diff -r 4b5461dcd190 Grammar/Grammar
--- a/Grammar/Grammar	Wed May 13 15:02:12 2015 +0300
+++ b/Grammar/Grammar	Wed May 13 10:05:33 2015 -0400
@@ -136,7 +136,7 @@
 # that precede iterable unpackings are blocked; etc.
 argument: ( test [comp_for] |
             test '=' test |
-            '**' expr |
+            '**' test |
             star_expr )
 
 comp_iter: comp_for | comp_if