File: issue-63279.rs

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rustc 1.88.0%2Bdfsg1-1
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#![feature(type_alias_impl_trait)]

type Closure = impl FnOnce();

#[define_opaque(Closure)]
fn c() -> Closure {
    //~^ ERROR: expected a `FnOnce()` closure, found `()`
    || -> Closure { || () }
    //~^ ERROR: mismatched types
    //~| ERROR: mismatched types
    //~| ERROR: expected a `FnOnce()` closure, found `()`
}

fn main() {}