bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

[RFC-3086] Restrict the parsing of count

Browse source
This commit is contained in:
Caio 2023-08-17 08:52:37 -03:00
parent d4a881e143
commit 6395dc2cde
3 changed files with 44 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

12
compiler/rustc_expand/src/mbe/metavar_expr.rs
View file

@ -93,7 +93,17 @@ fn parse_count<'sess>(
span: Span,
) -> PResult<'sess, MetaVarExpr> {
let ident = parse_ident(iter, sess, span)?;
let depth = if try_eat_comma(iter) { Some(parse_depth(iter, sess, span)?) } else { None };
let depth = if try_eat_comma(iter) {
if iter.look_ahead(0).is_none() {
return Err(sess.span_diagnostic.struct_span_err(
span,
"`count` followed by a comma must have an associated index indicating its depth",
));
}
Some(parse_depth(iter, sess, span)?)
} else {
None
};
Ok(MetaVarExpr::Count(ident, depth))
}