UTF-8 vital error for chinese character which to be printed in console

[dlangBugzillaToGithub]

ll reported this on 2019-11-11T16:14:04Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=20384

Description

import std.stdio;
import core.stdc.stdio;
import core.stdc.stdlib;
 


void main()
{
    system("chcp 65001");// change code page to utf-8
    system("cls");       //clear the console
    writeln("你好啊世界");//OK
    //string str="123456";  // if str is ascii, the correct result will be get
    string str="你好啊世界"c;
                  //if str is chinese characters, the wrong result will be get
    char[] chs=str.dup;
   for(int i=0;i<chs.length;i++)
   {
        writeln(chs[i]);//both number and content of chinese are wrong
   }
	system("pause");//pause

}