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// Test that the NLL `relate_tys` code correctly deduces that a
// function returning always its first argument can be upcast to one
// that returns either first or second argument.
//
// check-pass
// compile-flags:-Zno-leak-check
fn make_it() -> for<'a, 'b> fn(&'a u32, &'b u32) -> &'a u32 {
panic!()
}
fn main() {
let a: for<'a> fn(&'a u32, &'a u32) -> &'a u32 = make_it();
drop(a);
}
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