8000 Difference in the Applicative inferred for Seq[Seq[?]]#sequence between Scala 2 and 3 · Issue #4545 · typelevel/cats · GitHub

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Difference in the Applicative inferred for Seq[Seq[?]]#sequence between Scala 2 and 3 #4545

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s5bug opened this issue Jan 4, 2024 · 1 comment

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s5bug commented

Minimized:

import cats.syntax.all._

Seq(Seq()).sequence

Infers Seq[Seq[ in Scala 2, but Int => Seq[ in Scala 3.

Original use case, encountered in #scala-users:

import cats.syntax.all._

for {
  x <- Seq(0, 1, 2).permutations
  y <- Seq(Seq(-1, 1), Seq(-1, 1), Seq(-1, 1)).sequence
} yield (x, y)

The text was updated successfully, but these errors were encountered:

Leon0402 commented

Same issue with Option[Sequence[A]] in scala 3.

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