Disallow refinements of types or methods that do not appear in parent.

We planned this for a long time but never implemented it. Instead, we sometimes
issued an erro in Splitter, namely if reflection would have been needed to access the
member. It turns out that some tests (e.g. neg/t625) fail -Ycheck (we knew that before
and disabled) but also fail Pickling because they generate orhpan PolyParams. So rather
than patching this up it seems now is a good time to enforce the restriction for real.

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/pos/typers.scala b/tests/pos/typers.scala
index fe11ca602..7f67d2c72 100644
--- a/tests/pos/typers.scala
+++ b/tests/pos/typers.scala
@@ -88,6 +88,7 @@ object typers {
   }
 
   class Refinements {
+    trait C { type T; def process(x: T): Int }
     val y: C { type T; val key: T; def process(x: T): Int } = ???
   }