Added auto-tupling.

Auto-tupling should satisfy the following spec.

1. An application `f(args)` where `f` is a non-overloaded method which has a single, non-repeated parameter as its
first parameter list and where args consists of two or more arguments is expanded to `f((args))`.

2. A constructor pattern `C(args)` where `C.unapply` is a non-overloaded method which has a single, non-repeated parameter as its first parameter list and where args consists of two or more arguments is expanded to `C((args))`.

Auto-tupling can be disabled by language feature "noAutoTupling".

Conflicts:
	test/dotc/tests.scala

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/pos/autoTuplingTest.scala b/tests/pos/autoTuplingTest.scala
new file mode 100644
index 000000000..523411a1a
--- /dev/null
+++ b/tests/pos/autoTuplingTest.scala
@@ -0,0 +1,9 @@
+object autoTupling {
+
+  val x = Some(1, 2)
+
+  x match {
+    case Some(a, b) => a + b
+    case None =>
+  }
+}