Adapt to ast::ItemImpl changes
Adapt to ast::ItemImpl changes

asantopietro/racer,drewet/racer,asantopietro/racer,racer-rust/racer,bluss/racer,rranelli/racer,Wilfred/racer,drewet/racer,bluss/racer,kbknapp/racer,ajroetker/racer,jaxx/racer,MattWis/racer,ifraixedes/racer,marvelm/racer,kbknapp/racer,hotpxl/racer,ajroetker/racer,alkama/racer,rranelli/racer,pmarcelll/racer,MattWis/racer,tafia/racer,andelf/racer,ane/racer,syohex/racer,syhkiller/racer,sliz1/racer,BonsaiDen/racer,BonsaiDen/racer,syhkiller/racer,sthapaun/racer,dleslie/racer,birkenfeld/racer,ane/racer,syohex/racer,ifraixedes/racer,phildawes/racer,sthapaun/racer