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-rw-r--r--lib/Solver/CexCachingSolver.cpp5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Solver/CexCachingSolver.cpp b/lib/Solver/CexCachingSolver.cpp
index 546d81fd..49db74e8 100644
--- a/lib/Solver/CexCachingSolver.cpp
+++ b/lib/Solver/CexCachingSolver.cpp
@@ -217,7 +217,8 @@ bool CexCachingSolver::computeValidity(const Query& query,
     return false;
   assert(a && "computeValidity() must have assignment");
   ref<Expr> q = a->evaluate(query.expr);
-  assert(q->isConstant() && "assignment evaluation did not result in constant");
+  assert(isa<ConstantExpr>(q) && 
+         "assignment evaluation did not result in constant");
 
   if (q->getConstantValue()) {
     if (!getAssignment(query, a))
@@ -268,7 +269,7 @@ bool CexCachingSolver::computeValue(const Query& query,
     return false;
   assert(a && "computeValue() must have assignment");
   result = a->evaluate(query.expr);  
-  assert(result->isConstant() && 
+  assert(isa<ConstantExpr>(result) && 
          "assignment evaluation did not result in constant");
   return true;
 }