Squeak 4.5: Collections-ul.564.mcz

Chris Muller uploaded a new version of Collections to project Squeak 4.5:
http://source.squeak.org/squeak45/Collections-ul.564.mcz

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

Name: Collections-ul.564
Author: ul
Time: 3 February 2014, 2:35:36.802 pm
UUID: 4b9a37ef-df86-40a0-a0dd-8e8b2c04d4ed
Ancestors: Collections-ul.563

Make sure that Array >> #isLiteral won't get into an infinite recursion, even if the receiver has an recursive structure.

=============== Diff against Collections-ul.563 ===============

Item was changed:
  ----- Method: Array>>isLiteral (in category 'testing') -----
  isLiteral
+
+ ^self class == Array and: [
+ self isLiteralIfContainedBy: IdentitySet new ]!
- ^self class == Array and: [self allSatisfy: [:each | each isLiteral]]!

Item was added:
+ ----- Method: Array>>isLiteralIfContainedBy: (in category 'testing') -----
+ isLiteralIfContainedBy: parents
+ " Answer whether the receiver has a literal text form recognized by the compiler. Precondition: the receiver is an instance of Array. "
+
+ (parents includes: self) ifTrue: [ ^false ].
+ parents add: self.
+ 1 to: self size do: [ :index |
+ | element |
+ element := self at: index.
+ (element class == Array
+ ifTrue: [ element isLiteralIfContainedBy: parents ]
+ ifFalse: [ element isLiteral ]) ifFalse: [ ^false ] ].
+ parents remove: self.
+ ^true!