Index: wp-includes/wp-db.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-includes/wp-db.php	(revision 25715)
+++ wp-includes/wp-db.php	(revision )
@@ -992,7 +992,9 @@
 	function prepare( $query, $args ) {
 		if ( is_null( $query ) )
 			return;
-
+		if ( strpos( $query, '%' ) === false ) {
+			_doing_it_wrong( 'wpdb::prepare', __( 'First argument of wpdb::prepare() should have a placeholder.' ), '3.9' );
+		}
 		$args = func_get_args();
 		array_shift( $args );
 		// If args were passed as an array (as in vsprintf), move them up