If a module has a future statement enabling nested scopes, they are
also enable for the exec statement and the functions compile() and
execfile() if they occur in the module.
If Python is run with the -i option, which enters interactive mode
after executing a script, and the script it runs enables nested
scopes, they are also enabled in interactive mode.
XXX The use of -i with -c "from __future__ import nested_scopes" is
not supported. What's the point?
To support these changes, many function variants have been added to
pythonrun.c. All the variants names end with Flags and they take an
extra PyCompilerFlags * argument. It is possible that this complexity
will be eliminated in a future version of the interpreter in which
nested scopes are not optional.
with free variables. Thanks to Martin v. Loewis for finding two of
the problems. This fixes SF buf 405583.
There is also a C API change: PyFrame_New() is reverting to its
pre-2.1 signature. The change introduced by nested scopes was a
mistake. XXX Is this okay between beta releases?
cell_clear(), the GC helper, must decref its reference to break
cycles.
frame_dealloc() must dealloc all cell vars and free vars in addition
to locals.
eval_code2() setup code must INCREF cells it copies out of the
closure.
The STORE_DEREF opcode implementation must DECREF the object it passes
to PyCell_Set().
these can be missing on some (all?) Irix and Tru64 versions.
Protect the CRTSCTS value with a cast; this can be a larger value on
Solaris/SPARC.
This should fix SF tracker items #405092, #405350, and #405355.
defined and export both names.
Solaris also does not define CBAUDEX; it is not clear that CBAUDEXT
(which is defined there) is the same thing, so we only protect against
the lack of CBAUDEX.
Reported by Greg V. Wilson.
Fixed recno support (keys are integers rather than strings).
Work around DB bug that cause stdin to be closed by rnopen() when the
DB file needed to exist but did not (no longer segfaults).
This closes SF tracker patch #403445.
Also wrapped some long lines and added whitespace around operators -- FLD.
