From 314333e2ce7c06293ab6e5292b2927afb75b6a6f Mon Sep 17 00:00:00 2001
From: coq
Date: Wed, 22 Jan 2003 10:04:13 +0000
Subject: Bug 'with Module' corrige

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@3573 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 kernel/mod_typing.ml | 10 +++++++++-
 kernel/modops.ml     |  3 +++
 kernel/modops.mli    |  2 ++
 3 files changed, 14 insertions(+), 1 deletion(-)

(limited to 'kernel')

diff --git a/kernel/mod_typing.ml b/kernel/mod_typing.ml
index 7417b42619..8fee8481d7 100644
--- a/kernel/mod_typing.ml
+++ b/kernel/mod_typing.ml
@@ -108,7 +108,15 @@ and merge_with env mtb with_decl =
 	      | _ -> error_not_a_module (string_of_label l)
 	    in
 	    let mtb = type_modpath env' mp in
-	 (* here, we should assert that there is no msid in mtb *)
+	 (* here, using assertions in substitutions, 
+	    we check that there is no msid bound in mtb *)
+	    begin
+	      try 
+		let _ = subst_modtype (map_msid msid (MPself msid)) mtb in
+		  ()
+	      with
+		  Assert_failure _ -> error_circular_with_module id
+	    end;
 	    let cst = check_subtypes env' mtb old.msb_modtype in
 	    let equiv = 
  	      match old.msb_equiv with
diff --git a/kernel/modops.ml b/kernel/modops.ml
index ec25459a9f..c194a6c712 100644
--- a/kernel/modops.ml
+++ b/kernel/modops.ml
@@ -74,6 +74,9 @@ let error_local_context lo =
 	error ("The local context of the component "^
 	       (string_of_label l)^" is not empty")
 
+let error_circular_with_module l =
+  error ("The construction \"with Module "^(string_of_id l)^":=...\" is about to create\na circular module type. Their resolution is not implemented yet.\nIf you really need that feature, please report.")
+
 let rec scrape_modtype env = function
   | MTBident kn -> scrape_modtype env (lookup_modtype kn env)
   | mtb -> mtb
diff --git a/kernel/modops.mli b/kernel/modops.mli
index aaff572235..1391380b19 100644
--- a/kernel/modops.mli
+++ b/kernel/modops.mli
@@ -92,3 +92,5 @@ val error_not_a_constant : label -> 'a
 val error_with_incorrect : label -> 'a
 
 val error_local_context : label option -> 'a
+
+val error_circular_with_module : identifier -> 'a
-- 
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