bgra8 wrote:

@mizvekov we (at google) bisected a compilation error to this revision. The 
compilation breakage only reproduces with modules enabled.

The faulty compiler error is `error: enumeration 'foo::bar::XEnum' is 
incomplete` pointing to a forward declaration:
```
enum XEnum : int;
```

But the `XEnum` is correctly / fully declared later in the translation unit.

The error seems to be `enabled` by a `using enum ::foo::bar::XEnum;` statement 
inside a member function of a template class. If I remove the `using enum` 
statement and fully qualify all enumeration values inside that method the 
compilation succeeds.

The follow-up https://github.com/llvm/llvm-project/pull/156127 does not fix 
this specific issue.

Could this information help you pin-point the issue, or a reproducer is 
necessary?

https://github.com/llvm/llvm-project/pull/155313
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