Testcase for #411, cpdef temps.

tests/run/cpdef_temps_T411.pyx

+__doc__ = """
+    >>> A().is_True()
+    True
+    >>> A().is_False()
+    False
+
+    >>> B().is_True()
+    True
+    >>> B().is_False()
+    False
+"""
+
+cdef class A:
+    cpdef is_True(self):
+        return True
+    cpdef is_False(self):
+        return not self.is_True()
+
+class B(A):
+    def is_True(self):
+        return True