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// Regression test for issue #57642
// Tests that we reject a bad higher-ranked subtype
trait X {
type G;
fn make_g() -> Self::G;
}
impl<'a> X for fn(&'a ()) {
type G = &'a ();
fn make_g() -> Self::G {
&()
}
}
trait Y {
type F;
fn make_f() -> Self::F;
}
impl<T> Y for fn(T) {
type F = fn(T);
fn make_f() -> Self::F {
|_| {}
}
}
fn higher_ranked_region_has_lost_its_binder() {
let x = <fn (&())>::make_g(); //~ ERROR the function
}
fn magical() {
let x = <fn (&())>::make_f(); //~ ERROR no function
}
fn main() {}
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