// Copyright 2016 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(coerce_unsized)] use std::ops::CoerceUnsized; struct Foo { a: T, } impl CoerceUnsized for Foo {} //~ ERROR E0376 fn main() {}