type ('a, 'i, 'j) t
val bind : ('a, 'i, 'j) t ‑> f:('a ‑> ('b, 'j, 'k) t) ‑> ('b, 'i, 'k) t
val map : [ `Define_using_bind | `Custom of ('a, 'i, 'j) t ‑> f:('a ‑> 'b) ‑> ('b, 'i, 'j) t ]
val return : 'a ‑> ('a, 'i, 'i) t