Bug 16570 – [REG 2.072.0-b1] Enum member with interpreted initializer has type of initializer not enum

well, don't trust the title too much. Test case: °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°° static immutable int _a = 0; enum Regression /*:int*/ // OK with a type { a = _a, } void main() { Regression reg; with(Regression) final switch(reg) { case a:break; } } °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°° error: /tmp/temp_7FCE629C80B0.d(17,14): Error: cannot implicitly convert expression (0) of type int to Regression The problem seems more that the enum type is not deduced from the assignations. Anyway you'll tell me.

cat > bug.d << CODE static immutable int _a = 0; enum Regression { a = _a, } static assert(is(typeof(Regression.a) == Regression)); CODE dmd -c bug ---- bug.d(8): Error: static assert (is(int == Regression)) is false ---- Digger says that https://github.com/dlang/dmd/pull/5878 introduced the bug, seems reasonable (see https://github.com/dlang/dmd/pull/5878/files#diff-bbe16dab8171d70a98ca3272a1efcc4aR633).

Commits pushed to stable at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/620ecc2fa91dd88310a9205666fc0c826a778303 fix Issue 16570 - Enum member with interpreted... ...initializer has type of initializer not enum - There is a very old (dmd 0.50 [¹]) mismatch of the CastExp's `to` type and the type painted on the CastExp (the latter being the basetype of the former, i.e. EnumType vs. int) in the result of `Expression.castTo(ed.type)`. Because of that difference interpreting castTo might unexpectedly use the basetype instead of the enum type for the enum initializer, and thus triggers the can't convert int to EnumType error. - The trigger was introduced with the addition of a `e.ctfeInterpret` in denum.d (see 932be192e3). - Comments on CastExp suggest that this type mismatch is actually intended, I don't see any reason for it though. - Alternatively we could somehow fix ctfeInterpret to preserve CastExp's painted type. [¹]: https://github.com/dlang/dmd/blob/bde09435d149c699490bb888b832228e0d31c221/src/cast.c#L321-L323respect https://github.com/dlang/dmd/commit/fa464f3742f5b92324a20597489c475118a293cc Merge pull request #6175 from MartinNowak/fix16570 fix Issue 16570 - Enum member with interpreted...

Commits pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/620ecc2fa91dd88310a9205666fc0c826a778303 fix Issue 16570 - Enum member with interpreted... https://github.com/dlang/dmd/commit/fa464f3742f5b92324a20597489c475118a293cc Merge pull request #6175 from MartinNowak/fix16570

Commits pushed to newCTFE at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/620ecc2fa91dd88310a9205666fc0c826a778303 fix Issue 16570 - Enum member with interpreted... https://github.com/dlang/dmd/commit/fa464f3742f5b92324a20597489c475118a293cc Merge pull request #6175 from MartinNowak/fix16570

Commit pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/6f3b7e6b306818c65327cd698da1e401685ca025 Modify test for issue 16570 to accomodate fix for issue 12385

Commit pushed to stable at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/6f3b7e6b306818c65327cd698da1e401685ca025 Modify test for issue 16570 to accomodate fix for issue 12385