Fix SI-2712

Allows partially instantiated types as type constrictors when inferring higher-kinded
types.

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/pos/t2712-7.scala b/tests/pos/t2712-7.scala
new file mode 100644
index 000000000..d9c5243f1
--- /dev/null
+++ b/tests/pos/t2712-7.scala
@@ -0,0 +1,15 @@
+package test
+
+// Cats Xor, Scalaz \/, scala.util.Either
+sealed abstract class Xor[+A, +B] extends Product with Serializable
+object Xor {
+  final case class Left[+A](a: A) extends (A Xor Nothing)
+  final case class Right[+B](b: B) extends (Nothing Xor B)
+}
+
+object TestXor {
+  import Xor._
+  def meh[F[_], A, B](fa: F[A])(f: A => B): F[B] = ???
+  meh(new Right(23): Xor[Boolean, Int])(_ < 13)
+  meh(new Left(true): Xor[Boolean, Int])(_ < 13)
+}