Marcel Taeumel uploaded a new version of Tools to project The Trunk:
http://source.squeak.org/trunk/Tools-mt.816.mcz

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

Name: Tools-mt.816
Author: mt
Time: 27 May 2018, 1:29:43.342902 pm
UUID: 2cf67d46-e4f6-724f-af58-3c5bf46ef91e
Ancestors: Tools-mt.815

For clarity, only use one environment per system code browser. There is code in Browser etc. that relies on that fact.

=============== Diff against Tools-mt.815 ===============

Item was changed:
  ----- Method: Browser>>environment (in category 'accessing') -----
  environment
+ 	^ environment 	ifNil: [Environment default]!
- 	^ environment 	ifNil: [super environment]!