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-rw-r--r--lib/Expr/Constraints.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Expr/Constraints.cpp b/lib/Expr/Constraints.cpp
index 5869a852..8f89f88a 100644
--- a/lib/Expr/Constraints.cpp
+++ b/lib/Expr/Constraints.cpp
@@ -122,7 +122,8 @@ void ConstraintManager::addConstraintInternal(ref<Expr> e) {
 
   switch (e->getKind()) {
   case Expr::Constant:
-    assert(e->getConstantValue() && "attempt to add invalid (false) constraint");
+    assert(cast<ConstantExpr>(e)->getConstantValue() && 
+           "attempt to add invalid (false) constraint");
     break;
     
     // split to enable finer grained independence and other optimizations