/
log_syntax.rs
35 lines (30 loc) · 1.24 KB
/
log_syntax.rs
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// Copyright 2012 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.
use ast;
use codemap;
use ext::base;
use feature_gate;
use print;
pub fn expand_syntax_ext<'cx>(cx: &'cx mut base::ExtCtxt,
sp: codemap::Span,
tts: &[ast::TokenTree])
-> Box<base::MacResult+'cx> {
if !cx.ecfg.enable_log_syntax() {
feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,
"log_syntax",
sp,
feature_gate::EXPLAIN_LOG_SYNTAX);
return base::DummyResult::any(sp);
}
cx.print_backtrace();
println!("{}", print::pprust::tts_to_string(tts));
// any so that `log_syntax` can be invoked as an expression and item.
base::DummyResult::any(sp)
}