visitSubterminalSymbol<E> method
Implementation
@override
void visitSubterminalSymbol<E>(SubterminalSymbol<E> node) {
_checkPlacement(node, false, [ProductionRuleKind.nonterminal], node);
_checkPlacement(node, true,
[ProductionRuleKind.subterminal, ProductionRuleKind.terminal], node);
_visitSymbol(node);
}