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, 1 insertions, 6 deletions

diff --git a/test/files/run/t5629b.scala b/test/files/run/t5629b.scala
index 9ff29c8d89..5d402201ae 100644
--- a/test/files/run/t5629b.scala
+++ b/test/files/run/t5629b.scala
@@ -1,8 +1,3 @@
-
-
-
-
-
 object Test extends App {
 
   trait MyPF[@specialized(Int) -A] extends (A => Unit) {
@@ -16,7 +11,7 @@ object Test extends App {
   trait MySmartPF[@specialized(Int) -A] extends MyPF[A] {
     def apply(x: A): Unit = {
       println("MySmartPF.apply entered...")
-      applyOrElse(x, { _: Any => throw new MatchError })
+      applyOrElse(x, { default: Any => throw new MatchError(default) })
     }
   }