Test that #1614 remains fixed.

Author: DarkDimius

tests/pos/tailcall/i1614.scala

@@ -0,0 +1,9 @@
+object Foobar {
+  def apply(): Option[String] = { 
+    def foobar[A](f: (String, String) => A): List[A] = List[String]() match { 
+      case _ :: ls => foobar(f) 
+    } 
+    foobar((a1, a2) => (a1 + a2)).headOption 
+  } 
+}
+