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Auto merge of #115025 - ouz-a:ouz_testing, r=lcnr

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Make subtyping explicit in MIR

This adds new mir-opt that pushes new `ProjectionElem` called `ProjectionElem::Subtype(T)` to `Rvalue` of a subtyped assignment so we can unsoundness issues like https://github.com/rust-lang/rust/issues/107205

Addresses https://github.com/rust-lang/rust/issues/112651

r? `@lcnr`
This commit is contained in:
bors 2023-10-03 10:02:52 +00:00
commit eb0f3ed59c
34 changed files with 282 additions and 65 deletions
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3
compiler/rustc_mir_build/src/build/expr/as_place.rs
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@ -102,7 +102,7 @@ fn convert_to_hir_projections_and_truncate_for_capture(
continue;
}
// These do not affect anything, they just make sure we know the right type.
ProjectionElem::OpaqueCast(_) => continue,
ProjectionElem::OpaqueCast(_) | ProjectionElem::Subtype(..) => continue,
ProjectionElem::Index(..)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Subslice { .. } => {
@ -709,6 +709,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
ProjectionElem::Field(..)
| ProjectionElem::Downcast(..)
| ProjectionElem::OpaqueCast(..)
| ProjectionElem::Subtype(..)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Subslice { .. } => (),
}