dc0797c0c9
The other cases: `concat_idents!`, `log_syntax!`, and `trace_macros!`, (these macros, with `asm!`, are handled (eagerly) in feature_gate.rs).
43 lines
1.5 KiB
Rust
43 lines
1.5 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast;
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use codemap::Span;
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use ext::base::ExtCtxt;
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use ext::base;
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use feature_gate;
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use parse::token::keywords;
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pub fn expand_trace_macros(cx: &mut ExtCtxt,
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sp: Span,
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tt: &[ast::TokenTree])
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-> Box<base::MacResult+'static> {
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if !cx.ecfg.enable_trace_macros() {
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feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,
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"trace_macros",
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sp,
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feature_gate::EXPLAIN_TRACE_MACROS);
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return base::DummyResult::any(sp);
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}
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match tt {
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[ast::TtToken(_, ref tok)] if tok.is_keyword(keywords::True) => {
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cx.set_trace_macros(true);
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}
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[ast::TtToken(_, ref tok)] if tok.is_keyword(keywords::False) => {
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cx.set_trace_macros(false);
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}
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_ => cx.span_err(sp, "trace_macros! accepts only `true` or `false`"),
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}
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base::DummyResult::any(sp)
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}
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