CL-USER> (asdf:operate 'asdf/bundle:monolithic-fasl-op :gendl)
; Warning: MONOLITHIC-FASL-OP on #<SYSTEM "gendl"> completed without its output file #P"/Users/dcooper8/.cache/common-lisp/ccl-1.9-f96-macosx-x64/Users/dcooper8/genworks/gdl/gendl/gendl--all-systems.dx64fsl"
; While executing: #<STANDARD-METHOD ASDF/ACTION:COMPUTE-ACTION-STAMP (T ASDF/OPERATION:OPERATION ASDF/COMPONENT:COMPONENT)>, in process repl-thread(11).
#<MONOLITHIC-FASL-OP >
((#<MONOLITHIC-FASL-OP > . #<SYSTEM "gendl">))
CL-USER> (probe-file (first (asdf:output-files 'asdf/bundle:monolithic-fasl-op :gendl)))
NIL
CL-USER>