diff --git a/src/librustc/dep_graph/graph.rs b/src/librustc/dep_graph/graph.rs
index 71a7ee84cd1..d9770db9d69 100644
--- a/src/librustc/dep_graph/graph.rs
+++ b/src/librustc/dep_graph/graph.rs
@@ -569,20 +569,6 @@ pub(super) struct DepNodeIndexNew {
 }
 
 impl Idx for DepNodeIndexNew {
-    fn new(idx: usize) -> Self {
-        DepNodeIndexNew::new(idx)
-    }
-    fn index(self) -> usize {
-        self.index()
-    }
-}
-
-impl DepNodeIndexNew {
-
-    const INVALID: DepNodeIndexNew = DepNodeIndexNew {
-        index: ::std::u32::MAX,
-    };
-
     fn new(v: usize) -> DepNodeIndexNew {
         assert!((v & 0xFFFF_FFFF) == v);
         DepNodeIndexNew { index: v as u32 }
@@ -593,6 +579,12 @@ impl DepNodeIndexNew {
     }
 }
 
+impl DepNodeIndexNew {
+    const INVALID: DepNodeIndexNew = DepNodeIndexNew {
+        index: ::std::u32::MAX,
+    };
+}
+
 #[derive(Clone, Debug, PartialEq)]
 enum OpenTask {
     Regular {