Make the fields of RangeInclusive private.

Added new()/start()/end() methods to RangeInclusive.

Changed the lowering of `..=` to use RangeInclusive::new().

src/libcore/ops/range.rs

@@ -320,7 +320,7 @@ impl<Idx: PartialOrd<Idx>> RangeTo<Idx> {
 /// ```
 /// #![feature(inclusive_range_fields)]
 ///
-/// assert_eq!((3..=5), std::ops::RangeInclusive { start: 3, end: 5 });
+/// assert_eq!((3..=5), std::ops::RangeInclusive::new(3, 5));
 /// assert_eq!(3 + 4 + 5, (3..=5).sum());
 ///
 /// let arr = [0, 1, 2, 3];
@@ -331,14 +331,72 @@ impl<Idx: PartialOrd<Idx>> RangeTo<Idx> {
 #[derive(Clone, PartialEq, Eq, Hash)]  // not Copy -- see #27186
 #[stable(feature = "inclusive_range", since = "1.26.0")]
 pub struct RangeInclusive<Idx> {
+    // FIXME: The current representation follows RFC 1980,
+    // but it is known that LLVM is not able to optimize loops following that RFC.
+    // Consider adding an extra `bool` field to indicate emptiness of the range.
+    // See #45222 for performance test cases.
+    #[cfg(not(stage0))]
+    pub(crate) start: Idx,
+    #[cfg(not(stage0))]
+    pub(crate) end: Idx,
     /// The lower bound of the range (inclusive).
+    #[cfg(stage0)]
     #[unstable(feature = "inclusive_range_fields", issue = "49022")]
     pub start: Idx,
     /// The upper bound of the range (inclusive).
+    #[cfg(stage0)]
     #[unstable(feature = "inclusive_range_fields", issue = "49022")]
     pub end: Idx,
 }
 
+impl<Idx> RangeInclusive<Idx> {
+    /// Creates a new inclusive range. Equivalent to writing `start..=end`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(inclusive_range_methods)]
+    /// use std::ops::RangeInclusive;
+    ///
+    /// assert_eq!(3..=5, RangeInclusive::new(3, 5));
+    /// ```
+    #[unstable(feature = "inclusive_range_methods", issue = "49022")]
+    #[inline]
+    pub fn new(start: Idx, end: Idx) -> Self {
+        Self { start, end }
+    }
+
+    /// Returns the lower bound of the range (inclusive).
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(inclusive_range_methods)]
+    ///
+    /// assert_eq!((3..=5).start(), &3);
+    /// ```
+    #[unstable(feature = "inclusive_range_methods", issue = "49022")]
+    #[inline]
+    pub fn start(&self) -> &Idx {
+        &self.start
+    }
+
+    /// Returns the upper bound of the range (inclusive).
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(inclusive_range_methods)]
+    ///
+    /// assert_eq!((3..=5).end(), &5);
+    /// ```
+    #[unstable(feature = "inclusive_range_methods", issue = "49022")]
+    #[inline]
+    pub fn end(&self) -> &Idx {
+        &self.end
+    }
+}
+
 #[stable(feature = "inclusive_range", since = "1.26.0")]
 impl<Idx: fmt::Debug> fmt::Debug for RangeInclusive<Idx> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {