Auto merge of #98307 - matthiaskrgr:rollup-rb3huha, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - #98235 (Drop magic value 3 from code)
 - #98267 (Don't omit comma when suggesting wildcard arm after macro expr)
 - #98276 (Mention formatting macros when encountering `ArgumentV1` method in const)
 - #98296 (Add a link to the unstable book page on Generator doc comment)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

core/src/fmt/mod.rs

@@ -320,6 +320,7 @@ macro_rules! arg_new {
     };
 }
 
+#[rustc_diagnostic_item = "ArgumentV1Methods"]
 impl<'a> ArgumentV1<'a> {
     #[doc(hidden)]
     #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")]

core/src/ops/generator.rs

@@ -61,9 +61,10 @@ pub enum GeneratorState<Y, R> {
 /// }
 /// ```
 ///
-/// More documentation of generators can be found in the unstable book.
+/// More documentation of generators can be found in the [unstable book].
 ///
 /// [RFC 2033]: https://github.com/rust-lang/rfcs/pull/2033
+/// [unstable book]: ../../unstable-book/language-features/generators.html
 #[lang = "generator"]
 #[unstable(feature = "generator_trait", issue = "43122")]
 #[fundamental]