https://issues.dlang.org/show_bug.cgi?id=24306

          Issue ID: 24306
           Summary: ImportC: same name structs in separate C files
                    interfere when compiled together
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: ImportC
          Severity: normal
          Priority: P3
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: dkorpel@live.nl

a.c
```
struct S;
```

b.c
```
struct S {}
```

dmd a.c // works
dmd b.c // works
dmd a.c b.c // fails with:

Error: struct `a.S` unknown size

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