Tests/RunCMake/while/InvalidArgument.cmake - third_party/github.com/Kitware/CMake - Git at Google

 cmake_policy(SET CMP0130 NEW)
 while((A B) OR ("$ENV{NOT_AN_ENV_VARIABLE}"))
   message(STATUS "Invalid evaluated to TRUE")
   return()
 endwhile()
 message(STATUS "Invalid evaluated to FALSE")
	cmake_policy(SET CMP0130 NEW)
	while((A B) OR ("$ENV{NOT_AN_ENV_VARIABLE}"))
	message(STATUS "Invalid evaluated to TRUE")
	return()
	endwhile()
	message(STATUS "Invalid evaluated to FALSE")