Just make a ticket and put some symbol like → in it.

Trac[web_ui] ERROR: Failure sending notification on change to ticket #262: UnicodeEncodeError: 'ascii' codec can't encode character u'\u03bf' in position 11: ordinal not in range(128)
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Được gửi từ iPhone của tôi

Dear submitter,

as the package trac has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/948052

The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Scott Kitterman (the ftpmaster behind the curtain)