For rule associated with this parse tree internal node, return
the outer alternative number used to match the input. Default
implementation does not compute nor store this alt num. Create
a subclass of ParserRuleContext with backing field and set
option contextSuperClass.
to set it.
For rule associated with this parse tree internal node, return the outer alternative number used to match the input. Default implementation does not compute nor store this alt num. Create a subclass of ParserRuleContext with backing field and set option contextSuperClass. to set it.