| // 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 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<dyn 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)); |
| |
| // any so that `log_syntax` can be invoked as an expression and item. |
| base::DummyResult::any(sp) |
| } |