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#![feature(type_alias_impl_trait)]
type Closure = impl FnOnce();
fn c() -> Closure {
//~^ ERROR: expected a `FnOnce()` closure, found `()`
|| -> Closure { || () }
//~^ ERROR: mismatched types
//~| ERROR: mismatched types
//~| ERROR: expected a `FnOnce()` closure, found `()`
}
fn main() {}
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