;;;; The count is `length`, and `len` is left to programs — it is the obvious
;;;; name for a local holding one, and a builtin sitting on it would take that
;;;; away. So a call to a `len` this program has not defined is a call to a
;;;; name nothing defines, and the refusal has to say the word that does work
;;;; and write the call out with it. `len-bound.flan` is the other half: the
;;;; name binds like any other.
;;;;
;;;; The sentence is said rather than guessed at. `len` and `length` are three
;;;; edits apart and the did-you-mean's net is one, so nothing else in the
;;;; compiler would reach it.

(defonce a [4 i32])

(defn main [] i32
  (len a))