fix compiler crash

diff --git a/Cython/Compiler/Optimize.py b/Cython/Compiler/Optimize.py
index b558657..7164863 100644 (file)
--- a/Cython/Compiler/Optimize.py
+++ b/Cython/Compiler/Optimize.py
@@ -3394,6 +3394,9 @@ class ConstantFolding(Visitor.VisitorTransform, SkipDeclarations):
 
     def visit_ExprStatNode(self, node):
         self.visitchildren(node)
+        if not isinstance(node.expr, ExprNodes.ExprNode):
+            # ParallelRangeTransform does this ...
+            return node
         # drop unused constant expressions
         if node.expr.has_constant_result():
             return None