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make tailRecMStackSafety lazy val #1465

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Nov 28, 2016
Merged

make tailRecMStackSafety lazy val #1465

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2 changes: 1 addition & 1 deletion laws/src/main/scala/cats/laws/MonadLaws.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ trait MonadLaws[F[_]] extends ApplicativeLaws[F] with FlatMapLaws[F] {
def mapFlatMapCoherence[A, B](fa: F[A], f: A => B): IsEq[F[B]] =
fa.flatMap(a => F.pure(f(a))) <-> fa.map(f)

val tailRecMStackSafety: IsEq[F[Int]] = {
lazy val tailRecMStackSafety: IsEq[F[Int]] = {
val n = 50000
val res = F.tailRecM(0)(i => F.pure(if (i < n) Either.left(i + 1) else Either.right(i)))
res <-> F.pure(n)
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