1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 use ext::base::ExtCtxt;
15 use parse::token::{keywords, is_keyword};
17 pub fn expand_trace_macros(cx: &mut ExtCtxt,
19 tt: &[ast::TokenTree])
22 [ast::TTTok(_, ref tok)] if is_keyword(keywords::True, tok) => {
23 cx.set_trace_macros(true);
25 [ast::TTTok(_, ref tok)] if is_keyword(keywords::False, tok) => {
26 cx.set_trace_macros(false);
28 _ => cx.span_err(sp, "trace_macros! accepts only `true` or `false`"),
31 base::MacResult::dummy_any(sp)