[Issue 24447] New: ImportC: extern symbols cannot have initializers

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24447

          Issue ID: 24447
           Summary: ImportC: extern symbols cannot have initializers
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: ImportC, rejects-valid
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dave287091 at gmail.com

The following C code is rejected:

```
extern int x = 3;
```

Error: variable `a.x` extern symbols cannot have initializers

As far as I can tell this is legal C, if unidiomatic.

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