Auto merge of #60877 - Centril:rollup-j0o5mo5, r=Centril

Rollup of 6 pull requests

Successful merges:

 - #59825 (string: implement From<&String> for String)
 - #59923 (Fix convert module's documentation links)
 - #60691 (Include expression to wait for to the span of Await)
 - #60769 (Update rustc book CLI docs.)
 - #60816 (README.md: Mention MSVC 2017+, not 2013(!))
 - #60851 (Move `box` from the stable keyword to unstable keywords list)

Failed merges:

r? @ghost

1 files changed, 8 insertions, 0 deletions

diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index 63f7769fee5..e74d37c1c2b 100644
--- a/src/liballoc/string.rs
+++ b/src/liballoc/string.rs
@@ -2189,6 +2189,14 @@ impl From<&str> for String {
     }
 }
 
+#[stable(feature = "from_ref_string", since = "1.35.0")]
+impl From<&String> for String {
+    #[inline]
+    fn from(s: &String) -> String {
+        s.clone()
+    }
+}
+
 // note: test pulls in libstd, which causes errors here
 #[cfg(not(test))]
 #[stable(feature = "string_from_box", since = "1.18.0")]