Issue #22423: Unhandled exception in thread no longer causes unhandled
AttributeError when sys.stderr is None.

--HG--
branch : 3.4
Issue #22423: Unhandled exception in thread no longer causes unhandled
AttributeError when sys.stderr is None.
Issue #21332: Ensure that ``bufsize=1`` in subprocess.Popen() selects line buffering, rather than block buffering.

--HG--
branch : 3.4
Issue #21332: Ensure that ``bufsize=1`` in subprocess.Popen() selects line buffering, rather than block buffering.
Merge heads

--HG--
branch : 3.4
Merge heads
Null merge
Issue #22423: Fixed debugging output of the GROUPREF_EXISTS opcode in the re
module.

--HG--
branch : 3.4
Issue #22423: Fixed debugging output of the GROUPREF_EXISTS opcode in the re
module.
Fixed issue #22415 number in Misc/NEWS for changeset e99a1df8db36.

--HG--
branch : 3.4
Fixed issue #22415 number in Misc/NEWS for changeset fe287268e97b.
Typo: headeronly -> headersonly

--HG--
branch : 3.4
MERGE: Typo: headeronly -> headersonly