/// <summary>
/// Visit a parse tree produced by <see cref="Z80TestParser.valueDef"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public override object VisitValueDef(Z80TestParser.ValueDefContext context)
{
return(IsInvalidContext(context)
? null
: new ValueMemberNode(context, (ExpressionNode)VisitExpr(context.expr())));
}