wrong-type-argument charsetp unbound error in emacs-unicode-2 current

[Bob Halley]

Up until a few days ago, I had no problem with running the head of the 
emacs-unicode-2 branch, but it is now failing.

If I start emacs and then kill some text, e.g. something simple like 
"foo^A^K" in *scratch*, then I get a  (wrong-type-argument charsetp 
unbound) error.  Emacs usually doesn't survive long after reporting that 
error either, typically dying with SIGSEGV after a few additional 
editing operations.

I set debug-on-error and the backtrace is:

Debugger entered--Lisp error: (wrong-type-argument charsetp unbound)
 ccl-execute-on-string([0 61 257 829 16 128 -1020 1 827 16 194 22 78 
82681 192 1019 21 128 22 1083 16 224 257 -5372 78 82681 192 1019 21 128 
22 1083 16 240 257 -8444 78 82681 192 1019 21 128 22 1083 16 248 257 
-11516 78 82681 ...] [0 0 0 0 0 0 0 0 0] "foo")
 string-utf-8-p("foo")
 xselect-convert-to-string(PRIMARY UTF8_STRING #("foo" 0 1 (fontified t 
auto-composed t) 1 2 (fontified t auto-composed t) 2 3 (fontified t 
auto-composed t)))

I didn't get any core from the SIGSEGV.

I can easily reproduce the problem, so let me know if you need any more 
info.

/Bob