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