closes #2741, #4079: pickling now ensures that ...

closes #2741, #4079: pickling now ensures that a local type param with
a non-local owner, which will thus get a localized owner, will only get
a class as its localized owner if its old owner was a class (otherwise,
NoSymbol) this ensures that asSeenFrom does not treat typerefs to this
symbol differently after pickling.

todo: should we pro-actively set the owner of these type params to
something else than the type alias that they originate from? see notes
in typeFunAnon

review by odersky

2 files changed, 14 insertions, 0 deletions

diff --git a/test/files/pos/t2741/2741_1.scala b/test/files/pos/t2741/2741_1.scala
new file mode 100644
index 0000000000..d47ed3b6cb
--- /dev/null
+++ b/test/files/pos/t2741/2741_1.scala
@@ -0,0 +1,9 @@
+trait Partial {
+  type Apply[XYZ] = List[XYZ]
+}
+trait MA[M[_]]
+trait MAs {
+  val a: MA[Partial#Apply] = null // after compilation, the type is pickled as `MA[ [B] List[B] ]`
+}
+
+object Scalaz extends MAs
\ No newline at end of file
diff --git a/test/files/pos/t2741/2741_2.scala b/test/files/pos/t2741/2741_2.scala
new file mode 100644
index 0000000000..41f6a64260
--- /dev/null
+++ b/test/files/pos/t2741/2741_2.scala
@@ -0,0 +1,5 @@
+// object Test compiles jointly, but not separately.
+object Test {
+  import Scalaz._
+  Scalaz.a
+}
\ No newline at end of file