add `str::SplitInclusive::as_str` method

This commit entroduces `core::str::SplitInclusive::as_str` method similar to
`core::str::Split::as_str`, but under different gate -
"str_split_inclusive_as_str" (this is done so because `SplitInclusive` is
itself unstable).

library/core/src/lib.rs

@@ -126,6 +126,7 @@
 #![feature(std_internals)]
 #![feature(stmt_expr_attributes)]
 #![feature(str_split_as_str)]
+#![feature(str_split_inclusive_as_str)]
 #![feature(transparent_unions)]
 #![feature(unboxed_closures)]
 #![feature(unsized_locals)]

library/core/src/str/iter.rs

@@ -699,9 +699,7 @@ impl<'a, P: Pattern<'a>> SplitInternal<'a, P> {
         }
 
         // SAFETY: `self.start` and `self.end` always lie on unicode boundaries.
-        unsafe {
-            self.matcher.haystack().get_unchecked(self.start..self.end)
-        }
+        unsafe { self.matcher.haystack().get_unchecked(self.start..self.end) }
     }
 }
 
@@ -1278,6 +1276,28 @@ impl<'a, P: Pattern<'a, Searcher: ReverseSearcher<'a>>> DoubleEndedIterator
 #[unstable(feature = "split_inclusive", issue = "72360")]
 impl<'a, P: Pattern<'a>> FusedIterator for SplitInclusive<'a, P> {}
 
+impl<'a, P: Pattern<'a>> SplitInclusive<'a, P> {
+    /// Returns remainder of the splitted string
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(str_split_inclusive_as_str)]
+    /// #![feature(split_inclusive)]
+    /// let mut split = "Mary had a little lamb".split_inclusive(' ');
+    /// assert_eq!(split.as_str(), "Mary had a little lamb");
+    /// split.next();
+    /// assert_eq!(split.as_str(), "had a little lamb");
+    /// split.by_ref().for_each(drop);
+    /// assert_eq!(split.as_str(), "");
+    /// ```
+    #[inline]
+    #[unstable(feature = "str_split_inclusive_as_str", issue = "none")]
+    pub fn as_str(&self) -> &'a str {
+        self.0.as_str()
+    }
+}
+
 /// An iterator of [`u16`] over the string encoded as UTF-16.
 ///
 /// This struct is created by the [`encode_utf16`] method on [`str`].