A new version of Compiler was added to project The Inbox:
http://source.squeak.org/inbox/Compiler-ct.406.mcz

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

Name: Compiler-ct.406
Author: ct
Time: 29 June 2019, 11:38:56.93143 pm
UUID: d6e9e7fc-f54b-044d-bc18-790786074075
Ancestors: Compiler-ct.405

Fix SyntaxErrorNotification>>#messageText implementation (Error>>#messageText is never nil)

=============== Diff against Compiler-ct.405 ===============

Item was changed:
  ----- Method: SyntaxErrorNotification>>messageText (in category 'accessing') -----
  messageText
  	^ super messageText
+ 		ifEmpty: [messageText := code]!
- 		ifNil: [messageText := code]!