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t >>= f returns a computation that sequences the computations represented by two monad elements. The resulting computation first does
t to yield a value
v, and then runs the computation returned by
module Monad_infix : sig ... end
val return : 'a -> 'a t
return v returns the (trivial) computation that returns v.
ignore_m t is
map t ~f:(fun _ -> ()).
ignore_m used to be called
ignore, but we decided that was a bad name, because it shadowed the widely used
Caml.ignore. Some monads still do
let ignore = ignore_m for historical reasons.
all, but ensures that every monadic value in the list produces a unit value, all of which are discarded rather than being collected into a list.