Merge pull request #5106 from milessabin/topic/hkgadt

SI-9760 Fix for higher-kinded GADT refinement

1 files changed, 35 insertions, 0 deletions

diff --git a/test/files/pos/hkgadt.scala b/test/files/pos/hkgadt.scala
new file mode 100644
index 0000000000..5719c752cd
--- /dev/null
+++ b/test/files/pos/hkgadt.scala
@@ -0,0 +1,35 @@
+object HKGADT {
+  sealed trait Foo[F[_]]
+  final case class Bar() extends Foo[List]
+
+  def frob[F[_]](foo: Foo[F]): F[Int] =
+    foo match {
+      case Bar() => List(1)
+    }
+
+  sealed trait Foo1[F]
+  final case class Bar1() extends Foo1[Int]
+  def frob1[A](foo: Foo1[A]): A = foo match {
+    case Bar1() => 1
+  }
+}
+
+object HKGADT2 {
+  sealed trait Foo[F[_]]
+  final case class Bar() extends Foo[List]
+  final case class Baz() extends Foo[Set]
+
+  def frob[F[_]](foo: Foo[F]): F[Int] =
+    foo match {
+      case Bar() => List(1)
+      case Baz() => Set(1)
+    }
+
+  sealed trait Foo1[F]
+  final case class Bar1() extends Foo1[Int]
+  final case class Baz1() extends Foo1[Boolean]
+  def frob1[A](foo: Foo1[A]): A = foo match {
+    case Bar1() => 1
+    case Baz1() => true
+  }
+}