anchor.diff:    (+! (delayed-exprs) (frontend (list x)))
     nil)
   
  -(fn add-late-symbol (x)
  -  (= (href (late-symbols) x) t)
  -  x)
  -
   (fn add-toplevel-expression (x)
     (push x (accumulated-toplevel-expressions)))
   
  
positive.code:      (transpiler-host-functions tr)         (make-host-functions)
       (transpiler-host-variables tr)         (make-host-variables)
       (transpiler-functionals tr)            (make-functionals)
       (transpiler-late-symbols tr)           (make-hash-table :test #'eq)
       (transpiler-identifiers tr)            (make-hash-table :test #'eq)
       (transpiler-converted-identifiers tr)  (make-hash-table :test #'eq)
       (transpiler-real-function-names tr)    (make-hash-table :test #'eq)
  
negative.code:   ;;; For users.
    ;;;
  
    ; Also generate argument expanders for functions with simple argument
    ; lists to validate all calls at run-time.
    (always-expand-arguments?   nil)
  