// Test that the NLL `relate_tys` code correctly deduces that a | |
// function returning either argument CANNOT be upcast to one | |
// that returns always its first argument. | |
// | |
//@ compile-flags:-Zno-leak-check | |
fn make_it() -> fn(&'static u32) -> &'static u32 { | |
panic!() | |
} | |
fn main() { | |
let a: fn(_) -> _ = make_it(); | |
let b: fn(&u32) -> &u32 = a; //~ ERROR mismatched types [E0308] | |
drop(a); | |
} |