diff options
Diffstat (limited to 'tests/ui/impl-trait/two_tait_defining_each_other.rs')
-rw-r--r-- | tests/ui/impl-trait/two_tait_defining_each_other.rs | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/two_tait_defining_each_other.rs b/tests/ui/impl-trait/two_tait_defining_each_other.rs new file mode 100644 index 000000000..6eb2a11b2 --- /dev/null +++ b/tests/ui/impl-trait/two_tait_defining_each_other.rs @@ -0,0 +1,19 @@ +#![feature(type_alias_impl_trait)] + +type A = impl Foo; +type B = impl Foo; + +trait Foo {} + +fn muh(x: A) -> B { + if false { + return Bar; // B's hidden type is Bar + } + x // A's hidden type is `Bar`, because all the hidden types of `B` are compared with each other + //~^ ERROR opaque type's hidden type cannot be another opaque type +} + +struct Bar; +impl Foo for Bar {} + +fn main() {} |