tree ad453a48639481e9c35dc13206d68b1b48394871
parent 0751d554c0e9a8a2a0986d3003d00d11e516d1f8
author Tim Peters <tim.peters@gmail.com> 1089739090 +0000
committer Tim Peters <tim.peters@gmail.com> 1089739090 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4036472

Claifications:  visit procs are supplied by the core, users aren't
expected to write their own.  A NULL "object" must not be passed to
the visit callback.  A non-zero return from a visit proc isn't
necessarily an error return (and it doesn't matter to the tp_traverse
code *what* it might signify, their only job is to return it).