public override ParserRuleContext VisitAssignStmt([NotNull] StructuredTextParser.AssignStmtContext context)
            {
                var result = new VisualBasicParser.AssignStmtContext(_contextStack.Peek(), 0);

                _contextStack.Push(result);
                result.AddChild(Visit(context.variable()));
                result.AddChild(new CommonToken(VisualBasicParser.ASSIGN, "="));
                result.AddChild(Visit(context.expression()));
                _contextStack.Pop();
                return(result);
            }
 /// <summary>
 /// Visit a parse tree produced by <see cref="StructuredTextParser.assignStmt"/>.
 /// <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 virtual Result VisitAssignStmt([NotNull] StructuredTextParser.AssignStmtContext context)
 {
     return(VisitChildren(context));
 }