Guido van Rossum added the comment:
Actually, I just found an embarrassingly simple fix:
diff --git a/src/typing.py b/src/typing.py
index d900036..49c4a06 100644
--- a/src/typing.py
+++ b/src/typing.py
@@ -981,7 +981,7 @@ class GenericMeta(TypingMeta, abc.ABCMeta):
"Cannot substitute %s for %s in %s" %
(_type_repr(new), _type_repr(old), self))
- return self.__class__(self.__name__, self.__bases__,
+ return self.__class__(self.__name__, (self,) + self.__bases__,
dict(self.__dict__),
parameters=params,
origin=self,
I'll go check this in now, together with a test.
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25472>
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