From 3eb1e805be574064225e832bffb01f2410c41518 Mon Sep 17 00:00:00 2001
From: Jason Gross
Date: Tue, 7 Jun 2016 22:55:50 -0400
Subject: Add is_ind, is_constructor, is_proj

---
 ltac/extratactics.ml4 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/ltac/extratactics.ml4 b/ltac/extratactics.ml4
index 5d3c149ab9..4903d50d17 100644
--- a/ltac/extratactics.ml4
+++ b/ltac/extratactics.ml4
@@ -866,6 +866,27 @@ TACTIC EXTEND is_cofix
     | _ -> Tacticals.New.tclFAIL 0 (Pp.str "not a cofix definition") ]
 END;;
 
+TACTIC EXTEND is_ind
+| [ "is_ind" constr(x) ] ->
+  [ match kind_of_term x with
+    | Ind _ -> Proofview.tclUNIT ()
+    | _ -> Tacticals.New.tclFAIL 0 (Pp.str "not an (co)inductive datatype") ]
+END;;
+
+TACTIC EXTEND is_constructor
+| [ "is_constructor" constr(x) ] ->
+  [ match kind_of_term x with
+    | Construct _ -> Proofview.tclUNIT ()
+    | _ -> Tacticals.New.tclFAIL 0 (Pp.str "not a constructor") ]
+END;;
+
+TACTIC EXTEND is_proj
+| [ "is_proj" constr(x) ] ->
+  [ match kind_of_term x with
+    | Proj _ -> Proofview.tclUNIT ()
+    | _ -> Tacticals.New.tclFAIL 0 (Pp.str "not a primitive projection") ]
+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
-- 
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