package preface

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Minimal definition using left operation without Arrow.

type ('a, 'b) t

The type held by the Arrow_choice.

val left : ('a, 'b) t -> (('a, 'c) Preface_core.Shims.Either.t, ('b, 'c) Preface_core.Shims.Either.t) t

Feed marked inputs through the argument arrow, passing the rest through unchanged to the output.