[Issue 23721] New: runnable/test22513.c:18:28: error: field ‘t’ has incomplete type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23721

          Issue ID: 23721
           Summary: runnable/test22513.c:18:28: error: field ‘t’ has
                    incomplete type
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

When compiling the test with `gcc -std=c11 -fsyntax-only`

runnable/test22513.c:18:28: error: field ‘t’ has incomplete type
   18 | struct S { int a; struct T t; };
      |                            ^


Original test:
```
struct S { int a; struct T t; };
struct T { int b; int x; };
```

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