From bcca8dbc865747a62541c602f28ac8d99f84504d Mon Sep 17 00:00:00 2001
From: Yves Bertot
Date: Mon, 7 May 2018 21:03:41 +0200
Subject: adds a copy of the show_proof command

---
 tuto1/src/g_tuto1.ml4 | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tuto1/src/g_tuto1.ml4 b/tuto1/src/g_tuto1.ml4
index e71c880d01..da14d03842 100644
--- a/tuto1/src/g_tuto1.ml4
+++ b/tuto1/src/g_tuto1.ml4
@@ -1,5 +1,11 @@
 DECLARE PLUGIN "tuto1_plugin"
 
+(* If we forget this line and include our own tactic definition using
+  TACTIC EXTEND, as below, then we get the strage error message
+  no implementation available for Tacentries, only when compiling
+  theories/Loader.v
+*)
+open Ltac_plugin
 open Pp
 (* This one is necessary, to avoid message about missing wit_string *)
 open Stdarg
@@ -122,3 +128,21 @@ VERNAC COMMAND EXTEND ExamplePrint CLASSIFIED AS QUERY
       (EConstr.of_constr
         (Simple_print.simple_body_access (Nametab.global r)))) ]
 END
+
+TACTIC EXTEND my_intro
+| [ "my_intro" ident(i) ] ->
+  [ Tactics.introduction ~check:false i]
+END
+
+(* if one write this:
+  VERNAC COMMAND EXTEND exploreproof CLASSIFIED AS QUERY
+  it gives an error message that is basically impossible to understand. *)
+
+VERNAC COMMAND EXTEND ExploreProof CLASSIFIED AS QUERY
+| [ "Cmd9" ] ->
+  [ let p = Proof_global.give_me_the_proof () in
+    let sigma, env = Pfedit.get_current_context () in
+    let pprf = Proof.partial_proof p in
+    Feedback.msg_notice
+      (Pp.prlist_with_sep Pp.fnl (Printer.pr_econstr_env env sigma) pprf) ]
+END
-- 
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