  f_arg_item:
    f_norm_arg
  | tLPAREN f_margs rparen
-@@ -599,12 +609,12 @@
-   blkarg_mark tIDENTIFIER
- opt_f_block_arg:
-   tCOMMA f_block_arg
--|
-+| none
- singleton:
-   var_ref
- | tLPAREN2 expr rparen
- assoc_list:
--
-+  none
- | assocs trailer
- assocs:
-   assoc

   tAMPER arg_value
 opt_block_arg:
   tCOMMA block_arg
-|
+| tCOMMA
+| none
 args:
   arg_value
 | tSTAR arg_value

 | operation brace_block
 | method_call
 | method_call brace_block
@@ -516,14 +527,13 @@
 | tFLOAT
 | tUMINUS_NUM tINTEGER =tLOWEST
