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// Tests that we correctly handle opaque types being used opaquely,
// even within their defining scope.
//
#![feature(type_alias_impl_trait)]
type Foo = impl Copy;
enum Wrapper<T> {
First(T),
Second,
}
// This method constrains `Foo` to be `bool`
#[define_opaque(Foo)]
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.
#[define_opaque(Foo)]
fn unconstrained_foo() -> Wrapper<Foo> {
Wrapper::Second
//~^ ERROR: type annotations needed
}
fn main() {}
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