Over_arrow_with_left.Left
type ('a, 'b) t = ('a, 'b) Arrow.t
The type held by the Arrow_choice.
Arrow_choice
val left : ('a, 'b) t -> (('a, 'c) Stdlib.Either.t, ('b, 'c) Stdlib.Either.t) t
Feed marked inputs through the argument arrow, passing the rest through unchanged to the output.