diff --git a/src/librustc/hir/def_id.rs b/src/librustc/hir/def_id.rs
index 1dc668066d8b..cd91b85689b3 100644
--- a/src/librustc/hir/def_id.rs
+++ b/src/librustc/hir/def_id.rs
@@ -16,7 +16,7 @@ use std::fmt;
 use std::u32;
 
 newtype_index! {
-    pub struct CrateNum {
+    pub struct CrateId {
         ENCODABLE = custom
     }
 }
@@ -38,7 +38,7 @@ pub enum CrateNum {
 impl ::std::fmt::Debug for CrateNum {
     fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
         match self {
-            CrateNum::Index(id) => write!(fmt, "crate{}", id.0),
+            CrateNum::Index(id) => write!(fmt, "crate{}", id.private),
             CrateNum::Invalid => write!(fmt, "invalid crate"),
             CrateNum::BuiltinMacros => write!(fmt, "bultin macros crate"),
             CrateNum::ReservedForIncrCompCache => write!(fmt, "crate for decoding incr comp cache"),
@@ -48,7 +48,7 @@ impl ::std::fmt::Debug for CrateNum {
 
 /// Item definitions in the currently-compiled crate would have the CrateNum
 /// LOCAL_CRATE in their DefId.
-pub const LOCAL_CRATE: CrateNum = CrateNum::Index(CrateId(0));
+pub const LOCAL_CRATE: CrateNum = CrateNum::Index(CrateId::from_u32_const(0));
 
 
 impl Idx for CrateNum {
@@ -71,13 +71,35 @@ impl CrateNum {
         CrateNum::from_usize(x)
     }
 
+    pub fn from_usize(x: usize) -> CrateNum {
+        CrateNum::Index(CrateId::from_usize(x))
+    }
+
+    pub fn from_u32(x: u32) -> CrateNum {
+        CrateNum::Index(CrateId::from_u32(x))
+    }
+
+    pub fn as_usize(self) -> usize {
+        match self {
+            CrateNum::Index(id) => id.as_usize(),
+            _ => bug!("tried to get index of nonstandard crate {:?}", self),
+        }
+    }
+
+    pub fn as_u32(self) -> u32 {
+        match self {
+            CrateNum::Index(id) => id.as_u32(),
+            _ => bug!("tried to get index of nonstandard crate {:?}", self),
+        }
+    }
+
     pub fn as_def_id(&self) -> DefId { DefId { krate: *self, index: CRATE_DEF_INDEX } }
 }
 
 impl fmt::Display for CrateNum {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
-            CrateNum::Index(id) => fmt::Display::fmt(&id.0, f),
+            CrateNum::Index(id) => fmt::Display::fmt(&id.private, f),
             CrateNum::Invalid => write!(f, "invalid crate"),
             CrateNum::BuiltinMacros => write!(f, "bultin macros crate"),
             CrateNum::ReservedForIncrCompCache => write!(f, "crate for decoding incr comp cache"),
diff --git a/src/librustc/middle/region.rs b/src/librustc/middle/region.rs
index 6fa5d363ffa7..56960675b741 100644
--- a/src/librustc/middle/region.rs
+++ b/src/librustc/middle/region.rs
@@ -143,7 +143,7 @@ pub enum ScopeData {
 ///   and thus does not include EXPR_2, but covers the `...`.
 
 newtype_index! {
-    pub struct FirstStatementIndex;
+    pub struct FirstStatementIndex { .. }
 }
 
 impl_stable_hash_for!(struct ::middle::region::FirstStatementIndex { private });