Ticket #18263: tax-doin-wrong-2.patch

wp-includes/taxonomy.php

@@ -311 +311 @@
                                         );
         $args = wp_parse_args($args, $defaults);
 
+        if ( false === $args['_builtin'] && ! empty( $wp ) ) {
+                global $reserved;
+                if ( empty( $reserved ) )
+                        $reserved = array_merge( $wp->public_query_vars, $wp->private_query_vars );
+                if ( in_array( $taxonomy, $reserved ) )
+                        _doing_it_wrong( __FUNCTION__, __( 'You should not use a reserved term when registering a taxonomy.' ), '3.3' );
+        }
+        
         if ( false !== $args['query_var'] && !empty($wp) ) {
                 if ( true === $args['query_var'] )
                         $args['query_var'] = $taxonomy;