fixed #2500: refactoring collections so that a ...

fixed #2500: refactoring collections so that a `collection.{Map|SortedMap|SortedSet}` can be built from the corresponding collection (thus, do not require the immutable one)

pulling up newBuilder method from Immutable*Factory to *Factory, and
inheriting *Factory in scala.collection companion objects, instead of
the Immutable*Factory this way, you can, e.g., build a collection.Map
from a collection.Map (instead of requiring an immutable.Map)

1 files changed, 6 insertions, 0 deletions

diff --git a/test/files/pos/t2500.scala b/test/files/pos/t2500.scala
new file mode 100644
index 0000000000..76dea4cf8d
--- /dev/null
+++ b/test/files/pos/t2500.scala
@@ -0,0 +1,6 @@
+object Test {
+	import scala.collection._
+	((Map(1 -> "a", 2 -> "b"): collection.Map[Int, String]) map identity[(Int, String)]) : scala.collection.Map[Int,String]
+	((SortedMap(1 -> "a", 2 -> "b"): collection.SortedMap[Int, String]) map identity[(Int, String)]): scala.collection.SortedMap[Int,String]
+	((SortedSet(1, 2): collection.SortedSet[Int]) map identity[Int]): scala.collection.SortedSet[Int]
+}
\ No newline at end of file