Fix SI-2712

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

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/neg/i94-nada.scala b/tests/neg/i94-nada.scala
new file mode 100644
index 000000000..8ca104e06
--- /dev/null
+++ b/tests/neg/i94-nada.scala
@@ -0,0 +1,11 @@
+trait Test1 {
+  trait Monad[MX] {
+    def x: MX
+  }
+  sealed abstract class Either[A,B]
+  case class Left[A,B](x: A) extends Either[A,B] with Monad[A]
+  case class Right[A,B](x: B) extends Either[A,B] with Monad[B]
+  def flatMap[FX,FY,M[FMX]<:Monad[FMX]](m: M[FX], f: FX => M[FY]): M[FY] = f(m.x)
+  println(flatMap(Left(1), {x: Int => Left(x)})) // error: Left does not conform to [X] -> Monad[X]
+
+}