// 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. #![feature(trace_macros)] fn main() { trace_macros!(); //~ ERROR trace_macros! accepts only `true` or `false` trace_macros!(1); //~ ERROR trace_macros! accepts only `true` or `false` trace_macros!(ident); //~ ERROR trace_macros! accepts only `true` or `false` trace_macros!(for); //~ ERROR trace_macros! accepts only `true` or `false` trace_macros!(true,); //~ ERROR trace_macros! accepts only `true` or `false` trace_macros!(false 1); //~ ERROR trace_macros! accepts only `true` or `false` // should be fine: macro_rules! expando { ($x: ident) => { trace_macros!($x) } } expando!(true); }