Add lint against Iterator::map receiving a callable that returns ()

library/core/src/iter/mod.rs

@@ -278,6 +278,7 @@
 //!
 //! ```
 //! # #![allow(unused_must_use)]
+//! # #![cfg_attr(not(bootstrap), allow(map_unit_fn))]
 //! let v = vec![1, 2, 3, 4, 5];
 //! v.iter().map(|x| println!("{x}"));
 //! ```

library/core/src/iter/traits/iterator.rs

@@ -777,6 +777,7 @@ pub trait Iterator {
     ///     println!("{x}");
     /// }
     /// ```
+    #[rustc_diagnostic_item = "IteratorMap"]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn map<B, F>(self, f: F) -> Map<Self, F>