| // Tests that we correctly handle the instantiated |
| // inference variable being completely unconstrained. |
| // |
| // check-pass |
| #![feature(type_alias_impl_trait)] |
| |
| type Foo = impl Copy; |
| |
| enum Wrapper<T> { |
| First(T), |
| Second |
| } |
| |
| // This method constrains `Foo` to be `bool` |
| fn constrained_foo() -> Foo { |
| true |
| } |
| |
| |
| // This method does not constrain `Foo`. |
| // Per RFC 2071, function bodies may either |
| // fully constrain an opaque type, or place no |
| // constraints on it. |
| fn unconstrained_foo() -> Wrapper<Foo> { |
| Wrapper::Second |
| } |
| |
| fn main() {} |
