The test case is broken. In order to output non-ascii characters with wcout,
the global locale must be set correctly before the first output operation.

The bug used to be real though, but should be fixed on mainline.

Test is invalid as explained in the previous comment.

Ie:


#include <iostream>
int 
main()
{
  using namespace std;
  const wchar_t w1 = { 0x4e2d };// U+20013 == 0x4E2D
  const wchar_t w2 = { 0x56fd };// U+22269 == 0x56FD
  const wchar_t w3(20013);
  const wchar_t w4(22269);

  locale loc("zh_CN.utf8");
  locale::global(loc);
  wcout << w1 << endl;
  wcout << w2 << endl;
  wcout << w3 << endl;
  wcout << w4 << endl;

  return 0;
}