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, 1 deletions

diff --git a/test/files/run/partialfun.scala b/test/files/run/partialfun.scala
index f3c53b94ae..71c7d3e61c 100644
--- a/test/files/run/partialfun.scala
+++ b/test/files/run/partialfun.scala
@@ -76,7 +76,7 @@ object Test {
     }
 
     val chained = pf0 orElse pf1 orElse pf2
-    chained()
+    chained(())
   }
 
   def main(args: Array[String]): Unit = {