Merge pull request #1364 from dotty-staging/exhaustivity2

Implementation of exhaustivity and redundancy check

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/patmat/t3683.scala b/tests/patmat/t3683.scala
new file mode 100644
index 000000000..44be9d6c6
--- /dev/null
+++ b/tests/patmat/t3683.scala
@@ -0,0 +1,19 @@
+sealed trait Foo
+sealed trait Bar extends Foo
+sealed trait W[T >: Bar <: Foo]
+sealed case class X() extends W[Foo]
+sealed case class Y() extends W[Bar]
+sealed case class Z[T >: Bar <: Foo](
+  z1: W[T]
+) extends W[T]
+
+object Main {
+  def func(w: W[Bar]): Int = {
+    w match {
+      // Error if I include it, warning if I do not!
+      // case X() => 2
+      case Y() => 1
+      case Z(z) => func(z)
+    }
+  }
+}