renamed enum Item_cast as it's not a 'class Item' child

sql/item_create.cc

@@ -470,7 +470,7 @@ Item *create_load_file(Item* a)
 }
 
 
-Item *create_func_cast(Item *a, Item_cast cast_type, CHARSET_INFO *cs)
+Item *create_func_cast(Item *a, Cast_target cast_type, CHARSET_INFO *cs)
 {
   Item *res;
   LINT_INIT(res);

sql/item_create.h

@@ -28,7 +28,7 @@ Item *create_func_bit_length(Item* a);
 Item *create_func_coercibility(Item* a);
 Item *create_func_ceiling(Item* a);
 Item *create_func_char_length(Item* a);
-Item *create_func_cast(Item *a, Item_cast cast_type, CHARSET_INFO *cs);
+Item *create_func_cast(Item *a, Cast_target cast_type, CHARSET_INFO *cs);
 Item *create_func_connection_id(void);
 Item *create_func_conv(Item* a, Item *b, Item *c);
 Item *create_func_cos(Item* a);

sql/item_func.h

@@ -1081,7 +1081,7 @@ class Item_func_is_used_lock :public Item_int_func
 
 /* For type casts */
 
-enum Item_cast
+enum Cast_target
 {
   ITEM_CAST_BINARY, ITEM_CAST_SIGNED_INT, ITEM_CAST_UNSIGNED_INT,
   ITEM_CAST_DATE, ITEM_CAST_TIME, ITEM_CAST_DATETIME, ITEM_CAST_CHAR

sql/sql_yacc.yy

@@ -74,7 +74,7 @@ inline Item *or_or_concat(THD *thd, Item* A, Item* B)
   enum row_type row_type;
   enum ha_rkey_function ha_rkey_mode;
   enum enum_tx_isolation tx_isolation;
-  enum Item_cast cast_type;
+  enum Cast_target cast_type;
   enum Item_udftype udf_type;
   CHARSET_INFO *charset;
   thr_lock_type lock_type;