Reject context-dependent enum discriminants - #3631
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## Gzghu5ypldjnatumvxfh6zygvwuqht3av #3631 +/- ##
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Derives that validate enum tags copy explicit discriminants into a helper enum. Context-dependent expressions can evaluate differently in that helper, allowing the generated validator to accept an invalid original-enum tag. Restrict copied discriminants to a compiler-defined, repeatable grammar of integer and byte literals with primitive arithmetic and bitwise operations. Reject paths, macros, calls, casts, attributes, and other context-bearing forms before emitting any unsafe impl. Preserve the skip-on-error dependency chain for exhaustive enums, including fieldful variants whose zero tag cannot be identified syntactically, and add cross-toolchain regressions. Closes #3619 *Authored by an AI agent acting on Josh Liebow-Feeser's behalf.* gherrit-pr-id: Gifjr6pbpu4fh6t7qbzuuqczj3odny3ck
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Derives that validate enum tags copy explicit discriminants into a helper
enum. Context-dependent expressions can evaluate differently in that helper,
allowing the generated validator to accept an invalid original-enum tag.
Restrict copied discriminants to a compiler-defined, repeatable grammar of
integer and byte literals with primitive arithmetic and bitwise operations.
Reject paths, macros, calls, casts, attributes, and other context-bearing
forms before emitting any unsafe impl. Preserve the skip-on-error dependency
chain for exhaustive enums, including fieldful variants whose zero tag cannot
be identified syntactically, and add cross-toolchain regressions.
Closes #3619
Authored by an AI agent acting on Josh Liebow-Feeser's behalf.
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git fetch origin refs/heads/Gifjr6pbpu4fh6t7qbzuuqczj3odny3ck && git checkout -b pr-Gifjr6pbpu4fh6t7qbzuuqczj3odny3ck FETCH_HEADCheckout
git fetch origin refs/heads/Gifjr6pbpu4fh6t7qbzuuqczj3odny3ck && git checkout FETCH_HEADCherry Pick
git fetch origin refs/heads/Gifjr6pbpu4fh6t7qbzuuqczj3odny3ck && git cherry-pick FETCH_HEADPull
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