bug? /Font resourceforall generates undefinedresource error

When attempting to enumerate available fonts using the method
recommended in the PostScript Language Reference Manual, I am
getting an undefinedresource error.

I think this is different than the situation in known issues where
font names reported by resourceforall may provoke errors when passed
to findfont, because all I am doing (trying to do) is print the
names to stdout using ==.  Should I be doing something differently,
or is this a bug?

$ echo '(*)' '{ == }' 128 string /Font resourceforall | gs -sDEVICE=pcl3 -sSubdevice=unspecold '-sOutputFile=dummy' -dNOPAUSE -dBATCH -dSAFER - > Fonts-pcl3-unspecold
GPL Ghostscript 8.71: Unrecoverable error, exit code 1

The stdout file contains:
GPL Ghostscript 8.71 (2010-02-10)
Copyright (C) 2010 Artifex Software, Inc.  All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Error: /undefinedresource in /HYGoThic-Medium
Operand stack:
   (*)   --nostringval--   (HYGoThic-Medium-UniJIS2004-UTF16-HB5HCHHCH\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000)   --dict:242/320(L)--   --dict:451/480(L)--   HYGoThic-Medium-UniJIS2004-UTF16-H   HYGoThic-Medium   UniJIS2004-UTF16-H   HYGoThic-Medium
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1878   1   3   %oparray_pop   1877   1   3   %oparray_pop   1861   1   3   %oparray_pop   1755   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   1831   4   3   %oparray_pop   --nostringval--   --nostringval--   --dict:41/80(L)--   --nostringval--   113   %dict_continue   --nostringval--   --dict:242/320(L)--   --nostringval--   510   %dict_continue   --nostringval--   --nostringval--   --nostringval--   --nostringval--   --nostringval--   --nostringval--
Dictionary stack:
   --dict:1152/1684(ro)(G)--   --dict:0/20(G)--   --dict:76/200(L)--   --dict:17/17(ro)(G)--   --dict:20/26(ro)(G)--
Current allocation mode is local
Last OS error: 2