diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 19d3ad2024713..5ae984a4b155b 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -192,7 +192,7 @@ mod wrapping;
 macro_rules! int_impl {
     ($SelfT:ty, $ActualT:ident, $UnsignedT:ty, $BITS:expr, $Min:expr, $Max:expr, $Feature:expr,
      $EndFeature:expr, $rot:expr, $rot_op:expr, $rot_result:expr, $swap_op:expr, $swapped:expr,
-     $reversed:expr) => {
+     $reversed:expr, $le_bytes:expr, $be_bytes:expr) => {
         doc_comment! {
             concat!("Returns the smallest value that can be represented by this integer type.
 
@@ -2063,23 +2063,25 @@ $EndFeature, "
             self.to_be().to_ne_bytes()
         }
 
-        /// Return the memory representation of this integer as a byte array in
-        /// big-endian (network) byte order.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let bytes = 0x12_34_56_78_i32.to_be_bytes();
-        /// assert_eq!(bytes, [0x12, 0x34, 0x56, 0x78]);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn to_be_bytes(self) -> [u8; mem::size_of::<Self>()] {
-            self.to_be().to_ne_bytes()
+        doc_comment! {
+            concat!("Return the memory representation of this integer as a byte array in
+big-endian (network) byte order.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let bytes = ", $swap_op, stringify!($SelfT), ".to_be_bytes();
+assert_eq!(bytes, ", $be_bytes, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn to_be_bytes(self) -> [u8; mem::size_of::<Self>()] {
+                self.to_be().to_ne_bytes()
+            }
         }
 
         /// no docs here
@@ -2090,23 +2092,25 @@ $EndFeature, "
             self.to_le().to_ne_bytes()
         }
 
-        /// Return the memory representation of this integer as a byte array in
-        /// little-endian byte order.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let bytes =  0x12_34_56_78_i32.to_le_bytes();
-        /// assert_eq!(bytes, [0x78, 0x56, 0x34, 0x12]);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn to_le_bytes(self) -> [u8; mem::size_of::<Self>()] {
-            self.to_le().to_ne_bytes()
+doc_comment! {
+            concat!("Return the memory representation of this integer as a byte array in
+little-endian byte order.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let bytes = ", $swap_op, stringify!($SelfT), ".to_le_bytes();
+assert_eq!(bytes, ", $le_bytes, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn to_le_bytes(self) -> [u8; mem::size_of::<Self>()] {
+                self.to_le().to_ne_bytes()
+            }
         }
 
         /// no docs here
@@ -2117,30 +2121,37 @@ $EndFeature, "
             unsafe { mem::transmute(self) }
         }
 
-        /// Return the memory representation of this integer as a byte array in
-        /// native byte order.
-        ///
-        /// As the target platform's native endianness is used, portable code
-        /// should use [`to_be_bytes`] or [`to_le_bytes`], as appropriate,
-        /// instead.
-        ///
-        /// [`to_be_bytes`]: #method.to_be_bytes
-        /// [`to_le_bytes`]: #method.to_le_bytes
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let bytes = i32::min_value().to_be().to_ne_bytes();
-        /// assert_eq!(bytes, [0x80, 0, 0, 0]);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()] {
-            unsafe { mem::transmute(self) }
+        doc_comment! {
+            concat!("
+Return the memory representation of this integer as a byte array in
+native byte order.
+
+As the target platform's native endianness is used, portable code
+should use [`to_be_bytes`] or [`to_le_bytes`], as appropriate,
+instead.
+
+[`to_be_bytes`]: #method.to_be_bytes
+[`to_le_bytes`]: #method.to_le_bytes
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let bytes = ", $swap_op, stringify!($SelfT), ".to_ne_bytes();
+assert_eq!(bytes, if cfg!(target_endian = \"big\") {
+        ", $be_bytes, "
+    } else {
+        ", $le_bytes, "
+    });
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()] {
+                unsafe { mem::transmute(self) }
+            }
         }
 
         /// no docs here
@@ -2151,23 +2162,25 @@ $EndFeature, "
             Self::from_be(Self::from_ne_bytes(bytes))
         }
 
-        /// Create an integer value from its representation as a byte array in
-        /// big endian.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let int = i32::from_be_bytes([0x12, 0x34, 0x56, 0x78]);
-        /// assert_eq!(int, 0x12_34_56_78);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn from_be_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
-            Self::from_be(Self::from_ne_bytes(bytes))
+doc_comment! {
+            concat!("Create an integer value from its representation as a byte array in
+big endian.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let value = ", stringify!($SelfT), "::from_be_bytes(", $be_bytes, ");
+assert_eq!(value, ", $swap_op, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn from_be_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
+                Self::from_be(Self::from_ne_bytes(bytes))
+            }
         }
 
         /// no docs here
@@ -2178,23 +2191,26 @@ $EndFeature, "
             Self::from_le(Self::from_ne_bytes(bytes))
         }
 
-        /// Create an integer value from its representation as a byte array in
-        /// little endian.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let int = i32::from_le_bytes([0x12, 0x34, 0x56, 0x78]);
-        /// assert_eq!(int, 0x78_56_34_12);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn from_le_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
-            Self::from_le(Self::from_ne_bytes(bytes))
+doc_comment! {
+            concat!("
+Create an integer value from its representation as a byte array in
+little endian.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let value = ", stringify!($SelfT), "::from_le_bytes(", $le_bytes, ");
+assert_eq!(value, ", $swap_op, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn from_le_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
+                Self::from_le(Self::from_ne_bytes(bytes))
+            }
         }
 
         /// no docs here
@@ -2205,56 +2221,65 @@ $EndFeature, "
             unsafe { mem::transmute(bytes) }
         }
 
-        /// Create an integer value from its memory representation as a byte
-        /// array in native endianness.
-        ///
-        /// As the target platform's native endianness is used, portable code
-        /// likely wants to use [`from_be_bytes`] or [`from_le_bytes`], as
-        /// appropriate instead.
-        ///
-        /// [`from_be_bytes`]: #method.from_be_bytes
-        /// [`from_le_bytes`]: #method.from_le_bytes
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let int = i32::from_be(i32::from_ne_bytes([0x80, 0, 0, 0]));
-        /// assert_eq!(int, i32::min_value());
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
-            unsafe { mem::transmute(bytes) }
+        doc_comment! {
+            concat!("Create an integer value from its memory representation as a byte
+array in native endianness.
+
+As the target platform's native endianness is used, portable code
+likely wants to use [`from_be_bytes`] or [`from_le_bytes`], as
+appropriate instead.
+
+[`from_be_bytes`]: #method.from_be_bytes
+[`from_le_bytes`]: #method.from_le_bytes
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let value = ", stringify!($SelfT), "::from_ne_bytes(if cfg!(target_endian = \"big\") {
+        ", $be_bytes, "
+    } else {
+        ", $le_bytes, "
+    });
+assert_eq!(value, ", $swap_op, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
+                unsafe { mem::transmute(bytes) }
+            }
         }
     }
 }
 
 #[lang = "i8"]
 impl i8 {
-    int_impl! { i8, i8, u8, 8, -128, 127, "", "", 2, "-0x7e", "0xa", "0x12", "0x12", "0x48" }
+    int_impl! { i8, i8, u8, 8, -128, 127, "", "", 2, "-0x7e", "0xa", "0x12", "0x12", "0x48",
+        "[0x12]", "[0x12]" }
 }
 
 #[lang = "i16"]
 impl i16 {
     int_impl! { i16, i16, u16, 16, -32768, 32767, "", "", 4, "-0x5ffd", "0x3a", "0x1234", "0x3412",
-        "0x2c48" }
+        "0x2c48", "[0x34, 0x12]", "[0x12, 0x34]" }
 }
 
 #[lang = "i32"]
 impl i32 {
     int_impl! { i32, i32, u32, 32, -2147483648, 2147483647, "", "", 8, "0x10000b3", "0xb301",
-        "0x12345678", "0x78563412", "0x1e6a2c48" }
+        "0x12345678", "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]",
+        "[0x12, 0x34, 0x56, 0x78]" }
 }
 
 #[lang = "i64"]
 impl i64 {
     int_impl! { i64, i64, u64, 64, -9223372036854775808, 9223372036854775807, "", "", 12,
          "0xaa00000000006e1", "0x6e10aa", "0x1234567890123456", "0x5634129078563412",
-         "0x6a2c48091e6a2c48" }
+         "0x6a2c48091e6a2c48", "[0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]",
+         "[0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]" }
 }
 
 #[lang = "i128"]
@@ -2262,22 +2287,26 @@ impl i128 {
     int_impl! { i128, i128, u128, 128, -170141183460469231731687303715884105728,
         170141183460469231731687303715884105727, "", "", 16,
         "0x13f40000000000000000000000004f76", "0x4f7613f4", "0x12345678901234567890123456789012",
-        "0x12907856341290785634129078563412", "0x48091e6a2c48091e6a2c48091e6a2c48"
-    }
+        "0x12907856341290785634129078563412", "0x48091e6a2c48091e6a2c48091e6a2c48",
+        "[0x12, 0x90, 0x78, 0x56, 0x34, 0x12, 0x90, 0x78, \
+          0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]",
+        "[0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56, \
+          0x78, 0x90, 0x12, 0x34, 0x56, 0x78, 0x90, 0x12]" }
 }
 
 #[cfg(target_pointer_width = "16")]
 #[lang = "isize"]
 impl isize {
     int_impl! { isize, i16, u16, 16, -32768, 32767, "", "", 4, "-0x5ffd", "0x3a", "0x1234",
-        "0x3412", "0x2c48" }
+        "0x3412", "0x2c48", "[0x34, 0x12]", "[0x12, 0x34]" }
 }
 
 #[cfg(target_pointer_width = "32")]
 #[lang = "isize"]
 impl isize {
     int_impl! { isize, i32, u32, 32, -2147483648, 2147483647, "", "", 8, "0x10000b3", "0xb301",
-        "0x12345678", "0x78563412", "0x1e6a2c48" }
+        "0x12345678", "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]",
+        "[0x12, 0x34, 0x56, 0x78]" }
 }
 
 #[cfg(target_pointer_width = "64")]
@@ -2285,7 +2314,8 @@ impl isize {
 impl isize {
     int_impl! { isize, i64, u64, 64, -9223372036854775808, 9223372036854775807, "", "",
         12, "0xaa00000000006e1", "0x6e10aa",  "0x1234567890123456", "0x5634129078563412",
-         "0x6a2c48091e6a2c48" }
+         "0x6a2c48091e6a2c48", "[0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]",
+         "[0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]" }
 }
 
 // Emits the correct `cttz` call, depending on the size of the type.
@@ -2305,7 +2335,7 @@ macro_rules! uint_cttz_call {
 macro_rules! uint_impl {
     ($SelfT:ty, $ActualT:ty, $BITS:expr, $MaxV:expr, $Feature:expr, $EndFeature:expr,
         $rot:expr, $rot_op:expr, $rot_result:expr, $swap_op:expr, $swapped:expr,
-        $reversed:expr ) => {
+        $reversed:expr, $le_bytes:expr, $be_bytes:expr) => {
         doc_comment! {
             concat!("Returns the smallest value that can be represented by this integer type.
 
@@ -3960,23 +3990,25 @@ $EndFeature, "
             self.to_be().to_ne_bytes()
         }
 
-        /// Return the memory representation of this integer as a byte array in
-        /// big-endian (network) byte order.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let bytes =  0x12_34_56_78_i32.to_be_bytes();
-        /// assert_eq!(bytes, [0x12, 0x34, 0x56, 0x78]);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn to_be_bytes(self) -> [u8; mem::size_of::<Self>()] {
-            self.to_be().to_ne_bytes()
+                doc_comment! {
+            concat!("Return the memory representation of this integer as a byte array in
+big-endian (network) byte order.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let bytes = ", $swap_op, stringify!($SelfT), ".to_be_bytes();
+assert_eq!(bytes, ", $be_bytes, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn to_be_bytes(self) -> [u8; mem::size_of::<Self>()] {
+                self.to_be().to_ne_bytes()
+            }
         }
 
         /// no docs here
@@ -3987,23 +4019,25 @@ $EndFeature, "
             self.to_le().to_ne_bytes()
         }
 
-        /// Return the memory representation of this integer as a byte array in
-        /// little-endian byte order.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let bytes =  0x12_34_56_78_i32.to_le_bytes();
-        /// assert_eq!(bytes, [0x78, 0x56, 0x34, 0x12]);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn to_le_bytes(self) -> [u8; mem::size_of::<Self>()] {
-            self.to_le().to_ne_bytes()
+        doc_comment! {
+            concat!("Return the memory representation of this integer as a byte array in
+little-endian byte order.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let bytes = ", $swap_op, stringify!($SelfT), ".to_le_bytes();
+assert_eq!(bytes, ", $le_bytes, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn to_le_bytes(self) -> [u8; mem::size_of::<Self>()] {
+                self.to_le().to_ne_bytes()
+            }
         }
 
         /// no docs here
@@ -4014,30 +4048,37 @@ $EndFeature, "
             unsafe { mem::transmute(self) }
         }
 
-        /// Return the memory representation of this integer as a byte array in
-        /// native byte order.
-        ///
-        /// As the target platform's native endianness is used, portable code
-        /// should use [`to_be_bytes`] or [`to_le_bytes`], as appropriate,
-        /// instead.
-        ///
-        /// [`to_be_bytes`]: #method.to_be_bytes
-        /// [`to_le_bytes`]: #method.to_le_bytes
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let bytes = i32::min_value().to_be().to_ne_bytes();
-        /// assert_eq!(bytes, [0x80, 0, 0, 0]);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()] {
-            unsafe { mem::transmute(self) }
+        doc_comment! {
+            concat!("
+Return the memory representation of this integer as a byte array in
+native byte order.
+
+As the target platform's native endianness is used, portable code
+should use [`to_be_bytes`] or [`to_le_bytes`], as appropriate,
+instead.
+
+[`to_be_bytes`]: #method.to_be_bytes
+[`to_le_bytes`]: #method.to_le_bytes
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let bytes = ", $swap_op, stringify!($SelfT), ".to_ne_bytes();
+assert_eq!(bytes, if cfg!(target_endian = \"big\") {
+        ", $be_bytes, "
+    } else {
+        ", $le_bytes, "
+    });
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()] {
+                unsafe { mem::transmute(self) }
+            }
         }
 
         /// no docs here
@@ -4048,23 +4089,25 @@ $EndFeature, "
             Self::from_be(Self::from_ne_bytes(bytes))
         }
 
-        /// Create an integer value from its representation as a byte array in
-        /// big endian.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let int = i32::from_be_bytes([0x12, 0x34, 0x56, 0x78]);
-        /// assert_eq!(int, 0x12_34_56_78);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn from_be_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
-            Self::from_be(Self::from_ne_bytes(bytes))
+        doc_comment! {
+            concat!("Create an integer value from its representation as a byte array in
+big endian.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let value = ", stringify!($SelfT), "::from_be_bytes(", $be_bytes, ");
+assert_eq!(value, ", $swap_op, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn from_be_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
+                Self::from_be(Self::from_ne_bytes(bytes))
+            }
         }
 
         /// no docs here
@@ -4075,23 +4118,26 @@ $EndFeature, "
             Self::from_le(Self::from_ne_bytes(bytes))
         }
 
-        /// Create an integer value from its representation as a byte array in
-        /// little endian.
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let int = i32::from_le_bytes([0x12, 0x34, 0x56, 0x78]);
-        /// assert_eq!(int, 0x78_56_34_12);
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn from_le_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
-            Self::from_le(Self::from_ne_bytes(bytes))
+        doc_comment! {
+            concat!("
+Create an integer value from its representation as a byte array in
+little endian.
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let value = ", stringify!($SelfT), "::from_le_bytes(", $le_bytes, ");
+assert_eq!(value, ", $swap_op, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn from_le_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
+                Self::from_le(Self::from_ne_bytes(bytes))
+            }
         }
 
         /// no docs here
@@ -4102,37 +4148,44 @@ $EndFeature, "
             unsafe { mem::transmute(bytes) }
         }
 
-        /// Create an integer value from its memory representation as a byte
-        /// array in native endianness.
-        ///
-        /// As the target platform's native endianness is used, portable code
-        /// likely wants to use [`from_be_bytes`] or [`from_le_bytes`], as
-        /// appropriate instead.
-        ///
-        /// [`from_be_bytes`]: #method.from_be_bytes
-        /// [`from_le_bytes`]: #method.from_le_bytes
-        ///
-        /// # Examples
-        ///
-        /// ```
-        /// #![feature(int_to_from_bytes)]
-        ///
-        /// let int = i32::from_be(i32::from_ne_bytes([0x80, 0, 0, 0]));
-        /// assert_eq!(int, i32::min_value());
-        /// ```
-        #[unstable(feature = "int_to_from_bytes", issue = "52963")]
-        #[rustc_const_unstable(feature = "const_int_conversion")]
-        #[inline]
-        #[cfg(not(stage0))]
-        pub const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
-            unsafe { mem::transmute(bytes) }
+        doc_comment! {
+            concat!("Create an integer value from its memory representation as a byte
+array in native endianness.
+
+As the target platform's native endianness is used, portable code
+likely wants to use [`from_be_bytes`] or [`from_le_bytes`], as
+appropriate instead.
+
+[`from_be_bytes`]: #method.from_be_bytes
+[`from_le_bytes`]: #method.from_le_bytes
+
+# Examples
+
+```
+#![feature(int_to_from_bytes)]
+
+let value = ", stringify!($SelfT), "::from_ne_bytes(if cfg!(target_endian = \"big\") {
+        ", $be_bytes, "
+    } else {
+        ", $le_bytes, "
+    });
+assert_eq!(value, ", $swap_op, ");
+```"),
+            #[unstable(feature = "int_to_from_bytes", issue = "52963")]
+            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[inline]
+            #[cfg(not(stage0))]
+            pub const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
+                unsafe { mem::transmute(bytes) }
+            }
         }
     }
 }
 
 #[lang = "u8"]
 impl u8 {
-    uint_impl! { u8, u8, 8, 255, "", "", 2, "0x82", "0xa", "0x12", "0x12", "0x48" }
+    uint_impl! { u8, u8, 8, 255, "", "", 2, "0x82", "0xa", "0x12", "0x12", "0x48", "[0x12]",
+        "[0x12]" }
 
 
     /// Checks if the value is within the ASCII range.
@@ -4658,45 +4711,55 @@ impl u8 {
 
 #[lang = "u16"]
 impl u16 {
-    uint_impl! { u16, u16, 16, 65535, "", "", 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48" }
+    uint_impl! { u16, u16, 16, 65535, "", "", 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48",
+        "[0x34, 0x12]", "[0x12, 0x34]" }
 }
 
 #[lang = "u32"]
 impl u32 {
     uint_impl! { u32, u32, 32, 4294967295, "", "", 8, "0x10000b3", "0xb301", "0x12345678",
-        "0x78563412", "0x1e6a2c48" }
+        "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]", "[0x12, 0x34, 0x56, 0x78]" }
 }
 
 #[lang = "u64"]
 impl u64 {
     uint_impl! { u64, u64, 64, 18446744073709551615, "", "", 12, "0xaa00000000006e1", "0x6e10aa",
-        "0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48" }
+        "0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48",
+        "[0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]",
+        "[0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]" }
 }
 
 #[lang = "u128"]
 impl u128 {
     uint_impl! { u128, u128, 128, 340282366920938463463374607431768211455, "", "", 16,
         "0x13f40000000000000000000000004f76", "0x4f7613f4", "0x12345678901234567890123456789012",
-        "0x12907856341290785634129078563412", "0x48091e6a2c48091e6a2c48091e6a2c48" }
+        "0x12907856341290785634129078563412", "0x48091e6a2c48091e6a2c48091e6a2c48",
+        "[0x12, 0x90, 0x78, 0x56, 0x34, 0x12, 0x90, 0x78, \
+          0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]",
+        "[0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56, \
+          0x78, 0x90, 0x12, 0x34, 0x56, 0x78, 0x90, 0x12]" }
 }
 
 #[cfg(target_pointer_width = "16")]
 #[lang = "usize"]
 impl usize {
-    uint_impl! { usize, u16, 16, 65536, "", "", 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48" }
+    uint_impl! { usize, u16, 16, 65536, "", "", 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48",
+        "[0x34, 0x12]", "[0x12, 0x34]" }
 }
 #[cfg(target_pointer_width = "32")]
 #[lang = "usize"]
 impl usize {
     uint_impl! { usize, u32, 32, 4294967295, "", "", 8, "0x10000b3", "0xb301", "0x12345678",
-        "0x78563412", "0x1e6a2c48" }
+        "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]", "[0x12, 0x34, 0x56, 0x78]" }
 }
 
 #[cfg(target_pointer_width = "64")]
 #[lang = "usize"]
 impl usize {
     uint_impl! { usize, u64, 64, 18446744073709551615, "", "", 12, "0xaa00000000006e1", "0x6e10aa",
-        "0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48" }
+        "0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48",
+        "[0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]",
+         "[0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]" }
 }
 
 /// A classification of floating point numbers.