public override Style VisitIllegalCharacterSyntax(PgnIllegalCharacterSyntax node, PgnEditor pgnEditor) => pgnEditor.Styles[illegalCharacterStyleIndex];
public virtual void VisitIllegalCharacterSyntax(PgnIllegalCharacterSyntax node) => DefaultVisit(node);
public override IGreenPgnSymbol VisitIllegalCharacterSyntax(PgnIllegalCharacterSyntax node) => node.Green;