20623
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11639 Backport Pharo2.0: Memory leak when using weak announcements with blocks
https://pharo.fogbugz.com/f/cases/11639(pass 2/2) Diff information: http://ss3.gemstone.com/ss/Pharo20/Collections-Weak-EstebanLorenzano.72.diff http://ss3.gemstone.com/ss/Pharo20/Announcements-Core-EstebanLorenzano.41.diff
