Run tests as they were in scala.

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/pending/run/gadts.scala b/tests/pending/run/gadts.scala
new file mode 100644
index 000000000..57c7fc8af
--- /dev/null
+++ b/tests/pending/run/gadts.scala
@@ -0,0 +1,17 @@
+abstract class Term[T]
+case class Lit(x: Int) extends Term[Int]
+case class Succ(t: Term[Int]) extends Term[Int]
+case class IsZero(t: Term[Int]) extends Term[Boolean]
+case class If[T](c: Term[Boolean],
+                 t1: Term[T],
+                 t2: Term[T]) extends Term[T]
+
+object Test extends App {
+  def eval[T](t: Term[T]): T = t match {
+    case Lit(n)        => n
+    case Succ(u)       => eval(u) + 1
+    case IsZero(u)     => eval(u) == 0
+    case If(c, u1, u2) => eval(if (eval(c)) u1 else u2)
+  }
+  println(eval(If(IsZero(Lit(1)), Lit(41), Succ(Lit(41)))))
+}