add error messages

Author: esarbe

compiler/test/dotty/tools/dotc/reporting/ErrorMessagesTests.scala

@@ -1010,4 +1010,21 @@ class ErrorMessagesTests extends ErrorMessagesTest {
     assertEquals(extender.show, "class B")
     assertEquals(parent.show, "class A")
   }
+
+  @Test def tailrecNotApplicableNeitherPrivateNorFinal =
+    checkMessagesAfter("tailrec") {
+    """
+      |class Foo {
+      |
+      |  @scala.annotation.tailrec
+      |  def foo: Unit = foo
+      |
+      |}
+    """.stripMargin
+    }.expect { (ictx, messages) =>
+      implicit val ctx: Context = ictx
+      assertMessageCount(1, messages)
+      val TailrecNotApplicableNeitherPrivateNorFinal(symbol) :: Nil = messages
+      assertEquals(symbol.show, "method foo")
+    }
 }