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Tyler Wade  committed 16631b4

Document that slicing with negative indices isn't support when overriding __getslice__.

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File pypy/doc/coding-guide.rst

   ``__init__``, ``__del__``, ``__len__``, ``__getitem__``, ``__setitem__``,
   ``__getslice__``, ``__setslice__``, and ``__iter__``. To handle slicing,
   ``__getslice__`` and ``__setslice__`` must be used; using ``__getitem__`` and
-   ``__setitem__`` for slicing isn't supported.
+   ``__setitem__`` for slicing isn't supported. Additionally, using negative
+   indices for slicing is still not support, even when using ``__getslice__``.
 
 This layout makes the number of types to take care about quite limited.