Put more implementation restrictions on value classes.

Nested objects, classes and lazy vals are disallowed at any
nesting level in value classes; e.g. lazy vals local to a
method defined in a value class. There are still allowed in
universal traits.

This is a temporary, implementation restriction that is planned
to be addressed in future releases of Scala. Error messages has
been updated to communicate that intent.

Moved tests for SI-5582 and SI-6408 to pending folder. They have
to stay there until implementation restrictions are addressed.

Closes SI-6408 and SI-6432.

Review by @odersky, @harrah and @adriaanm.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/pending/run/t6408.scala b/test/pending/run/t6408.scala
new file mode 100644
index 0000000000..ff17480b35
--- /dev/null
+++ b/test/pending/run/t6408.scala
@@ -0,0 +1,11 @@
+class X(val i: Int) extends AnyVal {
+  class Inner(val q: Int) {
+    def plus = i + q
+  }
+}
+
+object Test extends App {
+  val x = new X(11)
+  val i = new x.Inner(22)
+  assert(i.plus == 33)
+}