+ /// **What it does:** Checks for imports that remove "unsafe" from an item's
+ /// name.
+ ///
+ /// **Why is this bad?** Renaming makes it less clear which traits and
+ /// structures are unsafe.
+ ///
+ /// **Known problems:** None.
+ ///
+ /// **Example:**
+ /// ```rust,ignore
+ /// use std::cell::{UnsafeCell as TotallySafeCell};
+ ///
+ /// extern crate crossbeam;
+ /// use crossbeam::{spawn_unsafe as spawn};
+ /// ```