antlr/tool/MIGRATION.txt

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Parsers
* Full context LL(*) not SLL(*)
* Adaptive, takes all but indirect left-recursion
Actions/scopes
* no global scopes. no scope[n].
Trees
* no ASTs
* no tree grammars
* parse trees created by default
* moved methods to Trees
Lexers
* Added [Abc] notation
* unicode rule/token names
* -> skip notation