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use syntax::ext::base;
use syntax::feature_gate;
use syntax::print;
use syntax::tokenstream;
use syntax_pos;
pub fn expand_syntax_ext<'cx>(cx: &'cx mut base::ExtCtxt,
sp: syntax_pos::Span,
tts: &[tokenstream::TokenTree])
-> Box<base::MacResult + 'cx> {
if !cx.ecfg.enable_log_syntax() {
feature_gate::emit_feature_err(&cx.parse_sess,
"log_syntax",
sp,
feature_gate::GateIssue::Language,
feature_gate::EXPLAIN_LOG_SYNTAX);
return base::DummyResult::any(sp);
}
println!("{}", print::pprust::tts_to_string(tts));
base::DummyResult::any(sp)
}