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9fce3dc685
Fix insufficient logic when searching for the underlying allocation This PR fixes the logic inside the `invalid_reference_casting` lint, when trying to lint on bigger memory layout casts. More specifically when looking for the "underlying allocation" we were wrongly assuming that when we got `&mut slice[index]` that `slice[index]` was the allocation, but it's not. Fixes https://github.com/rust-lang/rust/issues/124685