24 lines
865 B
Rust
24 lines
865 B
Rust
use syntax::ext::base;
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use syntax::feature_gate;
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use syntax::print;
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use syntax::tokenstream;
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use syntax_pos;
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pub fn expand_syntax_ext<'cx>(cx: &'cx mut base::ExtCtxt<'_>,
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sp: syntax_pos::Span,
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tts: &[tokenstream::TokenTree])
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-> Box<dyn base::MacResult + 'cx> {
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if !cx.ecfg.enable_log_syntax() {
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feature_gate::emit_feature_err(&cx.parse_sess,
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"log_syntax",
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sp,
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feature_gate::GateIssue::Language,
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feature_gate::EXPLAIN_LOG_SYNTAX);
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}
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println!("{}", print::pprust::tts_to_string(tts));
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// any so that `log_syntax` can be invoked as an expression and item.
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base::DummyResult::any_valid(sp)
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}
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