[issue3208] function annotation for builtin and C function

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The "First" argument does not apply here, we could just say "annotations
are not a function invariant", but the "Second" argument is valid to me. 

A solution would be a global (or interpreter-local if we really want to
support sub-interpreters) registry that stores annotations. The index
could not be the PyCFunctionObject (since it is different for every
bound method), but the address of the PyMethodDef entry.

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<http://bugs.python.org/issue3208>
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