* parse.y (stmt): explicit error for "Object::Far += foo 1" just

as "Object::Far += 1".

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@21520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Jan 15 14:17:57 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* parse.y (stmt): explicit error for "Object::Far += foo 1" just
+	  as "Object::Far += 1".
+
 Thu Jan 15 13:10:58 2009  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/Makefile.sub (COMPILERFLAG): for enc/trans/gb18030.c.

parse.y

@@ -1100,6 +1100,11 @@ stmt		: keyword_alias fitem {lex_state = EXPR_FNAME;} fitem
 			$$ = dispatch3(opassign, $$, $4, $5);
 		    %*/
 		    }
+		| primary_value tCOLON2 tCONSTANT tOP_ASGN command_call
+		    {
+			yyerror("constant re-assignment");
+			$$ = 0;
+		    }
 		| primary_value tCOLON2 tIDENTIFIER tOP_ASGN command_call
 		    {
 		    /*%%%*/