eliminates shadow warnings from dropwhile
eliminates shadow warnings from dropwhile

tempbottle/cppitertools,jkhoogland/cppitertools,jkhoogland/cppitertools,jkhoogland/cppitertools,tempbottle/cppitertools,ryanhaining/cppitertools,tempbottle/cppitertools,ryanhaining/cppitertools,ryanhaining/cppitertools