fix hashing of CPtrType in Py3k

Cython/Compiler/PyrexTypes.py

@@ -2161,9 +2161,6 @@ class CPointerBaseType(CType):
                     self.from_py_function = "__Pyx_PyBytes_AsUString"
             self.exception_value = "NULL"
 
-    def __hash__(self):
-        return hash(self.base_type) + self.is_ptr + 27 # arbitrarily chosen offset
-
     def py_type_name(self):
         if self.is_string:
             return "bytes"
@@ -2187,11 +2184,13 @@ class CArrayType(CPointerBaseType):
         self.size = size
 
     def __eq__(self, other):
-        if isinstance(other, CType):
-            if self.is_array and other.is_array and self.size == other.size:
-                return self.base_type.same_as(other.base_type)
+        if isinstance(other, CType) and other.is_array and self.size == other.size:
+            return self.base_type.same_as(other.base_type)
         return False
 
+    def __hash__(self):
+        return hash(self.base_type) + 28 # arbitrarily chosen offset
+
     def __repr__(self):
         return "<CArrayType %s %s>" % (self.size, repr(self.base_type))
 
@@ -2232,6 +2231,9 @@ class CPtrType(CPointerBaseType):
     is_ptr = 1
     default_value = "0"
 
+    def __hash__(self):
+        return hash(self.base_type) + 27 # arbitrarily chosen offset
+
     def __eq__(self, other):
         if isinstance(other, CType) and other.is_ptr:
             return self.base_type.same_as(other.base_type)