Fix set's intersect.  We shouldn't mutate the map while iterating over it.
Fix set's intersect.  We shouldn't mutate the map while iterating over it.

sixolet/godropbox,zj8487/godropbox,horryq/godropbox,danielrh/godropbox,zj8487/godropbox,pattyshack/godropbox,wfxiang08/godropbox,zj8487/godropbox,icattlecoder/godropbox,wangtuanjie/godropbox,pattyshack/godropbox,cch123/godropbox,danielrh/godropbox,abduld/godropbox,danielrh/godropbox,dropbox/godropbox,dropbox/godropbox,wangtuanjie/godropbox,gc-locks/gosqlbuilder,wangtuanjie/godropbox,pattyshack/godropbox,horryq/godropbox,icattlecoder/godropbox,wfxiang08/godropbox,dropbox/godropbox,cch123/godropbox,icattlecoder/godropbox,cch123/godropbox,sixolet/godropbox,sixolet/godropbox,abduld/godropbox,horryq/godropbox,wfxiang08/godropbox,abduld/godropbox