better error when typetagging local classes

Inspired by https://issues.scala-lang.org/browse/SI-6649

2 files changed, 2 insertions, 2 deletions

diff --git a/src/compiler/scala/reflect/reify/Errors.scala b/src/compiler/scala/reflect/reify/Errors.scala
index b8b5f8033b..3d7cb95792 100644
--- a/src/compiler/scala/reflect/reify/Errors.scala
+++ b/src/compiler/scala/reflect/reify/Errors.scala
@@ -28,7 +28,7 @@ trait Errors {
   }
 
   def CannotReifyWeakType(details: Any) = {
-    val msg = "cannot create a TypeTag" + details
+    val msg = "cannot create a TypeTag" + details + ": use WeakTypeTag instead"
     throw new ReificationException(defaultErrorPosition, msg)
   }
 
diff --git a/test/files/neg/t6323a.check b/test/files/neg/t6323a.check
index 670247887c..a80c9a0a81 100644
--- a/test/files/neg/t6323a.check
+++ b/test/files/neg/t6323a.check
@@ -1,6 +1,6 @@
 t6323a.scala:11: `package`.this.materializeTypeTag[Test](scala.reflect.runtime.`package`.universe) is not a valid implicit value for reflect.runtime.universe.TypeTag[Test] because:
 failed to typecheck the materialized tag: 
-cannot create a TypeTag referring to local class Test.Test
+cannot create a TypeTag referring to local class Test.Test: use WeakTypeTag instead
       val value = u.typeOf[Test]
                           ^
 t6323a.scala:11: error: No TypeTag available for Test