Flipped varargs eta-expansion behavior.

(T*)U now eta-expands to Seq[T] => U, not T* => U. There is a transition
command line switch to get the old behavior for any who may have relied
upon it:

  -Yeta-expand-keeps-star

Closes SI-4176, no review.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/files/neg/eta-expand-star.scala b/test/files/neg/eta-expand-star.scala
new file mode 100644
index 0000000000..5749692522
--- /dev/null
+++ b/test/files/neg/eta-expand-star.scala
@@ -0,0 +1,8 @@
+object Test {
+  def f[T](xs: T*): Unit = ()
+  def g[T] = f[T] _
+
+  def main(args: Array[String]): Unit = {
+    g(1, 2)
+  }
+}