mathieu/granite-rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Add a useful assertion.

Browse source
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
Show stats Download patch file Download diff file Expand all files Collapse all files

9
compiler/rustc_expand/src/mbe/macro_parser.rs
View file

@ -588,8 +588,13 @@ impl<'tt> TtParser<'tt> {
if *token == token::Eof {
Some(match eof_items {
EofItems::One(mut eof_item) => {
let matches =
eof_item.matches.iter_mut().map(|dv| Lrc::make_mut(dv).pop().unwrap());
let matches = eof_item.matches.iter_mut().map(|dv| {
// 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)
}
EofItems::Multiple => {