Reformat use declarations.

The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.

compiler/rustc_mir_dataflow/src/move_paths/builder.rs

@@ -1,3 +1,5 @@
+use std::mem;
+
 use rustc_index::IndexVec;
 use rustc_middle::mir::tcx::{PlaceTy, RvalueInitializationState};
 use rustc_middle::mir::*;
@@ -6,12 +8,10 @@ use rustc_middle::{bug, span_bug};
 use smallvec::{smallvec, SmallVec};
 use tracing::debug;
 
-use std::mem;
-
 use super::abs_domain::Lift;
-use super::{Init, InitIndex, InitKind, InitLocation, LookupResult};
 use super::{
-    LocationMap, MoveData, MoveOut, MoveOutIndex, MovePath, MovePathIndex, MovePathLookup,
+    Init, InitIndex, InitKind, InitLocation, LocationMap, LookupResult, MoveData, MoveOut,
+    MoveOutIndex, MovePath, MovePathIndex, MovePathLookup,
 };
 
 struct MoveDataBuilder<'a, 'tcx, F> {

compiler/rustc_mir_dataflow/src/move_paths/mod.rs

@@ -1,4 +1,6 @@
-use crate::un_derefer::UnDerefer;
+use std::fmt;
+use std::ops::{Index, IndexMut};
+
 use rustc_data_structures::fx::FxHashMap;
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_middle::mir::*;
@@ -6,10 +8,8 @@ use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
 use rustc_span::Span;
 use smallvec::SmallVec;
 
-use std::fmt;
-use std::ops::{Index, IndexMut};
-
 use self::abs_domain::{AbstractElem, Lift};
+use crate::un_derefer::UnDerefer;
 
 mod abs_domain;