SI-6963 Add version to -Xmigration

Adds an optional version parameter to the -Xmigration compiler setting.
Doing -Xmigration without version number behaves as it used to by
dumping every possible migration warning.

This commit adds a ScalaVersion class (plus ancillary stuff), and a
ScalaVersionSetting.

1 files changed, 5 insertions, 0 deletions

diff --git a/test/files/neg/t6963a.scala b/test/files/neg/t6963a.scala
new file mode 100644
index 0000000000..b3366b2557
--- /dev/null
+++ b/test/files/neg/t6963a.scala
@@ -0,0 +1,5 @@
+object Test {
+  import scala.collection.mutable._
+  
+  List(1,2,3,4,5).scanRight(0)(_+_)
+}