PyInt_Check() succeeds.  That returns true for subtypes of int, which
may override __add__ or __sub__.

long_subtype_new(): fix a typo (type->ob_size instead of
tmp->ob_size).

default_getpass().  This should prevent hanging when it is called in
IDLE.

Fixes SF bug #455648.

restricted execution mode.

Algorithm.  This closes SF bug #454917.

"should have" been added here when they were added to lists).

when that test is doomed to deadlock.

If tp_itemsize of the basetype is nonzero, only allow empty __slots__
(declaring that no __dict__ should be added), and don't add a weakref
offset.

visit_finalizer_reachable since it's the same as visit_reachable.
Rename visit_reachable to visit_move.  Objects can now have the GC type
flag set, reachable by tp_traverse and not be in a GC linked list.  This
should make the collector more robust and easier to use by extension
module writers.  Add memory management functions for container objects
(new, del, resize).

the setup script is running from inside Vim.

the old flag to still compile.  Remove the PyType_BASICSIZE and
PyType_SET_BASICSIZE macros.  Add PyObject_GC_New, PyObject_GC_NewVar,
PyObject_GC_Resize, PyObject_GC_Del, PyObject_GC_Track,
PyObject_GC_UnTrack.  Part of SF patch #421893.

the old flag to still compile.

try/except or try/finally.

Previous versions had only track SETUP_LOOP blocks and ignored the
exception part.  This meant that it allowed continue inside a
try/except but generated buggy code.  Now it does the right thing.

Add CONTINUE_LOOP to the list of unconditional transfers