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Diffstat (limited to '')
-rw-r--r-- | tests/ui/traits/assoc-type-in-superbad.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/traits/assoc-type-in-superbad.rs b/tests/ui/traits/assoc-type-in-superbad.rs new file mode 100644 index 000000000..65340b2a2 --- /dev/null +++ b/tests/ui/traits/assoc-type-in-superbad.rs @@ -0,0 +1,16 @@ +// Test case where an associated type is referenced from within the +// supertrait definition, and the impl makes the wrong +// associations. Issue #20220. + +use std::vec::IntoIter; + +pub trait Foo: Iterator<Item = <Self as Foo>::Key> { + type Key; +} + +impl Foo for IntoIter<i32> { + type Key = u32; + //~^ ERROR expected `IntoIter<i32>` to be an iterator that yields `u32`, but it yields `i32` +} + +fn main() {} |