rust/src/comp/syntax/ext/log_syntax.rs

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import std::option;
import base::*;
import syntax::ast;
fn expand_syntax_ext(cx: &ext_ctxt, sp: codemap::span, arg: @ast::expr,
body: option::t[str]) -> @ast::expr {
cx.print_backtrace();
std::io::stdout().write_line(print::pprust::expr_to_str(arg));
//trivial expression
ret @{id: cx.next_id(), node: ast::expr_rec(~[], option::none), span: sp};
}