SI-8035 Deprecate automatic () insertion in argument lists

This promotes the () insertion warning from -Ywarn-adapted-args to a
deprecation warning. -Xfuture tunrs it into a compiler error.

Auto tupling remains unchanged for now.

The tests have been fixed the following way:
- Warnings caused by general sloppiness (Try(), Future(), ...) have been
  fixed.
- Warnings which raise interesting questions (x == (), ...) received an
  updated checkfile for now.

1 files changed, 10 insertions, 0 deletions

diff --git a/test/files/neg/t8035-removed.scala b/test/files/neg/t8035-removed.scala
new file mode 100644
index 0000000000..6423157530
--- /dev/null
+++ b/test/files/neg/t8035-removed.scala
@@ -0,0 +1,10 @@
+object Foo {
+  List(1,2,3).toSet()
+
+  class A[T](val x: T)
+  new A
+
+  import java.text.SimpleDateFormat
+  val sdf = new SimpleDateFormat("yyyyMMdd-HH0000")
+  sdf.format()
+}