don't introduce a deprecated syntax

mysql-test/r/myisam.result

@@ -1421,15 +1421,6 @@ create table t3 (c1 int) engine=myisam pack_keys=default;
 create table t4 (c1 int) engine=myisam pack_keys=2;
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '2' at line 1
 drop table t1, t2, t3;
-create table t1 (a int not null, key `a` key_block_size=1024 (a));
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `a` int(11) NOT NULL,
-  KEY `a` KEY_BLOCK_SIZE=1024 (`a`)
-) ENGINE=MyISAM DEFAULT CHARSET=latin1
-drop table t1;
-set @@new=1;
 create table t1 (a int not null, key `a` (a) key_block_size=1024);
 show create table t1;
 Table	Create Table
@@ -1574,4 +1565,5 @@ t1	CREATE TABLE `t1` (
 drop table t1;
 create table t1 (a int not null, key key_block_size=1024 (a));
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '=1024 (a))' at line 1
-set @@new=0;
+create table t1 (a int not null, key `a` key_block_size=1024 (a));
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key_block_size=1024 (a))' at line 1

mysql-test/t/myisam.test

@@ -811,13 +811,6 @@ drop table t1, t2, t3;
 # Test of key_block_size
 #
 
-# Old format, to be obsolete in 5.3
-create table t1 (a int not null, key `a` key_block_size=1024 (a));
-show create table t1;
-drop table t1;
-
-set @@new=1;
-
 create table t1 (a int not null, key `a` (a) key_block_size=1024);
 show create table t1;
 drop table t1;
@@ -874,5 +867,6 @@ drop table t1;
 
 --error 1064
 create table t1 (a int not null, key key_block_size=1024 (a));
+--error 1064
+create table t1 (a int not null, key `a` key_block_size=1024 (a));
 
-set @@new=0;

sql/sql_show.cc

@@ -1100,12 +1100,6 @@ store_create_info(THD *thd, TABLE_LIST *table_list, String *packet,
     if (!found_primary)
      append_identifier(thd, packet, key_info->name, strlen(key_info->name));
 
-#if MYSQL_VERSION_ID < 50300
-    /* Key options moved to after key parts in 5.3.0 */
-    if (!thd->variables.new_mode)
-      store_key_options(thd, packet, table, key_info);
-#endif
-
     packet->append(STRING_WITH_LEN(" ("));
 
     for (uint j=0 ; j < key_info->key_parts ; j++,key_part++)
@@ -1130,10 +1124,7 @@ store_create_info(THD *thd, TABLE_LIST *table_list, String *packet,
       }
     }
     packet->append(')');
-#if MYSQL_VERSION_ID < 50300
-    if (thd->variables.new_mode)
-#endif
-      store_key_options(thd, packet, table, key_info);
+    store_key_options(thd, packet, table, key_info);
     if (key_info->parser)
     {
       packet->append(" WITH PARSER ", 13);

sql/sql_yacc.yy

@@ -796,7 +796,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 	key_type opt_unique_or_fulltext constraint_key_type
 
 %type <key_alg>
-	opt_btree_or_rtree
+	btree_or_rtree
 
 %type <string_list>
 	key_usage_list using_list
@@ -887,7 +887,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
         view_suid view_tail view_list_opt view_list view_select
         view_check_option trigger_tail sp_tail
         install uninstall partition_entry binlog_base64_event
-	init_key_options key_options key_opts key_opt
+	init_key_options key_options key_opts key_opt key_using_alg
 END_OF_INPUT
 
 %type <NONE> call sp_proc_stmts sp_proc_stmts1 sp_proc_stmt
@@ -4528,7 +4528,7 @@ init_key_options:
 
 key_alg:
 	/* empty */ init_key_options
-	| init_key_options key_opts
+	| init_key_options key_using_alg
 	;
 
 key_options:
@@ -4540,10 +4540,14 @@ key_opts:
 	key_opt
 	| key_opts key_opt
 	;
-	
+
+key_using_alg:
+	USING btree_or_rtree       { Lex->key_create_info.algorithm= $2; }
+	| TYPE_SYM btree_or_rtree  { Lex->key_create_info.algorithm= $2; }
+        ;
+
 key_opt:
-	USING opt_btree_or_rtree       { Lex->key_create_info.algorithm= $2; }
-	| TYPE_SYM opt_btree_or_rtree  { Lex->key_create_info.algorithm= $2; }
+        key_using_alg
 	| KEY_BLOCK_SIZE opt_equal ulong_num
 	  { Lex->key_create_info.block_size= $3; }
 	| WITH PARSER_SYM IDENT_sys
@@ -4559,7 +4563,7 @@ key_opt:
         ;
 
 
-opt_btree_or_rtree:
+btree_or_rtree:
 	BTREE_SYM	{ $$= HA_KEY_ALG_BTREE; }
 	| RTREE_SYM
 	  {
@@ -4573,7 +4577,7 @@ key_list:
 
 key_part:
 	ident			{ $$=new key_part_spec($1.str); }
-	| ident '(' NUM ')'	
+	| ident '(' NUM ')'
         {
           int key_part_len= atoi($3.str);
           if (!key_part_len)