) must be specified + + let c = &42isize as &dyn Foo<B=char>; + //~^ ERROR the value of the associated type `A` (from trait `Foo`) must be specified + + let d = &42isize as &dyn Foo; + //~^ ERROR the value of the associated types `A` (from trait `Foo`), `B` (from trait +} |