llvm-project/clang/test/SemaObjCXX/void_to_obj.mm

// RUN: clang-cc -fsyntax-only -verify %s

// <rdar://problem/6463729>
@class XX;

void func() {
  XX *obj;
  void *vv;

  obj = vv; // expected-error{{incompatible type assigning 'void *', expected 'XX *'}}
}