From: trevor_hansen <trevor_hansen@e59a4935-1847-0410-ae03-e826735625c1>
Date: Sat, 28 Jan 2012 13:57:37 +0000 (+0000)
Subject: Fix an assertion error.
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=15ccd3a0e32022cde86d7bfa5c2d51b655d14dcf;p=francis%2Fstp.git

Fix an assertion error.

git-svn-id: https://stp-fast-prover.svn.sourceforge.net/svnroot/stp-fast-prover/trunk/stp@1535 e59a4935-1847-0410-ae03-e826735625c1
---

diff --git a/src/simplifier/PropagateEqualities.cpp b/src/simplifier/PropagateEqualities.cpp
index d3225f0..90fd4b1 100644
--- a/src/simplifier/PropagateEqualities.cpp
+++ b/src/simplifier/PropagateEqualities.cpp
@@ -21,7 +21,11 @@ namespace BEEV
     Kind k = lhs.GetKind();
 
     if (k == SYMBOL)
-        return simp->UpdateSubstitutionMap(lhs, rhs); // checks whether it's been solved for or loops.
+        {
+          if (lhs == rhs)
+            return true;
+          return simp->UpdateSubstitutionMap(lhs, rhs); // checks whether it's been solved for or loops.
+        }
 
     if (k == NOT)
       return searchXOR(lhs[0], nf->CreateNode(NOT, rhs));
@@ -61,7 +65,12 @@ namespace BEEV
     const int width = lhs.GetValueWidth();
 
     if (lhs.GetKind() == SYMBOL)
-          return simp->UpdateSubstitutionMap(lhs, rhs); // checks whether it's been solved for, or if the RHS contains the LHS.
+      {
+        if (lhs == rhs)
+          return true;
+
+        return simp->UpdateSubstitutionMap(lhs, rhs); // checks whether it's been solved for, or if the RHS contains the LHS.
+      }
 
     if (lhs.GetKind() == BVUMINUS)
       return searchTerm(lhs[0], nf->CreateTerm(BVUMINUS, width, rhs));