https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117533

            Bug ID: 117533
           Summary: internal compiler error: Segmentation fault signal
                    terminated program cc1plus with incomplete type
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yihan4845 at gmail dot com
  Target Milestone: ---

Compiler Explorer: https://godbolt.org/z/bzPojo1W4

The following program:
```cpp
class Empty {};
void use() {
  [](volatile class Empty ;) {};
}
```

will trigger segmentation fault for gcc trunk.

Stack dump:
```
g++: internal compiler error: Segmentation fault signal terminated program
cc1plus
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 4
```

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