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Go runtime panic

@chenquan reported bug here: #3834 (comment)

I found this problem in github.com/antlr/antlr4/runtime/Go/antlr v1.4.10. grammar:https://github.com/antlr/grammars-v4/tree/master/sql/mysql/Positive-Technologies

panic: interface conversion: antlr.PredictionContext is *antlr.EmptyPredictionContext, not *antlr.ArrayPredictionContext [recovered]
	panic: interface conversion: antlr.PredictionContext is *antlr.EmptyPredictionContext, not *antlr.ArrayPredictionContext [recovered]
	panic: interface conversion: antlr.PredictionContext is *antlr.EmptyPredictionContext, not *antlr.ArrayPredictionContext