Add test for import with a rest parameter, invalid syntax

src/dynamic-import/no-rest-param.case

+// Copyright (C) 2018 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+desc: ImportCall is not extensible - no rest parameter
+template: syntax/invalid
+info: |
+  ImportCall :
+      import( AssignmentExpression[+In, ?Yield] )
+
+  Forbidden Extensions
+
+  - ImportCall must not be extended.
+
+  This production doesn't allow the following production from ArgumentsList:
+  
+  ... AssignmentExpression
+---*/
+
+//- import
+import(...[''])