21 lines
698 B
Rust
21 lines
698 B
Rust
use syntax::ext::base::{self, ExtCtxt};
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use syntax::symbol::kw;
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use syntax_pos::Span;
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use syntax::tokenstream::TokenTree;
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pub fn expand_trace_macros(cx: &mut ExtCtxt<'_>,
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sp: Span,
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tt: &[TokenTree])
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-> Box<dyn base::MacResult + 'static> {
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match tt {
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[TokenTree::Token(token)] if token.is_keyword(kw::True) => {
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cx.set_trace_macros(true);
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}
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[TokenTree::Token(token)] if token.is_keyword(kw::False) => {
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cx.set_trace_macros(false);
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}
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_ => cx.span_err(sp, "trace_macros! accepts only `true` or `false`"),
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}
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base::DummyResult::any_valid(sp)
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}
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