arrow-optics / arrow.optics / PIso / left
open fun <C> left(): PIso<Either<S, C>, Either<T, C>, Either<A, C>, Either<B, C>>
open fun <C> left():
PIso
<Either<S, C>, Either<T, C>, Either<A, C>, Either<B, C>>
Create a sum of the PIso and a type C
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