+ /// **What it does:** Checks for always-identical `Into`/`From`/`IntoIter` conversions.
+ ///
+ /// **Why is this bad?** Redundant code.
+ ///
+ /// **Known problems:** None.
+ ///
+ /// **Example:**
+ /// ```rust
+ /// // format!() returns a `String`
+ /// let s: String = format!("hello").into();
+ /// ```