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From: Chong Yidong <cyd@stupidchicken.com>
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Subject: Comparing font objects
Date: Sun, 15 Jun 2008 16:12:17 -0400
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To: Kenichi Handa  <handa@m17n.org>
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emacs -fn "Monospace-12"
M-: (set-face-attribute 'default nil :font "Monospace-12") RET

Debugger entered--Lisp error: (error "Stack overflow in equal")
  internal-set-lisp-face-attribute(default :font "Monospace-12" 0)
  set-face-attribute(default nil :font "Monospace-12")
  eval((set-face-attribute (quote default) nil :font "Monospace-12"))
  eval-expression((set-face-attribute (quote default) nil :font "Monospace-12") nil)
  call-interactively(eval-expression nil nil)

It appears that Fequal is looping while comparing font vectors.  Maybe
we need to handle font vector comparison specially (see fns.c:2205)?