pattern at both ends of the string to match.

Patch by Matthew Barnett.
Closes #16203.

CID 486239: Uninitialized pointer read (UNINIT)

Issue #19218: set __name__ of _collections_abc to collections.abc in order to fix tests and keep beautiful qualified names.

This does not fix #19227, but should stop the Gentoo buildbot from hanging.

emulation has changed from 0-based indexing to 1-based like gnu readline.
Original patch by Ronald Oussoren.

("make smelly" now clean)