Tweaking the sealed logic in light of #3097.

Reorganizes children a little so they always come back sorted the same
way the pickler does. Taking advantage of -Yfatal-warnings in the test
case. Review by community.

2 files changed, 32 insertions, 0 deletions

diff --git a/test/files/pos/bug3097.flags b/test/files/pos/bug3097.flags
new file mode 100644
index 0000000000..570b15929d
--- /dev/null
+++ b/test/files/pos/bug3097.flags
@@ -0,0 +1 @@
+-unchecked -Yfatal-warnings
diff --git a/test/files/pos/bug3097.scala b/test/files/pos/bug3097.scala
new file mode 100644
index 0000000000..a034b960f7
--- /dev/null
+++ b/test/files/pos/bug3097.scala
@@ -0,0 +1,31 @@
+package seal
+
+sealed trait ISimpleValue
+
+sealed trait IListValue extends ISimpleValue {
+  def items: List[IAtomicValue[_]]
+}
+sealed trait IAtomicValue[O] extends ISimpleValue {
+  def data: O
+}
+
+sealed trait IAbstractDoubleValue[O] extends IAtomicValue[O] { }
+sealed trait IDoubleValue extends IAbstractDoubleValue[Double]
+
+case class ListValue(val items: List[IAtomicValue[_]]) extends IListValue
+class DoubleValue(val data: Double) extends IDoubleValue {
+  def asDouble = data
+}
+
+object Test {
+  /**
+   * @param args the command line arguments
+   */
+  def main(args: Array[String]): Unit = {
+    val v: ISimpleValue = new DoubleValue(1)
+    v match {
+      case m: IListValue => println("list")
+      case a: IAtomicValue[_] => println("atomic")
+    }
+  }
+}