fact: Definition try (t : tactic) : tactic := fun '(Metavar _ _ g' as g)=> mtry t g with _ => M.ret [m:(m: tt, AnyMetavar _ _ g')] end.
imports: Strings.String ssrmatching.ssrmatching Mtac2(Logic Datatypes List Utils Logic intf.Sorts) Strings.String NArith.BinNat NArith.BinNatDef