[AST] Add method to concatenate AstRawStrings

test/mjsunit/harmony/class-privates-delete.js

Index: test/mjsunit/harmony/class-privates-delete.js
diff --git a/test/mjsunit/harmony/class-fields-arguments.js b/test/mjsunit/harmony/class-privates-delete.js
similarity index 56%
copy from test/mjsunit/harmony/class-fields-arguments.js
copy to test/mjsunit/harmony/class-privates-delete.js
index 133957b4c1706c7db0d601a1c774e5f0f5a2fbd8..9a8cb91ef8784f2886017e7f25511847bd869be4 100644
--- a/test/mjsunit/harmony/class-fields-arguments.js
+++ b/test/mjsunit/harmony/class-privates-delete.js
@@ -2,13 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-class-fields
+// Flags: --harmony-private-class-fields
 
 {
   class C {
-    a = (arguments[0] = 0, assertEquals(0, arguments[0]));
-    b = assertEquals(arguments[0], undefined);
+    #a;
+    d() {
+      delete #a; // TODO(bakkot) this should be a syntax error
+    }
   }
 
-  new C;
+  (new C).d();
 }