| // Copyright 2015 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 <LICENSE-APACHE or | 
 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | 
 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | 
 | // option. This file may not be copied, modified, or distributed | 
 | // except according to those terms. | 
 |  | 
 | // aux-build:issue-19163.rs | 
 |  | 
 | #[macro_use] extern crate issue_19163; | 
 |  | 
 | use std::io::Write; | 
 |  | 
 | fn main() { | 
 |     let mut v = vec![]; | 
 |     mywrite!(&v, "Hello world"); | 
 |  //~^ error: cannot borrow immutable borrowed content as mutable | 
 | } |