Auto merge of #48322 - GuillaumeGomez:rollup, r=GuillaumeGomez

Rollup of 6 pull requests

- Successful merges: #48194, #48273, #48274, #48275, #48282, #48312
- Failed merges:

2 files changed, 3 insertions, 0 deletions

diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
-Subproject 919980be7df4ea7d45a9dca8efc34da89bcf7d6
+Subproject ebb28c95b2ea68b96eddb9e71aff4d32eacc74f
diff --git a/src/doc/unstable-book/src/language-features/macro-at-most-once-rep.md b/src/doc/unstable-book/src/language-features/macro-at-most-once-rep.md
index dbaf91b6e78..ec9d85db107 100644
--- a/src/doc/unstable-book/src/language-features/macro-at-most-once-rep.md
+++ b/src/doc/unstable-book/src/language-features/macro-at-most-once-rep.md
@@ -6,7 +6,10 @@ With this feature gate enabled, one can use `?` as a Kleene operator meaning "0
 or 1 repetitions" in a macro definition. Previously only `+` and `*` were allowed.
 
 For example:
+
 ```rust
+#![feature(macro_at_most_once_rep)]
+
 macro_rules! foo {
     (something $(,)?) // `?` indicates `,` is "optional"...
         => {}