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Implement pinned borrows, part of pin_ergonomics

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This commit is contained in:
Frank King
2025-01-19 22:01:11 +08:00
parent 49a8ba0684
commit e627f88f88
18 changed files with 471 additions and 18 deletions
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7
compiler/rustc_parse/src/parser/expr.rs
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@@ -847,7 +847,7 @@ impl<'a> Parser<'a> {
self.dcx().emit_err(errors::LifetimeInBorrowExpression { span, lifetime_span: lt_span });
}
/// Parse `mut?` or `raw [ const | mut ]`.
/// Parse `mut?` or `[ raw | pin ] [ const | mut ]`.
fn parse_borrow_modifiers(&mut self) -> (ast::BorrowKind, ast::Mutability) {
if self.check_keyword(exp!(Raw)) && self.look_ahead(1, Token::is_mutability) {
// `raw [ const | mut ]`.
@@ -855,6 +855,11 @@ impl<'a> Parser<'a> {
assert!(found_raw);
let mutability = self.parse_const_or_mut().unwrap();
(ast::BorrowKind::Raw, mutability)
} else if let Some((ast::Pinnedness::Pinned, mutbl)) = self.parse_pin_and_mut() {
// `pin [ const | mut ]`.
// `pin` has been gated in `self.parse_pin_and_mut()` so we don't
// need to gate it here.
(ast::BorrowKind::Pin, mutbl)
} else {
// `mut?`
(ast::BorrowKind::Ref, self.parse_mutability())