Another cargo dev fmt

Author: Ype Kingma

clippy_lints/src/lifetimes_bound_nested_ref.rs

@@ -11,10 +11,6 @@ use rustc_span::symbol::Ident;
 use rustc_span::{Span, Symbol};
 use std::collections::BTreeMap;
 use std::collections::btree_map::Entry;
-
-extern crate rustc_hash;
-use rustc_hash::FxHashMap;
-
 /// Lints to help dealing with unsoundness due to a compiler bug described here:
 /// <https://github.com/rust-lang/rustc-dev-guide/blob/478a77a902f64e5128e7164e4e8a3980cfe4b133/src/traits/implied-bounds.md>.
 ///
@@ -36,6 +32,8 @@ use rustc_hash::FxHashMap;
 /// There is also a reverse lint that suggests to remove lifetime bounds
 /// that are implied by nested references. This reverse lint is intended to be used only
 /// when the compiler has been fixed to handle these lifetime bounds correctly.
+extern crate rustc_hash;
+use rustc_hash::FxHashMap;
 
 declare_clippy_lint! {
     /// ### What it does