Tests/RunCMake/CXXModules/sources/module-header.h - third_party/cmake - Git at Google

 #ifndef module_header_h
 #define module_header_h

 inline int h()
 {
   return 0;
 }

 #endif
	#ifndef module_header_h
	#define module_header_h

	inline int h()
	{
	return 0;
	}

	#endif