Fixed gcc warning with list comprehensions

Ticket 65

Cython/Compiler/ExprNodes.py

@@ -2619,7 +2619,7 @@ class ListComprehensionAppendNode(ExprNode):
         self.is_temp = 1
     
     def generate_result_code(self, code):
-        code.putln("%s = PyList_Append(%s, %s); %s" %
+        code.putln("%s = PyList_Append(%s, (PyObject*)%s); %s" %
             (self.result_code,
             self.target.result_code,
             self.expr.result_code,

tests/run/listcomp.pyx

+u"""
+>>> smoketest()
+[0, 4, 8]
+>>> typed()
+[A, A, A]
+"""
+
+def smoketest():
+    print [x*2 for x in range(5) if x % 2 == 0]
+
+cdef class A:
+    def __repr__(self): return "A"
+
+def typed():
+    cdef A obj
+    print [obj for obj in [A(), A(), A()]]
\ No newline at end of file