DMFF: almost there... now with a saner error message
DMFF: almost there... now with a saner error message

hoheinzollern/FStar,YaccConstructor/FStar,hoheinzollern/FStar,FStarLang/FStar,hoheinzollern/FStar,YaccConstructor/FStar,FStarLang/FStar,A-Manning/FStar,A-Manning/FStar,FStarLang/FStar,YaccConstructor/FStar,YaccConstructor/FStar,hoheinzollern/FStar,A-Manning/FStar