The ACCEPT restart of ASDF is terribly confusing to newbies. It's very tempting to just hit it and go on.
How about removing it? Are there really situations in which one can set the creation of a vital object file aside?
try loading closer-mop from fresh sources on sbcl, so that it also compiles before loading.
the asdf:load-op will stop with some warnings about already exported symbols (probably due to redefining a package). without the accept restart, i'd have to C-c and start over building my image.