Fix ICE when validating transmuting ZST to inhabited enum #145791
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Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt |
MIR validation attempts to determine the number of bytes needed to represent the size of the source type to compute the discriminant for the inhabited target enum. For a ZST source, there is no source data to use as a discriminant so no proper runtime check can be generated. Since that should never be possible, insert a delayed bug to ensure the problem has been properly reported to the user by the type checker.
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Rollup of 14 pull requests Successful merges: - #143898 (opt-dist: rebuild rustc when doing static LLVM builds) - #144452 (std/sys/fd: Relax `READ_LIMIT` on Darwin) - #145234 (match exhaustiveness diagnostics: show a trailing comma on singleton tuple consructors in witness patterns (and clean up a little)) - #145515 (Optimize `char::encode_utf8`) - #145540 (interpret/allocation: get_range on ProvenanceMap) - #145670 (port `sanitize` attribute to the new parsing infrastructure) - #145713 (next-solver: fix `feature(const_trait_impl)` bootstrap) - #145729 (Remove two duplicated crates) - #145744 (miri: also detect aliasing of in-place argument and return place) - #145774 (Remove default opts from config) - #145781 (Remove profile section from Clippy) - #145782 (rustdoc: make attributes render consistently) - #145787 (citool: cleanup `mismatched_lifetime_syntaxes` warnings) - #145791 (Fix ICE when validating transmuting ZST to inhabited enum) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of #145791 - samueltardieu:fix-zst-to-enum-mir-validation, r=compiler-errors Fix ICE when validating transmuting ZST to inhabited enum MIR validation attempts to determine the number of bytes needed to represent the size of the source type to compute the discriminant for the inhabited target enum. For a ZST source, there is no source data to use as a discriminant so no proper runtime check can be generated. Since that should never be possible, insert a delayed bug to ensure the problem has been properly reported to the user by the type checker. Fixes #145786
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Rollup of 14 pull requests Successful merges: - rust-lang/rust#143898 (opt-dist: rebuild rustc when doing static LLVM builds) - rust-lang/rust#144452 (std/sys/fd: Relax `READ_LIMIT` on Darwin) - rust-lang/rust#145234 (match exhaustiveness diagnostics: show a trailing comma on singleton tuple consructors in witness patterns (and clean up a little)) - rust-lang/rust#145515 (Optimize `char::encode_utf8`) - rust-lang/rust#145540 (interpret/allocation: get_range on ProvenanceMap) - rust-lang/rust#145670 (port `sanitize` attribute to the new parsing infrastructure) - rust-lang/rust#145713 (next-solver: fix `feature(const_trait_impl)` bootstrap) - rust-lang/rust#145729 (Remove two duplicated crates) - rust-lang/rust#145744 (miri: also detect aliasing of in-place argument and return place) - rust-lang/rust#145774 (Remove default opts from config) - rust-lang/rust#145781 (Remove profile section from Clippy) - rust-lang/rust#145782 (rustdoc: make attributes render consistently) - rust-lang/rust#145787 (citool: cleanup `mismatched_lifetime_syntaxes` warnings) - rust-lang/rust#145791 (Fix ICE when validating transmuting ZST to inhabited enum) r? `@ghost` `@rustbot` modify labels: rollup
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MIR validation attempts to determine the number of bytes needed to represent the size of the source type to compute the discriminant for the inhabited target enum. For a ZST source, there is no source data to use as a discriminant so no proper runtime check can be generated.
Since that should never be possible, insert a delayed bug to ensure the problem has been properly reported to the user by the type checker.
Fixes #145786