anchor.diff:    (cps-exceptions nil)
     (cps-functions nil)
   
  -  ; You shouldn't have to tweak these at construction-time:
  +  ; You shouldn't have to tweak these.
     (symbol-translations nil)
     thisify-classes
     (function-args (make-hash-table :test #'eq))
  
positive.code:   (defined-functions nil)
    (defined-functions-hash (make-hash-table :test #'eq))
  
    ; functinos required by transpiled code. It is imported from the
    ; environment.
    (wanted-functions nil)
    (wanted-functions-hash (make-hash-table :test #'eq))
  
    (wanted-variables nil)
    (wanted-variables-hash (make-hash-table :test #'eq))
  
    (defined-variables nil)
    (defined-variables-hash (make-hash-table :test #'eq))
  
    ; Tells if target required named top-level functions (like C).
    (named-functions? nil)
  
negative.code:   ; List of functions that must not be imported from the environment.
    unwanted-functions
  
    (identifier-char? (fn error "structure 'transpiler': IDENTIFIER-CHAR? is not initialised"))
    (literal-conversion (fn error "structure 'transpiler': LITERAL-CONVERSION is not initialised"))
  
    (expex nil)
  
  