Big realizability refactoring

Move logic from TypeOps to new file CheckRealizable.scala.
Also check realizable fields under strict mode.
Check at phase PostTyper rather than Typer to avoid cycles.
New tests for imports and deep paths.

1 files changed, 5 insertions, 4 deletions

diff --git a/tests/neg/i1050a.scala b/tests/neg/i1050a.scala
index 47e2f0c59..4fea5e3b1 100644
--- a/tests/neg/i1050a.scala
+++ b/tests/neg/i1050a.scala
@@ -1,12 +1,13 @@
+// i1050 checks failing at refchecks
 object Tiark1 {
     trait A { type L <: Nothing }
     trait B { type L >: Any}
     trait U {
       val p: B
-      def brand(x: Any): p.L = x // error: not final
+      def brand(x: Any): p.L = x
     }
     trait V extends U {
-      lazy val p: A & B = ???
+      lazy val p: A & B = ??? // error: may not override
     }
     val v = new V {}
     v.brand("boom!")
@@ -17,11 +18,11 @@ object Tiark2 {
     trait U {
       type X <: B
       val p: X
-      def brand(x: Any): p.L = x // error: not final
+      def brand(x: Any): p.L = x
     }
     trait V extends U {
       type X = B & A
-      lazy val p: X = ???
+      lazy val p: X = ???  // error: may not override
     }
     val v = new V {}
     v.brand("boom!"): Nothing