[Issue 23189] importC: __builtin_offsetof without struct/union/enum should emit proper error message

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23189

--- Comment #5 from Walter Bright <bugzilla at digitalmars.com> ---
I'm not real sure what the problem is you're reporting. It's not clear what you
expect to compile?

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