// 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. #![allow(stable_features)] #![feature(rust1)] #![feature(rust1)] //~ ERROR the feature `rust1` has already been declared #![feature(if_let)] #![feature(if_let)] //~ ERROR the feature `if_let` has already been declared fn main() {}