src/test/ui/nll/mir_check_cast_closure.rs

// compile-flags: -Z borrowck=mir

#![allow(dead_code)]

fn bar<'a, 'b>() -> fn(&'a u32, &'b u32) -> &'a u32 {
    let g: fn(_, _) -> _ = |_x, y| y;
    g
    //~^ ERROR unsatisfied lifetime constraints
}

fn main() {}