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AXAnnouncements
Last updated at 2:05 pm UTC on 7 June 2019
http://www.squeaksource.com/AXAnnouncements.html
See Announcements Framework

http://forum.world.st/Observer-pattern-implementations-tp5099984p5100081.html
Levente Uzonyi:

File
Announcements-ul.2.
loads fine in Squeak 5.2

All tests are green.

The package with the AX prefix in the same repository wasn't fixed.

The code was not ported from VW but written from scratch based on Vassili's blog posts about Announcements, so there should be no copyright issues.