core: custom Debug impl for FileCache
core: custom Debug impl for FileCache

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