Move files out of the dotty package

- Remove unused classes Pair and Singleton.
- Move classes from dotty.annotation.internal
  to scala.annotation.internal.

The only classes remaining now are in dotty.runtime
and DottyPredef. We should probably do something about them
as well at some point.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/scala/annotation/internal/Alias.scala b/src/scala/annotation/internal/Alias.scala
new file mode 100644
index 000000000..e3f56e70c
--- /dev/null
+++ b/src/scala/annotation/internal/Alias.scala
@@ -0,0 +1,10 @@
+package scala.annotation.internal
+
+import scala.annotation.Annotation
+
+/** An annotation to record a Scala2 pickled alias.
+ *  @param aliased  A TermRef pointing to the aliased field.
+ */
+class Alias(aliased: Any) extends Annotation {
+
+}