bjoernager/rust
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Parsing unsafe binders

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This commit is contained in:
Michael Goulet 2024-08-30 17:01:28 -04:00
parent 8e37e15183
commit 3b1adfa94b
6 changed files with 45 additions and 1 deletions
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17
compiler/rustc_parse/src/parser/ty.rs
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@ -5,7 +5,7 @@ use rustc_ast::{
self as ast, BareFnTy, BoundAsyncness, BoundConstness, BoundPolarity, DUMMY_NODE_ID, FnRetTy,
GenericBound, GenericBounds, GenericParam, Generics, Lifetime, MacCall, MutTy, Mutability,
Pinnedness, PolyTraitRef, PreciseCapturingArg, TraitBoundModifiers, TraitObjectSyntax, Ty,
TyKind,
TyKind, UnsafeBinderTy,
};
use rustc_errors::{Applicability, PResult};
use rustc_span::symbol::{Ident, kw, sym};
@ -348,6 +348,8 @@ impl<'a> Parser<'a> {
TyKind::Err(guar)
}
}
} else if self.check_keyword(kw::Unsafe) {
self.parse_unsafe_binder_ty()?
} else {
let msg = format!("expected type, found {}", super::token_descr(&self.token));
let mut err = self.dcx().struct_span_err(lo, msg);
@ -369,6 +371,19 @@ impl<'a> Parser<'a> {
if allow_qpath_recovery { self.maybe_recover_from_bad_qpath(ty) } else { Ok(ty) }
}
fn parse_unsafe_binder_ty(&mut self) -> PResult<'a, TyKind> {
let lo = self.token.span;
assert!(self.eat_keyword(kw::Unsafe));
self.expect_lt()?;
let generic_params = self.parse_generic_params()?;
self.expect_gt()?;
let inner_ty = self.parse_ty()?;
let span = lo.to(self.prev_token.span);
self.psess.gated_spans.gate(sym::unsafe_binders, span);
Ok(TyKind::UnsafeBinder(P(UnsafeBinderTy { generic_params, inner_ty })))
}
/// Parses either:
/// - `(TYPE)`, a parenthesized type.
/// - `(TYPE,)`, a tuple with a single field of type TYPE.