From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Wed, 27 Sep 2006 13:14:33 +0000 (+0000)
Subject: New bug found in disambiguation of records.
X-Git-Tag: make_still_working~6848
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=6759156e7b8234dd4c024d58e63c293c051962f0;p=helm.git

New bug found in disambiguation of records.
To fix the bug it is necessary to propagate the substitution computed
during the type-checking of the constructors to the types of the inductive
types. This is quite complex to do. One possibility is simply to add the
substitution to the proof status.
---

diff --git a/helm/software/matita/tests/record.ma b/helm/software/matita/tests/record.ma
index ed9ecfed8..c024acf9e 100644
--- a/helm/software/matita/tests/record.ma
+++ b/helm/software/matita/tests/record.ma
@@ -37,3 +37,8 @@ record paperino: Prop \def {
   pippo : paolo \to paolo;
   piero : True
 }.
+
+(* the following test used to show the following bug: the left
+   parameter A in the type of t was not unified with the left
+   parameter A in the type of the constructor of the record *)
+record t A : Type := { f : t A }.