Print filename in "there are pending proofs" error
Print filename in "there are pending proofs" error

Fix #9404

SkySkimmer/coq,ejgallego/coq,coq/coq,coq/coq,SkySkimmer/coq,ejgallego/coq,SkySkimmer/coq,Zimmi48/coq,Zimmi48/coq,SkySkimmer/coq,ejgallego/coq,Zimmi48/coq,ejgallego/coq,coq/coq,Zimmi48/coq,coq/coq