// Copyright 2018 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. fn foo(_: impl for<'a> FnOnce(&'a u32, &u32) -> &'a u32) { } fn main() { foo(|a, b| b) //~^ ERROR lifetime of reference outlives lifetime of borrowed content... }