Specs:

flexi-streams 1.0.7
Quicklisp 2010121400
ECL 11.1.1
MacPorts 1.9.2
Mac OS X 10.6.6
MacBook Pro 5,1

Trace:

> (load "quicklisp")
> (ql:quickload "flexi-streams")

...

;;;   Invoking external command:
;;;   /usr/bin/gcc-4.2 -o /Users/andrew/.cache/common-lisp/ecl-11.1.1-macosx-x86/Users/andrew/quicklisp/dists/quicklisp/software/flexi-streams-1.0.7/mapping.fas -L/Users/andrew/macports/lib/ /private/var/folders/N-/N-IxaaKuFae5ik1WKxV6wE+++TI/-Tmp-/eclinit87rR0W.o /Users/andrew/.cache/common-lisp/ecl-11.1.1-macosx-x86/Users/andrew/quicklisp/dists/quicklisp/software/flexi-streams-1.0.7/mapping.o -bundle -L/Users/andrew/macports/lib -arch x86_64 -L/Users/andrew/macports/lib -arch x86_64 -lecl -lm 
In function COERCE, the value of variable is
        65533
which is not of expected type (INTEGER -128 127)

Available restarts:

1. (ABORT) ABORT
2. (TRY-RECOMPILING) Try recompiling ascii
3. (RETRY) Retry compiling component ("flexi-streams" "ascii").
4. (ACCEPT) Continue, treating compiling component ("flexi-streams" "ascii") as having been successful.
5. (ABORT) Give up on "hunchentoot"
6. (RESTART-TOPLEVEL) Go back to Top-Level REPL.

Broken at SI:BYTECODES. [Evaluation of: (QUICKLISP-CLIENT:QUICKLOAD "hunchentoot")]

Cheers,
Andrew Pennebaker