Portability: Removed tests/asserts referring to BlockClosure
Due to historical reasons, there's no BlockClosure in Smalltalk/X,
the class is named Block. Conversely, there's no Block in Squeak/Pharo.
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
PPCNilNode subclass:#PPCSentinelNode
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Nodes'
!
PPCSentinelNode class instanceVariableNames:'Instance'
"
No other class instance variables are inherited by this class.
"
!
!PPCSentinelNode class methodsFor:'as yet unclassified'!
instance
^ Instance ifNil: [ Instance := self basicNew ]
! !