diff --git a/src/librustc/middle/cfg/mod.rs b/src/librustc/middle/cfg/mod.rs
index 9c2dcd74351e..97ea996bb7e4 100644
--- a/src/librustc/middle/cfg/mod.rs
+++ b/src/librustc/middle/cfg/mod.rs
@@ -15,6 +15,8 @@
 
 */
 
+#![allow(dead_code)] // still a WIP, #6298
+
 use middle::graph;
 use middle::ty;
 use middle::typeck;