Function rustc_expand::mbe::macro_rules::check_lhs_no_empty_seq
source ยท fn check_lhs_no_empty_seq(
sess: &Session,
tts: &[TokenTree],
) -> Result<(), ErrorGuaranteed>
Expand description
Checks that the lhs contains no repetition which could match an empty token tree, because then the matcher would hang indefinitely.