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#![feature(type_alias_impl_trait)]
// check-pass
trait Duh {}
impl Duh for i32 {}
trait Trait {
type Assoc: Duh;
}
// the fact that `R` is the `::Output` projection on `F` causes
// an intermediate inference var to be generated which is then later
// compared against the actually found `Assoc` type.
impl<R: Duh, F: FnMut() -> R> Trait for F {
type Assoc = R;
}
type Sendable = impl Send;
// The `Sendable` here is converted to an inference var and then later compared
// against the inference var created, causing the inference var to be set to
// the hidden type of `Sendable` instead of
// the hidden type. We already have obligations registered on the inference
// var to make it uphold the `: Duh` bound on `Trait::Assoc`. The opaque
// type does not implement `Duh`, but if its hidden type does.
fn foo() -> impl Trait<Assoc = Sendable> {
|| 42
}
fn main() {
}
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