// Copyright 2017 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. #![feature(underscore_lifetimes)] struct Foo<'a>(&'a u8); fn foo<'_> //~ ERROR invalid lifetime parameter name: `'_` (_: Foo<'_>) {} trait Meh<'a> {} impl<'a> Meh<'a> for u8 {} fn meh() -> Box Meh<'_>> //~ ERROR invalid lifetime parameter name: `'_` //~^ ERROR missing lifetime specifier //~^^ ERROR missing lifetime specifier { Box::new(5u8) } fn main() { let x = 5; foo(Foo(&x)); let _ = meh(); }