src/libsyntax_ext/log_syntax.rs

   1 use syntax::ext::base;
   2 use syntax::print;
   3 use syntax::tokenstream::TokenStream;
   4 use syntax_pos;
   5
   6 pub fn expand_log_syntax<'cx>(_cx: &'cx mut base::ExtCtxt<'_>,
   7                               sp: syntax_pos::Span,
   8                               tts: TokenStream)
   9                               -> Box<dyn base::MacResult + 'cx> {
  10     println!("{}", print::pprust::tts_to_string(tts));
  11
  12     // any so that `log_syntax` can be invoked as an expression and item.
  13     base::DummyResult::any_valid(sp)
  14 }