1 files changed, 33 insertions, 0 deletions
diff --git a/tests/untried/neg/gadts1.scala b/tests/untried/neg/gadts1.scala
new file mode 100644
index 000000000..08403e6ee
--- /dev/null
+++ b/tests/untried/neg/gadts1.scala
@@ -0,0 +1,33 @@
+object Test{
+
+abstract class Number
+case class Int(n: scala.Int) extends Number
+case class Double(d: scala.Double) extends Number
+
+trait Term[+a]
+case class Cell[a](var x: a) extends Term[a]
+case class NumTerm(val n: Number) extends Term[Number]
+class IntTerm(n: Int) extends NumTerm(n) with Term[Int]
+
+
+def f[a](t:Term[a], c:Cell[a]): Unit = {
+  t match {
+    case NumTerm(n) => c.x = Double(1.0)
+  }
+  t match {
+    // presently testing that this gets past the parser: eventually
+    // it should actually work.
+    case Cell[a](x: Int) => c.x = 5
+  }
+}
+
+
+val x:Term[Number] = NumTerm(Int(5))
+
+def main(args: Array[String]): Unit = {
+  val cell = Cell[Int](Int(6))
+  Console.println(cell)
+  f[Int](new IntTerm(Int(5)), cell)
+  Console.println(cell)
+}
+}