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This does not compile in ANTLR 4:
Number options { backtrack=true; }
: (IntegerLiteral Range)=> IntegerLiteral { $type = IntegerLiteral; }
| (FloatLiteral)=> FloatLiteral { $type = FloatLiteral; }
| IntegerLiteral { $type = IntegerLiteral; }
;
because of backtrace= true… What happened to it?
WHat should I use in ANTLR 4 instread of it?
At the moment, there are no rule-level options in ANTLR v4. Note that
backtrack=trueis no longer needed since the new parsing algorithm has no need for backtracking. Also note that in ANTLR v3,backtrack=truewas not valid inside lexer rules, only parser rules.