bjoernager/rust
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pin_ergonomics: allow reborrowing as Pin<&T>

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This commit is contained in:
Eric Holk 2024-09-19 16:27:09 -07:00
parent 92a5d21bc4
commit a18800f807
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5 changed files with 70 additions and 15 deletions
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15
compiler/rustc_mir_build/src/thir/cx/expr.rs
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@ -181,22 +181,25 @@ impl<'tcx> Cx<'tcx> {
});
// expr = &mut target
let borrow_kind = match mutbl {
hir::Mutability::Mut => BorrowKind::Mut { kind: mir::MutBorrowKind::Default },
hir::Mutability::Not => BorrowKind::Shared,
};
let new_pin_target = Ty::new_ref(self.tcx, region, ptr_target_ty, mutbl);
let expr = self.thir.exprs.push(Expr {
temp_lifetime,
ty: Ty::new_ref(self.tcx, region, ptr_target_ty, mutbl),
ty: new_pin_target,
span,
kind: ExprKind::Borrow {
borrow_kind: BorrowKind::Mut { kind: mir::MutBorrowKind::Default },
arg,
},
kind: ExprKind::Borrow { borrow_kind, arg },
});
// kind = Pin { __pointer: pointer }
let pin_did = self.tcx.require_lang_item(rustc_hir::LangItem::Pin, Some(span));
let args = self.tcx.mk_args(&[new_pin_target.into()]);
let kind = ExprKind::Adt(Box::new(AdtExpr {
adt_def: self.tcx.adt_def(pin_did),
variant_index: FIRST_VARIANT,
args: pin_ty_args,
args,
fields: Box::new([FieldExpr { name: FieldIdx::from(0u32), expr }]),
user_ty: None,
base: None,