New version of the back-end, which is marter about () in else branches.

sjrd · sjrd · commit 592731d366bc · 2018-08-28T20:58:35.000+02:00
This removes the last nop's generating by the `Labeled`-based
pattern matcher.
diff --git a/scala-backend b/scala-backend
@@ -1 +1 @@
-Subproject commit 011d5c333d52fc6d9e45b9e33614abe9ac19a851
+Subproject commit 239bd897400ddb0a962dabadff274e38921b864b
