rust/src/test/compile-fail/trace_macros-gate.rs

// 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.

// Test that the trace_macros feature gate is on.

fn main() {
    trace_macros!(); //~ ERROR `trace_macros` is not stable
    trace_macros!(1); //~ ERROR `trace_macros` is not stable
    trace_macros!(ident); //~ ERROR `trace_macros` is not stable
    trace_macros!(for); //~ ERROR `trace_macros` is not stable
    trace_macros!(true,); //~ ERROR `trace_macros` is not stable
    trace_macros!(false 1); //~ ERROR `trace_macros` is not stable

    // Errors are signalled early for the above, before expansion.
    // See trace_macros-gate2 and trace_macros-gate3. for examples
    // of the below being caught.

    macro_rules! expando {
        ($x: ident) => { trace_macros!($x) } //~ ERROR `trace_macros` is not stable
    }

    expando!(true);
}