Merge pull request #1364 from dotty-staging/exhaustivity2

Implementation of exhaustivity and redundancy check

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/patmat/virtpatmat_reach_sealed_unsealed.scala b/tests/patmat/virtpatmat_reach_sealed_unsealed.scala
new file mode 100644
index 000000000..13911dbd7
--- /dev/null
+++ b/tests/patmat/virtpatmat_reach_sealed_unsealed.scala
@@ -0,0 +1,21 @@
+sealed abstract class X
+sealed case class A(x: Int) extends X
+
+// test reachability on mixed sealed / non-sealed matches
+object Test extends App {
+  val B: X = A(0)
+  val C: X = A(1)
+
+  // all cases are reachable and the match is exhaustive
+  (C: X) match {
+    case B =>
+    case C =>
+    case A(_) =>
+  }
+
+  (true: Boolean) match { case true => } // not exhaustive, but reachable
+  (true: Boolean) match { case true => case false => } // exhaustive, reachable
+  (true: Boolean) match { case true => case false =>  case _ => } // exhaustive, last case is unreachable
+  (true: Boolean) match { case true => case false =>  case _: Boolean => } // exhaustive, last case is unreachable
+  (true: Boolean) match { case true => case false =>  case _: Any => } // exhaustive, last case is unreachable
+}
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