make test runnable

Author: liufengyun

tests/run/i1748.check

@@ -0,0 +1,2 @@
+class
+ extends

tests/pos/i1784.scala renamed to tests/run/i1748.scala

@@ -1,13 +1,13 @@
 object Test {
   implicit class Foo(sc: StringContext) {
     object q {
-      def unapply(args: Any*): Option[(Any, Any)] =
+      def unapply(arg: Any): Option[(Any, Any)] =
         Some((sc.parts(0), sc.parts(1)))
     }
   }
 
-  def f(defn: Any): Any = {
-    val q"class $name extends $parent" =  defn
+  def main(args: Array[String]): Unit = {
+    val q"class $name extends $parent" = new Object
     println(name)
     println(parent)
   }