bjoernager/rust
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Add a useful assertion.

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This commit is contained in:
Nicholas Nethercote 2022-03-25 15:32:34 +11:00
parent 600ec28483
commit df6ead557d
1 changed files with 7 additions and 2 deletions
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9
compiler/rustc_expand/src/mbe/macro_parser.rs
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@ -588,8 +588,13 @@ impl<'tt> TtParser<'tt> {
if *token == token::Eof { if *token == token::Eof {
Some(match eof_items { Some(match eof_items {
EofItems::One(mut eof_item) => { EofItems::One(mut eof_item) => {
let matches = let matches = eof_item.matches.iter_mut().map(|dv| {
eof_item.matches.iter_mut().map(|dv| Lrc::make_mut(dv).pop().unwrap()); // Top-level metavars only ever get one match. (Sub-matchers can get
// multiple matches, which get aggregated into a `MatcherSeq` before being
// put into the top-level.)
debug_assert_eq!(dv.len(), 1);
Lrc::make_mut(dv).pop().unwrap()
});
nameize(sess, ms, matches) nameize(sess, ms, matches)
} }
EofItems::Multiple => { EofItems::Multiple => {