Integrated contributed non-recursive implementa...

Integrated contributed non-recursive implementation of permutations,
combinations, subsets, by EastSun. Also gave mutable Seqs an in-place
transform method like the one Map has. And couldn't resist slightly
reformulating a few set methods, because how can we settle for
"forall(that.contains)" when we could have "this forall that". (Which is
also what normal people hear when we talk about sets.)

Closes #4060, #3644, review by moors.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/files/run/transform.scala b/test/files/run/transform.scala
new file mode 100644
index 0000000000..250df95df0
--- /dev/null
+++ b/test/files/run/transform.scala
@@ -0,0 +1,8 @@
+object Test {
+  val x = 1 to 10 toBuffer
+
+  def main(args: Array[String]): Unit = {
+    x transform (_ * 2)
+    assert(x.sum == (1 to 10).sum * 2)
+  }
+}