src/test/ui/nll/relate_tys/fn-subtype.rs

// Test that NLL produces correct spans for higher-ranked subtyping errors.
//
// compile-flags:-Zno-leak-check

#![feature(nll)]

fn main() {
    let x: fn(&'static ()) = |_| {};
    let y: for<'a> fn(&'a ()) = x; //~ ERROR higher-ranked subtype error
}