PyErr_SyntaxLocationEx() and PyErr_SyntaxLocationObject().

Patch by Julien Palard.

* In Python 3, the specifier is 0o
* There is no special case for leading zeros
* Remove duplicate tests
* Clarify other existing tests and comments

Thanks to Douglas Greiman for the patch.

Issue #28779: multiprocessing.set_forkserver_preload() would crash the forkserver process if a preloaded module instantiated some multiprocessing objects such as locks.

This makes tests passing after changes by issue #5322.

Original patch by Andreas Stührk.

writes the index file when it is not changed.

names.

Fixes #24142: [configparser] always join multiline values to not leave the parser in an invalid state

in the documentation.

Patch by Wojtek Ruszczewski.

Allow AF_UNIX in create_server & create_connection

Reloading the warnings module duplicates filters in warnings.filters. Fixing
the issue is tricky. It was decided to simply remove the check from Python 3.5,
since the bug only impacts Python unit tests, not real applications.

The check is kept in Python 3.6 and newer.

The fields ml_name and ml_doc are of type "const char *" rather of "char *".