Cython utility cdef classes are internal by default. Fixes #775.

Cython/Compiler/ModuleNode.py

@@ -82,6 +82,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
             # Ensure that we don't generate import code for these entries!
             for entry in scope.c_class_entries:
                 entry.type.module_name = self.full_module_name
+                entry.type.scope.directives["internal"] = True
 
             self.scope.merge_in(scope)
 

tests/run/memoryview_namespace_T775.pyx

+
+cdef int data[10]
+cdef int[:] myslice = data
+
+def test_memoryview_namespace():
+    """
+    >>> test_memoryview_namespace()
+    """
+    namespace = dir(__import__(__name__))
+    assert 'array' not in namespace, namespace
+    assert 'memoryview' not in namespace, namespace
+    assert '_memoryviewslice' not in namespace, namespace
+    assert 'Enum' not in namespace, namespace