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From Doug Currie in ​http://clozure.com/pipermail/openmcl-devel/2009-July/010104.html:

Using the IDE "Check for Updates..." menu item seemed to hang -- is there no timeout? I traced it to CCL using the svn program in /usr/bin rather than the newer version I'd installed in /usr/local/bin.

The following transcript suggests the presence of a new bug in the CCL compiler in the vicinity of subtypep. Probably part of a disagreement about when (values ...) can be used in a type expression. Something like this just broke an ACL2 rebuild that didn't break yesterday.

% ccl -n
Welcome to Clozure Common Lisp Version 1.4-dev-r12509M-trunk  (LinuxX8664)!
? (defvar x)
X
? (defvar y)
Y
? (defun foo () x)
FOO
? (defun bar () y)
BAR
? (proclaim '(ftype (function () (values t)) foo bar))
NIL
? (defun fap () (- (foo) (bar)))
> Error: VALUES type illegal in this context:
>          (VALUES T)
> While executing: (:INTERNAL CCL::NX1-COMPILE-LAMBDA), in process listener(1).
> Type :GO to continue, :POP to abort, :R for a list of available restarts.
> If continued: continue compilation ignoring this form
> Type :? for other options.
1 >