Portabiluty: use `Exception new signal: message` to throw exceptions
...instead of #signalWith: It seems that this is the only portable way
to throw exceptions (at least among Pharo and Smalltalk/X)
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
Warning subclass:#PPCCompilationWarning
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Exceptions'
!