// Copyright 2014 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. // no-pretty-expanded #![allow(unused_must_use, dead_code)] #![feature(macro_rules)] use std::io::MemWriter; struct Foo<'a> { writer: &'a mut Writer, other: &'a str, } fn borrowing_writer_from_struct_and_formatting_struct_field(foo: Foo) { write!(foo.writer, "{}", foo.other); } fn main() { let mut w = MemWriter::new(); write!(&mut w as &mut Writer, ""); write!(&mut w, ""); // should coerce println!("ok"); }