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Rollup merge of #129969 - GrigorenkoPV:boxed-ty, r=compiler-errors

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Make `Ty::boxed_ty` return an `Option`

Looks like a good place to use Rust's type system.

---

Most of 4ac7bcbaad/compiler/rustc_middle/src/ty/sty.rs (L971-L1963) looks like it could be moved to `TyKind` (then I guess  `Ty` should be made to deref to `TyKind`).
This commit is contained in:
Matthias Krüger 2024-09-06 07:33:58 +02:00 • committed by GitHub
commit 0180b8fff0
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21 changed files with 58 additions and 48 deletions
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12
compiler/rustc_mir_transform/src/elaborate_box_derefs.rs
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@ -62,11 +62,13 @@ impl<'tcx, 'a> MutVisitor<'tcx> for ElaborateBoxDerefVisitor<'tcx, 'a> {
let base_ty = self.local_decls[place.local].ty;
// Derefer ensures that derefs are always the first projection
if place.projection.first() == Some(&PlaceElem::Deref) && base_ty.is_box() {
if let Some(PlaceElem::Deref) = place.projection.first()
&& let Some(boxed_ty) = base_ty.boxed_ty()
{
let source_info = self.local_decls[place.local].source_info;
let (unique_ty, nonnull_ty, ptr_ty) =
build_ptr_tys(tcx, base_ty.boxed_ty(), self.unique_did, self.nonnull_did);
build_ptr_tys(tcx, boxed_ty, self.unique_did, self.nonnull_did);
let ptr_local = self.patch.new_temp(ptr_ty, source_info.span);
@ -120,13 +122,15 @@ impl<'tcx> crate::MirPass<'tcx> for ElaborateBoxDerefs {
for (base, elem) in place.iter_projections() {
let base_ty = base.ty(&body.local_decls, tcx).ty;
if elem == PlaceElem::Deref && base_ty.is_box() {
if let PlaceElem::Deref = elem
&& let Some(boxed_ty) = base_ty.boxed_ty()
{
// Clone the projections before us, since now we need to mutate them.
let new_projections =
new_projections.get_or_insert_with(|| base.projection.to_vec());
let (unique_ty, nonnull_ty, ptr_ty) =
build_ptr_tys(tcx, base_ty.boxed_ty(), unique_did, nonnull_did);
build_ptr_tys(tcx, boxed_ty, unique_did, nonnull_did);
new_projections.extend_from_slice(&build_projection(
unique_ty, nonnull_ty, ptr_ty,