* parse.y (opt_block_arg): Allow a trailing comma at the end of

an argument list.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@29440 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Oct 11 18:06:57 2010  Akinori MUSHA  <knu@iDaemons.org>
+
+	* parse.y (opt_block_arg): Allow a trailing comma at the end of
+	  an argument list.
+
 Fri Oct  8 10:51:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* common.mk (RBCONFIG): depends on version.h due to

NEWS

@@ -28,6 +28,17 @@ with all sufficient information, see the ChangeLog file.
   equivalent to f.call(x), is supported.  This is mainly for use
   in invoking a Proc.
 
+* trailing comma in argument list
+
+  A trailing comma can be put at the end of an argument list.
+  e.g.
+    MyStruct = Struct.new(
+      :id,
+      :name,
+      :created_at,
+      :description,
+    )
+
 === Configuration changes
 
 * version specific directories

parse.y

@@ -1423,6 +1423,10 @@ opt_block_arg	: ',' block_arg
 		    {
 			$$ = $2;
 		    }
+		| ','
+		    {
+			$$ = 0;
+		    }
 		| none
 		;