Add additional test

Author: abeln

tests/run/i5067b.check

@@ -0,0 +1,3 @@
+match error
+match error nested
+not implemented error

tests/run/i5067b.scala

@@ -0,0 +1,33 @@
+object Test {
+  def main(args: Array[String]): Unit = {
+      class B[T] {}
+      object B {
+        def unapply[T](x: Any): Option[B[T]] = None
+      }
+      try {
+        val B(_) = null
+      } catch {
+        case e: MatchError => println("match error")
+      }
+
+      null match {
+        case null =>
+          try {
+            null match {
+              case Some(_) => ()
+            }
+          } catch {
+            case e: MatchError => println("match error nested")
+          }
+      }
+
+      try {
+        ??? match {
+          case (_, _) => ()
+          case _ => ()
+        }
+      } catch {
+        case e: NotImplementedError => println("not implemented error")
+      }
+  }
+}