llvm/clang/test/Modules/Inputs/macros_top_b.h

#include "macros_top.h"
#undef TOP_REDEF_IN_SUBMODULES
#define TOP_REDEF_IN_SUBMODULES 1
#undef TOP_REDEF_IN_SUBMODULES
#define TOP_REDEF_IN_SUBMODULES 2