Change $$ to $$+-
Change $$ to $$+-

res is now a ResumableSource rather than the actual result so $$+- must be used.
maxigit/yesodweb.com-content,maxigit/yesodweb.com-content,wolftune/yesodweb.com-content,mlitchard/lambdaweb.com-content,wolftune/yesodweb.com-content