compilation fix
compilation fix

compilation fix for rust version "rustc 0.13.0-nightly (7608dbad6 2014-12-31 10:06:21 -0800)"

markuskobler/hyper,mlalic/hyper,mneumann/hyper,achanda/hyper,fengsp/hyper,nickgonzales/hyper,frewsxcv/hyper,lame-nickname/hyper,steveklabnik/hyper,Twey/hyper,hannobraun/hyper,Keats/hyper,manuel-woelker/hyper,pyfisch/hyper,hyperium/hyper,servo/hyper,peterhj/hyper,bheesham/hyper,jmmaranan/hyper,hyperium/hyper,Keats/hyper,nickgonzales/hyper,hyperium/hyper,yangxingpping/hyper,hannobraun/hyper,retep998/hyper,nstoddard/hyper,clatour/hyper,Twey/hyper,giftcards/hyper,markuskobler/hyper,rschulman/hyper,mlalic/hyper,TimNN/hyper,youprofit/hyper,erickt/hyper,sfackler/hyper,golddranks/hyper,mfeckie/hyper,ianks/hyper,golddranks/hyper,tempbottle/hyper,PeterReid/hyper,Ryman/hyper,tshepang/hyper,huonw/hyper,softprops/hyper,mre/hyper,nstoddard/hyper,nickgonzales/hyper,mitsuhiko/hyper,tshepang/hyper,tshepang/hyper,bonifaido/hyper,hannobraun/hyper,yazaddaruvala/hyper,reem/hyper,markuskobler/hyper,fhahn/hyper,Twey/hyper,Keats/hyper,fuchsnj/hyper,mikedilger/hyper,yazaddaruvala/hyper,golddranks/hyper