https://issues.dlang.org/show_bug.cgi?id=24016

          Issue ID: 24016
           Summary: ImportC: __attribute__ in switch statements: error:
                    found `__attribute__` instead of statement
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: jlourenco5691@gmail.com

```c
void fun(int i)
{
  switch (i)
  {
    case 0: i++; __attribute__((fallthrough));
    default: return;
  }
}
```

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