Use #deepCopy instead of #copy when copying RB parse tree
...because #copy make a copy if child nodes but does not set their parents properly.
Therefore node replacing does not work because it replaces it in wrong tree (original,
not the copy).
"{ Package: 'stx:goodies/petitparser/parsers/java' }"
"{ NameSpace: Smalltalk }"
PJExpressionNode subclass:#PJNullLiteralNode
instanceVariableNames:'literalValue'
classVariableNames:''
poolDictionaries:''
category:'PetitJava-AST'
!
!PJNullLiteralNode class methodsFor:'as yet unclassified'!
literalValue: aLiteral
^(self new) literalValue: aLiteral
! !
!PJNullLiteralNode methodsFor:'as yet unclassified'!
acceptVisitor: aVisitor
^ aVisitor visitNullLiteralNode: self
!
literalValue
^ literalValue
!
literalValue: anObject
literalValue := anObject
! !