nameres: fix misrecognition of "impl X for Y"
nameres: fix misrecognition of "impl X for Y"

for and while loops only can occur at stmt start anyway.

kbknapp/racer,syhkiller/racer,sthapaun/racer,hotpxl/racer,alkama/racer,BonsaiDen/racer,jaxx/racer,MattWis/racer,sthapaun/racer,phildawes/racer,drewet/racer,birkenfeld/racer,kbknapp/racer,racer-rust/racer,drewet/racer,sliz1/racer,dleslie/racer,pmarcelll/racer,MattWis/racer,syhkiller/racer,Wilfred/racer,BonsaiDen/racer