Either (loko.Loko.Either)

val map : 
  ( 'SL, 'FL, 'GL, 'TL ) optic ->
  ( 'SR, 'FR, 'GR, 'TR ) optic ->
  ( ( 'SL, 'SR ) Stdlib.Either.t,
    ( 'FL, 'FR ) Stdlib.Either.t,
    ( 'GL, 'GR ) Stdlib.Either.t,
    ( 'TL, 'TR ) Stdlib.Either.t )
    optic

An isomorphism between eithers.

val on_left : 
  ( ( 'F, 'S ) Stdlib.Either.t, 'F, 'G, ( 'G, 'S ) Stdlib.Either.t ) optic

A prism that focuses on Left.

val on_right : 
  ( ( 'S, 'F ) Stdlib.Either.t, 'F, 'G, ( 'S, 'G ) Stdlib.Either.t ) optic

A prism that focuses on Right.