1 files changed, 22 insertions, 5 deletions
diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
index be41919b9..59e3f887b 100644
--- a/library/alloc/src/string.rs
+++ b/library/alloc/src/string.rs
@@ -1851,7 +1851,7 @@ impl String {
     }
 
     /// Consumes and leaks the `String`, returning a mutable reference to the contents,
-    /// `&'static mut str`.
+    /// `&'a mut str`.
     ///
     /// This is mainly useful for data that lives for the remainder of
     /// the program's life. Dropping the returned reference will cause a memory
@@ -1874,7 +1874,7 @@ impl String {
     /// ```
     #[unstable(feature = "string_leak", issue = "102929")]
     #[inline]
-    pub fn leak(self) -> &'static mut str {
+    pub fn leak<'a>(self) -> &'a mut str {
         let slice = self.vec.leak();
         unsafe { from_utf8_unchecked_mut(slice) }
     }
@@ -2247,8 +2247,7 @@ impl_eq! { Cow<'a, str>, &'b str }
 impl_eq! { Cow<'a, str>, String }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
-impl const Default for String {
+impl Default for String {
     /// Creates an empty `String`.
     #[inline]
     fn default() -> String {
@@ -2528,6 +2527,15 @@ impl<T: fmt::Display + ?Sized> ToString for T {
 }
 
 #[cfg(not(no_global_oom_handling))]
+#[unstable(feature = "ascii_char", issue = "110998")]
+impl ToString for core::ascii::Char {
+    #[inline]
+    fn to_string(&self) -> String {
+        self.as_str().to_owned()
+    }
+}
+
+#[cfg(not(no_global_oom_handling))]
 #[stable(feature = "char_to_string_specialization", since = "1.46.0")]
 impl ToString for char {
     #[inline]
@@ -2615,6 +2623,15 @@ impl ToString for String {
     }
 }
 
+#[cfg(not(no_global_oom_handling))]
+#[stable(feature = "fmt_arguments_to_string_specialization", since = "1.71.0")]
+impl ToString for fmt::Arguments<'_> {
+    #[inline]
+    fn to_string(&self) -> String {
+        crate::fmt::format(*self)
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl AsRef<str> for String {
     #[inline]
@@ -2733,7 +2750,7 @@ impl<'a> From<Cow<'a, str>> for String {
     /// ```
     /// # use std::borrow::Cow;
     /// // If the string is not owned...
-    /// let cow: Cow<str> = Cow::Borrowed("eggplant");
+    /// let cow: Cow<'_, str> = Cow::Borrowed("eggplant");
     /// // It will allocate on the heap and copy the string.
     /// let owned: String = String::from(cow);
     /// assert_eq!(&owned[..], "eggplant");