(module to-do mzscheme

  (define list-mutableof #t)
  (define list-mutable/c #t)
  (define cons-mutable/c #t)

  (define cons? #f)
  (define first #f)
  (define rest #f)
  (define empty? #f)
  (define empty #f)

  (define arity? #f)

  (provide (all-defined)))