rust/src/libsyntax/ext/log_syntax.rs

// 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 ext::base::*;
use io::WriterUtil;

fn expand_syntax_ext(cx: ext_ctxt, sp: codemap::span, tt: ~[ast::token_tree])
    -> base::mac_result {

    cx.print_backtrace();
    io::stdout().write_line(
        print::pprust::tt_to_str(ast::tt_delim(tt),cx.parse_sess().interner));

    //trivial expression
    return mr_expr(@{id: cx.next_id(), callee_id: cx.next_id(),
                     node: ast::expr_rec(~[], option::None), span: sp});
}