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Remove outdated comment.

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All nonterminals collect and store tokens now. (Unless they are very
simple, e.g. single-token, and can precisely recover them without
collecting.)
This commit is contained in:
Nicholas Nethercote 2023-08-04 11:02:35 +10:00
parent 9de696b39f
commit 434bfc3162
1 changed files with 0 additions and 2 deletions
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compiler/rustc_parse/src/parser/nonterminal.rs
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@ -101,8 +101,6 @@ fn may_be_ident(nt: &token::Nonterminal) -> bool {
/// site. /// site.
#[inline] #[inline]
pub fn parse_nonterminal(&mut self, kind: NonterminalKind) -> PResult<'a, NtOrTt> { pub fn parse_nonterminal(&mut self, kind: NonterminalKind) -> PResult<'a, NtOrTt> {
// Any `Nonterminal` which stores its tokens (currently `NtItem` and `NtExpr`)
// needs to have them force-captured here.
// A `macro_rules!` invocation may pass a captured item/expr to a proc-macro, // A `macro_rules!` invocation may pass a captured item/expr to a proc-macro,
// which requires having captured tokens available. Since we cannot determine // which requires having captured tokens available. Since we cannot determine
// in advance whether or not a proc-macro will be (transitively) invoked, // in advance whether or not a proc-macro will be (transitively) invoked,