[issue16612] Integrate "Argument Clinic" specialized preprocessor into CPython trunk

[Stefan Krah]

Stefan Krah added the comment:

I've started working on the alternative DSL PEP, but I hit a DSL-independent roadblock:

The preprocessor passes copies of structs to the _impl functions,
which could lead to subtle bugs. I pointed out a benign example on
Rietveld, but in general I think this should not be done.

So the question is whether to add another flag or symbol that
determines if a pointer should be passed to the _impl function.

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<http://bugs.python.org/issue16612>
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