[RFC] Are we going to support multiple pbacks in the near future?

[Paolo Carlini]

Hi,

I'm looking at _M_create_pback and _M_destroy_pback and
definitely they can be simplified considerably if we are
not going to support more than one putback in the near
future (indeed, according to at least one party, this is not
really important).

What do you all think?

To explain more concretely what I mean, I'm attaching a
**preliminary** patch which already passes make check and
some other sanity checks.

Paolo.

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