fact: Definition exact {A} (x:A) : tactic := fun g => match g with | Metavar _ _ g => M.inst_cumul_or_fail UniCoq x g;; M.ret [m:] end.
imports: Strings.String ssrmatching.ssrmatching Mtac2(Logic Datatypes List Utils Logic Sorts MTeleMatch) Strings.String NArith.BinNat NArith.BinNatDef