Add is_const

1 files changed, 7 insertions, 0 deletions

diff --git a/ltac/extratactics.ml4 b/ltac/extratactics.ml4
index 4903d50d1..97d33fb7a 100644
--- a/ltac/extratactics.ml4
+++ b/ltac/extratactics.ml4
@@ -887,6 +887,13 @@ TACTIC EXTEND is_proj
     | _ -> Tacticals.New.tclFAIL 0 (Pp.str "not a primitive projection") ]
 END;;
 
+TACTIC EXTEND is_const
+| [ "is_const" constr(x) ] ->
+  [ match kind_of_term x with
+    | Const _ -> Proofview.tclUNIT ()
+    | _ -> Tacticals.New.tclFAIL 0 (Pp.str "not a constant") ]
+END;;
+
 (* Command to grab the evars left unresolved at the end of a proof. *)
 (* spiwack: I put it in extratactics because it is somewhat tied with
    the semantics of the LCF-style tactics, hence with the classic tactic