remove all references to private from outside the macro

src/librustc/dep_graph/graph.rs

@@ -44,7 +44,9 @@ newtype_index! {
 }
 
 impl DepNodeIndex {
-    const INVALID: DepNodeIndex = DepNodeIndex { private: ::std::u32::MAX };
+    const INVALID: DepNodeIndex = unsafe {
+        DepNodeIndex::from_u32_unchecked(::std::u32::MAX)
+    };
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
@@ -1127,14 +1129,16 @@ impl DepNodeColorMap {
         match self.values[index] {
             COMPRESSED_NONE => None,
             COMPRESSED_RED => Some(DepNodeColor::Red),
-            value => Some(DepNodeColor::Green(DepNodeIndex { private: value - COMPRESSED_FIRST_GREEN })),
+            value => Some(DepNodeColor::Green(DepNodeIndex::from_u32(
+                value - COMPRESSED_FIRST_GREEN
+            )))
         }
     }
 
     fn insert(&mut self, index: SerializedDepNodeIndex, color: DepNodeColor) {
         self.values[index] = match color {
             DepNodeColor::Red => COMPRESSED_RED,
-            DepNodeColor::Green(index) => index.private + COMPRESSED_FIRST_GREEN,
+            DepNodeColor::Green(index) => index.as_u32() + COMPRESSED_FIRST_GREEN,
         }
     }
 }

src/librustc/hir/def_id.rs

@@ -41,19 +41,7 @@ newtype_index! {
 impl CrateNum {
     pub fn new(x: usize) -> CrateNum {
         assert!(x < (u32::MAX as usize));
-        CrateNum { private: x as u32 }
-    }
-
-    pub fn from_u32(x: u32) -> CrateNum {
-        CrateNum { private: x }
-    }
-
-    pub fn as_usize(&self) -> usize {
-        self.private as usize
-    }
-
-    pub fn as_u32(&self) -> u32 {
-        u32::from(*self)
+        CrateNum::from_u32(x as u32)
     }
 
     pub fn as_def_id(&self) -> DefId { DefId { krate: *self, index: CRATE_DEF_INDEX } }
@@ -61,7 +49,7 @@ impl CrateNum {
 
 impl fmt::Display for CrateNum {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        fmt::Display::fmt(&self.private, f)
+        fmt::Display::fmt(&self.as_u32(), f)
     }
 }
 

src/librustc/mir/mod.rs

@@ -131,9 +131,6 @@ pub struct Mir<'tcx> {
     cache: cache::Cache,
 }
 
-/// where execution begins
-pub const START_BLOCK: BasicBlock = BasicBlock { private: 0 };
-
 impl<'tcx> Mir<'tcx> {
     pub fn new(
         basic_blocks: IndexVec<BasicBlock, BasicBlockData<'tcx>>,
@@ -239,7 +236,7 @@ impl<'tcx> Mir<'tcx> {
 
     #[inline]
     pub fn local_kind(&self, local: Local) -> LocalKind {
-        let index = local.private as usize;
+        let index = local.as_usize();
         if index == 0 {
             debug_assert!(
                 self.local_decls[local].mutability == Mutability::Mut,
@@ -855,7 +852,8 @@ pub struct UpvarDecl {
 
 newtype_index! {
     pub struct BasicBlock {
-        DEBUG_FORMAT = "bb{}"
+        DEBUG_FORMAT = "bb{}",
+        const START_BLOCK = 0,
     }
 }
 

src/librustc/ty/sty.rs

@@ -1274,7 +1274,9 @@ impl DebruijnIndex {
     /// you would need to shift the index for `'a` into 1 new binder.
     #[must_use]
     pub const fn shifted_in(self, amount: u32) -> DebruijnIndex {
-        DebruijnIndex { private: self.private + amount }
+        unsafe {
+            DebruijnIndex::from_u32_unchecked(self.as_u32() + amount)
+        }
     }
 
     /// Update this index in place by shifting it "in" through
@@ -1287,7 +1289,9 @@ impl DebruijnIndex {
     /// `amount` number of new binders.
     #[must_use]
     pub const fn shifted_out(self, amount: u32) -> DebruijnIndex {
-        DebruijnIndex { private: self.private - amount }
+        unsafe {
+            DebruijnIndex::from_u32_unchecked(self.as_u32() - amount)
+        }
     }
 
     /// Update in place by shifting out from `amount` binders.
@@ -1316,7 +1320,7 @@ impl DebruijnIndex {
     /// bound by one of the binders we are shifting out of, that is an
     /// error (and should fail an assertion failure).
     pub fn shifted_out_to_binder(self, to_binder: DebruijnIndex) -> Self {
-        self.shifted_out((to_binder.private - INNERMOST.private) as u32)
+        self.shifted_out(to_binder.as_u32() - INNERMOST.as_u32())
     }
 }
 

src/librustc_data_structures/indexed_vec.rs

@@ -102,23 +102,55 @@ macro_rules! newtype_index {
         }
 
         impl $type {
+            #[inline]
+            $v fn from_usize(value: usize) -> Self {
+                assert!(value < ($max as usize));
+                unsafe {
+                    $type::from_u32_unchecked(value as u32)
+                }
+            }
+
+            #[inline]
+            $v fn from_u32(value: u32) -> Self {
+                assert!(value < $max);
+                unsafe {
+                    $type::from_u32_unchecked(value)
+                }
+            }
+
+            #[inline]
+            $v const unsafe fn from_u32_unchecked(value: u32) -> Self {
+                $type { private: value }
+            }
+
             /// Extract value of this index as an integer.
             #[inline]
             $v fn index(self) -> usize {
-                <Self as Idx>::index(self)
+                self.as_usize()
+            }
+
+            /// Extract value of this index as a usize.
+            #[inline]
+            $v const fn as_u32(self) -> u32 {
+                self.private
+            }
+
+            /// Extract value of this index as a u32.
+            #[inline]
+            $v const fn as_usize(self) -> usize {
+                self.private as usize
             }
         }
 
         impl Idx for $type {
             #[inline]
             fn new(value: usize) -> Self {
-                assert!(value < ($max) as usize);
-                $type { private: value as u32 }
+                Self::from(value)
             }
 
             #[inline]
             fn index(self) -> usize {
-                self.private as usize
+                usize::from(self)
             }
         }
 
@@ -153,25 +185,25 @@ macro_rules! newtype_index {
 
         impl From<$type> for u32 {
             fn from(v: $type) -> u32 {
-                v.private
+                v.as_u32()
             }
         }
 
         impl From<$type> for usize {
             fn from(v: $type) -> usize {
-                v.private as usize
+                v.as_usize()
             }
         }
 
         impl From<usize> for $type {
-            fn from(v: usize) -> Self {
-                Self::new(v)
+            fn from(value: usize) -> Self {
+                $type::from_usize(value)
             }
         }
 
         impl From<u32> for $type {
-            fn from(v: u32) -> Self {
-                Self::new(v as usize)
+            fn from(value: u32) -> Self {
+                $type::from_u32(value)
             }
         }
 
@@ -195,7 +227,7 @@ macro_rules! newtype_index {
      @debug_format [$debug_format:tt]) => (
         impl ::std::fmt::Debug for $type {
             fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-                write!(fmt, $debug_format, self.private)
+                write!(fmt, $debug_format, self.as_u32())
             }
         }
     );
@@ -378,7 +410,7 @@ macro_rules! newtype_index {
                    const $name:ident = $constant:expr,
                    $($tokens:tt)*) => (
         $(#[doc = $doc])*
-        pub const $name: $type = $type { private: $constant  };
+        pub const $name: $type = unsafe { $type::from_u32_unchecked($constant) };
         newtype_index!(
             @derives      [$($derives,)*]
             @type         [$type]