EitherEffect require syntax

Example.kt

import arrow.core.Either
import arrow.core.computations.EitherEffect
import arrow.core.computations.either

suspend fun <E> EitherEffect<E, *>.require(test: Boolean, fail: () -> E): Unit =
  if (test) Unit
  else Either.Left(fail()).bind()

suspend fun <E> EitherEffect<E, *>.error(error: E): Unit =
  Either.Left(error).bind()

object CustomError

suspend fun main() {
 val x: Either<CustomError, Long> = either {
   require(10 > 1) { CustomError }

   error(CustomError)

   1L
 }