From e7c9f5f130f5187e5d9b43c8f0ed15deb49e4b2c Mon Sep 17 00:00:00 2001
From: pboutill
Date: Tue, 18 May 2010 15:57:18 +0000
Subject: Applicative commutative cuts in Fixpoint guard condition

In "(match ... with |... -> fun x -> t end) u", "x" has now the subterm
property of "u" in the analysis of "t".

Commutative cuts aren't compatible with typing so we need to ensure that
term of "x"'s type and term of "u"'s have the same subterm_spec.
Consequently,declaration.MRec argument has changed to the inductive name
instead of only the number of the inductive in the mutual_inductive
family.

In subterm_specif and check_rec_call, arguments are stored in a stack.
At each lambda, one element is popped to add in renv a smarter
subterm_spec for the variable. subterm_spec of constructor's argument
was added this way, the job is now done more often.

Some eta contracted match branches are now accepted but enforcing
eta-expansion of branches might be anyway a recommended invariant.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13012 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 kernel/declarations.ml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/declarations.ml')

diff --git a/kernel/declarations.ml b/kernel/declarations.ml
index 4f98bb8b07..c7f8087428 100644
--- a/kernel/declarations.ml
+++ b/kernel/declarations.ml
@@ -71,7 +71,7 @@ let subst_rel_context sub = list_smartmap (subst_rel_declaration sub)
 
 type recarg =
   | Norec
-  | Mrec of int
+  | Mrec of inductive
   | Imbr of inductive
 
 let subst_recarg sub r = match r with
-- 
cgit v1.2.3