anchor.diff:                                              source
                                               standard
                                               options
  -                                            arguments
                                               shared
                       &allow-other-keys)
     (:method ((compiler T) from to &rest args &key)
  
positive.code:   (:method ((compiler T) from to &rest args &key)
      (apply #'c-compile *default-compiler* from to args))
    (:method (c-compiler from to &rest args &key options
                                                 arguments
                                                 (preprocess T)
                                                 (assemble T)
                                                 (link T))
  
negative.code:              ("-x~a" source)
               ("-std=~a" standard)
               ("-Wp~{,~a~}" options)
               ("-o ~a" to)
               ("~a" from)))))
  
  