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fix parser mistaking const closures for const item

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This commit is contained in:
Deadbeef 2023-02-01 05:55:48 +00:00
parent ad8e1dc286
commit 679dde7338
5 changed files with 30 additions and 9 deletions
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21
compiler/rustc_parse/src/parser/mod.rs
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@ -739,9 +739,10 @@ impl<'a> Parser<'a> {
fn check_const_closure(&self) -> bool {
self.is_keyword_ahead(0, &[kw::Const])
&& self.look_ahead(1, |t| match &t.kind {
token::Ident(kw::Move | kw::Static | kw::Async, _)
| token::OrOr
| token::BinOp(token::Or) => true,
// async closures do not work with const closures, so we do not parse that here.
token::Ident(kw::Move | kw::Static, _) | token::OrOr | token::BinOp(token::Or) => {
true
}
_ => false,
})
}
@ -1203,8 +1204,18 @@ impl<'a> Parser<'a> {
/// Parses constness: `const` or nothing.
fn parse_constness(&mut self, case: Case) -> Const {
// Avoid const blocks to be parsed as const items
if self.look_ahead(1, |t| t != &token::OpenDelim(Delimiter::Brace))
self.parse_constness_(case, false)
}
/// Parses constness for closures
fn parse_closure_constness(&mut self, case: Case) -> Const {
self.parse_constness_(case, true)
}
fn parse_constness_(&mut self, case: Case, is_closure: bool) -> Const {
// Avoid const blocks and const closures to be parsed as const items
if (self.check_const_closure() == is_closure)
&& self.look_ahead(1, |t| t != &token::OpenDelim(Delimiter::Brace))
&& self.eat_keyword_case(kw::Const, case)
{
Const::Yes(self.prev_token.uninterpolated_span())