bjoernager/rust
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rust/compiler/rustc_middle
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Matthias Krüger fa62fbe4b8
Rollup merge of #137257 - compiler-errors:fake-borrow-of-packed-field, r=oli-obk 
Ignore fake borrows for packed field check

We should not emit unaligned packed field reference errors for the fake borrows that we generate during match lowering.

These fake borrows are there to ensure in *borrow-checking* that we don't modify the value being matched (which is why this only occurs when there's a match guard, in this case `if true`), but they are removed after the MIR is processed by `CleanupPostBorrowck`, since they're really just there to cause borrowck errors if necessary.

I modified `PlaceContext::is_borrow` since that's used by the packed field check:
17c1c329a5/compiler/rustc_mir_transform/src/check_packed_ref.rs (L40)

It's only used in one other place, in the SROA optimization (by which fake borrows are removed, so it doesn't matter):
17c1c329a5/compiler/rustc_mir_dataflow/src/value_analysis.rs (L922)

Fixes https://github.com/rust-lang/rust/issues/137250
2025-02-22 01:01:41 +01:00
..
src Rollup merge of #137257 - compiler-errors:fake-borrow-of-packed-field, r=oli-obk 2025-02-22 01:01:41 +01:00
Cargo.toml Make fewer crates depend on rustc_ast_ir 2025-02-19 07:06:54 +00:00
messages.ftl clean up layout error diagnostics 2025-02-18 13:22:45 +01:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.