On 14 jun. 2011, at 19:48, Zach Beane <xach at xach.com> wrote: > > I recently ran into some accidentally unportable code that specialized a > method argument on DOUBLE-FLOAT. It worked in SBCL but failed in CLISP because CLISP provides no DOUBLE-FLOAT class. Yes, I had the same thing once with specializing on SIMPLE-VECTOR in SBCL while it had to be a VECTOR in CLISP.