Categorize more tests

All pos tests up to 3999 have been triaged. One new test in pending.

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/pos/t3578.scala b/tests/pos/t3578.scala
new file mode 100644
index 000000000..2ce92a776
--- /dev/null
+++ b/tests/pos/t3578.scala
@@ -0,0 +1,30 @@
+object Test {
+  sealed abstract class JValue {
+    def ++(other: JValue) = {
+      def append(value1: JValue, value2: JValue): JValue = (value1, value2) match {
+    case (JNothing, x) => x
+    case (x, JNothing) => x
+    case (JObject(xs), x: JField) => JObject(xs ::: List(x))
+    case (x: JField, JObject(xs)) => JObject(x :: xs)
+    case (JArray(xs), JArray(ys)) => JArray(xs ::: ys)
+    case (JArray(xs), v: JValue) => JArray(xs ::: List(v))
+    case (v: JValue, JArray(xs)) => JArray(v :: xs)
+    case (f1: JField, f2: JField) => JObject(f1 :: f2 :: Nil)
+    case (JField(n, v1), v2: JValue) => JField(n, append(v1, v2))
+    case (x, y) => JArray(x :: y :: Nil)
+      }
+      append(this, other)
+    }
+  }
+
+  case object JNothing extends JValue
+  case object JNull extends JValue
+  case class JString(s: String) extends JValue
+  case class JDouble(num: Double) extends JValue
+  case class JInt(num: BigInt) extends JValue
+  case class JBool(value: Boolean) extends JValue
+  case class JField(name: String, value: JValue) extends JValue
+  case class JObject(obj: List[JField]) extends JValue
+  case class JArray(arr: List[JValue]) extends JValue
+}
+