rust/tests/ui/issues/issue-28550.rs
2023-01-11 09:32:08 +00:00

17 lines
323 B
Rust

// run-pass
struct A<F: FnOnce()->T,T>(F::Output);
struct B<F: FnOnce()->T,T>(A<F,T>);
// Removing Option causes it to compile.
fn foo<T,F: FnOnce()->T>(f: F) -> Option<B<F,T>> {
Some(B(A(f())))
}
fn main() {
let v = (|| foo(||4))();
match v {
Some(B(A(4))) => {},
_ => unreachable!()
}
}