(compile nil (lambda (arg)
(handler-bind ((error (constantly nil))) (car arg))))
*** - Compiler bug!! Occurred in ASSEMBLE-LAP at (HANDLER-BEGIN).
this bug was present before the 2005-01-21 patch which made %HANDLER-BIND have a function syntax.
it is now (after the 2011-03-29 patch which fixed bug#3147908) present again.
note that asdf.lisp cannot be compiled ootb until this bug is fixed.