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, 9 insertions, 9 deletions

diff --git a/test/files/run/t6935.scala b/test/files/run/t6935.scala
index dea2d7f2e2..fdaf02e5ce 100644
--- a/test/files/run/t6935.scala
+++ b/test/files/run/t6935.scala
@@ -1,14 +1,14 @@
 object Test {
 
   def main(args: Array[String]): Unit = {
-		  import java.io._
-		  val bytes = new ByteArrayOutputStream()
-		  val out = new ObjectOutputStream(bytes)
-		  out.writeObject(())
-		  out.close()
-		  val buf = bytes.toByteArray
-		  val in = new ObjectInputStream(new ByteArrayInputStream(buf))
-		  val unit = in.readObject()
-		  assert(unit == ())
+    import java.io._
+    val bytes = new ByteArrayOutputStream()
+    val out = new ObjectOutputStream(bytes)
+    out.writeObject(())
+    out.close()
+    val buf = bytes.toByteArray
+    val in = new ObjectInputStream(new ByteArrayInputStream(buf))
+    val unit = in.readObject()
+    assert(unit == ())
   }
 }