Object (EQL CONS) is not a valid specializer
   [Condition of type SIMPLE-ERROR]

Restarts:
 0: [TRY-RECOMPILING] Recompile pattern and try loading it again
 1: [RETRY] Retry loading FASL for #<cl-source-file "optima" "src" "pattern">.
 2: [ACCEPT] Continue, treating loading FASL for #<cl-source-file "optima" "src" "pattern"> as having been successful.
 3: [RETRY] Retry ASDF operation.
 4: [CLEAR-CONFIGURATION-AND-RETRY] Retry ASDF operation after resetting the configuration.
 5: [RETRY] Retry SLIME REPL evaluation request.
 --more--

Backtrace:
  0: G994
  1: #<bytecompiled-function BYTECODES>
  2: G104
  3: TRACK-PACKAGE
  4: G103
  5: G102
  6: REPL-EVAL
  7: LISTENER-EVAL
  8: #<bytecompiled-function BYTECODES>
  9: G376
 10: G373
 11: G407
 12: REPL-LOOP
 13: G73
 14: G72
 15: NIL