view CONTRIBUTING @ 39762:edaa40dc5fe5

py3: create built in exceptions with str type messages in win32.py

I hit an IOError in unlink() in test-pathconflicts-basic.t, that then crashed as
it was handled:

    File "mercurial\dispatch.py", line 359, in _runcatch
      return _callcatch(ui, _runcatchfunc)
    File "mercurial\dispatch.py", line 367, in _callcatch
      return scmutil.callcatch(ui, func)
    File "mercurial\scmutil.py", line 252, in callcatch
      ui.error(_("abort: %s\n") % encoding.strtolocal(inst.strerror))
    File "mercurial\encoding.py", line 205, in unitolocal
      return tolocal(u.encode('utf-8'))
  AttributeError: 'bytes' object has no attribute 'encode'

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