Christoph Thiede uploaded a new version of Collections to project The Inbox:
http://source.squeak.org/inbox/Collections-ct.872.mcz

==================== Summary ====================

Name: Collections-ct.872
Author: ct
Time: 20 January 2020, 12:26:15.859545 am
UUID: 9d48e360-1121-6541-ba00-1d06311f2f0c
Ancestors: Collections-nice.870

Implement #at:ifPresent: on SequenceableCollection

Text theQuickBrownFox at: 42 ifPresent: [:char |
	self inform: ({char.char} joinSeparatedBy: $.) asUppercase].

=============== Diff against Collections-nice.870 ===============

Item was added:
+ ----- Method: SequenceableCollection>>at:ifPresent: (in category 'accessing') -----
+ at: index ifPresent: aBlock
+ 
+ 	^ self at: index ifPresent: aBlock ifAbsent: []!