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Explain special treatment for Dollar rule

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David Tolnay 2019-06-26 23:54:19 -07:00
parent 5d00016dfb
commit 1523cd7c1a
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src/token.rs
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@ -819,6 +819,7 @@ macro_rules! export_token_macro {
#[cfg(syn_can_match_trailing_dollar)]
export_token_macro![($)];
// Old rustc does not support ($) => {...} as a macro rule.
#[cfg(not(syn_can_match_trailing_dollar))]
export_token_macro![];