Merge pull request #4093 from dotty-staging/add-test-for-#2456

Add test for #2456

Author: odersky

tests/run/i2456.check

@@ -0,0 +1 @@
+buzzzzzzz

tests/run/i2456.scala

@@ -0,0 +1,13 @@
+class Bees {
+  def f: PartialFunction[Bee, Unit] = {  case Bee(_) => println("buzzzzzzz")  }
+
+  f(new Bee("buzz"))
+
+  case class Bee(value: String)
+}
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    new Bees
+  }
+}