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_data_structures/src/graph/dominators/mod.rs

@@ -9,10 +9,11 @@
 //! Thomas Lengauer and Robert Endre Tarjan.
 //! <https://www.cs.princeton.edu/courses/archive/spr03/cs423/download/dominators.pdf>
 
-use super::ControlFlowGraph;
+use std::cmp::Ordering;
+
 use rustc_index::{Idx, IndexSlice, IndexVec};
 
-use std::cmp::Ordering;
+use super::ControlFlowGraph;
 
 #[cfg(test)]
 mod tests;

compiler/rustc_data_structures/src/graph/dominators/tests.rs

@@ -1,6 +1,5 @@
-use super::*;
-
 use super::super::tests::TestGraph;
+use super::*;
 
 #[test]
 fn diamond() {

compiler/rustc_data_structures/src/graph/implementation/mod.rs

@@ -20,8 +20,9 @@
 //! the field `next_edge`). Each of those fields is an array that should
 //! be indexed by the direction (see the type `Direction`).
 
-use rustc_index::bit_set::BitSet;
 use std::fmt::Debug;
+
+use rustc_index::bit_set::BitSet;
 use tracing::debug;
 
 #[cfg(test)]

compiler/rustc_data_structures/src/graph/implementation/tests.rs

@@ -1,6 +1,7 @@
-use crate::graph::implementation::*;
 use tracing::debug;
 
+use crate::graph::implementation::*;
+
 type TestGraph = Graph<&'static str, &'static str>;
 
 fn create_graph() -> TestGraph {

compiler/rustc_data_structures/src/graph/iterate/mod.rs

@@ -1,7 +1,9 @@
-use super::{DirectedGraph, StartNode, Successors};
+use std::ops::ControlFlow;
+
 use rustc_index::bit_set::BitSet;
 use rustc_index::{IndexSlice, IndexVec};
-use std::ops::ControlFlow;
+
+use super::{DirectedGraph, StartNode, Successors};
 
 #[cfg(test)]
 mod tests;

compiler/rustc_data_structures/src/graph/iterate/tests.rs

@@ -1,5 +1,4 @@
 use super::super::tests::TestGraph;
-
 use super::*;
 
 #[test]

compiler/rustc_data_structures/src/graph/scc/mod.rs

@@ -8,13 +8,15 @@
 //! Typical examples would include: minimum element in SCC, maximum element
 //! reachable from it, etc.
 
+use std::fmt::Debug;
+use std::ops::Range;
+
+use rustc_index::{Idx, IndexSlice, IndexVec};
+use tracing::{debug, instrument};
+
 use crate::fx::FxHashSet;
 use crate::graph::vec_graph::VecGraph;
 use crate::graph::{DirectedGraph, NumEdges, Successors};
-use rustc_index::{Idx, IndexSlice, IndexVec};
-use std::fmt::Debug;
-use std::ops::Range;
-use tracing::{debug, instrument};
 
 #[cfg(test)]
 mod tests;

compiler/rustc_data_structures/src/graph/tests.rs

@@ -1,7 +1,7 @@
-use crate::fx::FxHashMap;
 use std::cmp::max;
 
 use super::*;
+use crate::fx::FxHashMap;
 
 pub struct TestGraph {
     num_nodes: usize,

compiler/rustc_data_structures/src/graph/vec_graph/mod.rs

@@ -1,6 +1,7 @@
-use crate::graph::{DirectedGraph, NumEdges, Predecessors, Successors};
 use rustc_index::{Idx, IndexVec};
 
+use crate::graph::{DirectedGraph, NumEdges, Predecessors, Successors};
+
 #[cfg(test)]
 mod tests;
 

compiler/rustc_data_structures/src/graph/vec_graph/tests.rs

@@ -1,6 +1,5 @@
-use crate::graph;
-
 use super::*;
+use crate::graph;
 
 fn create_graph() -> VecGraph<usize> {
     // Create a simple graph