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_incremental/src/assert_dep_graph.rs

@@ -33,12 +33,12 @@
 //! fn baz() { foo(); }
 //! ```
 
-use crate::errors;
-use rustc_ast as ast;
+use std::env;
+use std::fs::{self, File};
+use std::io::{BufWriter, Write};
+
 use rustc_data_structures::fx::FxIndexSet;
 use rustc_data_structures::graph::implementation::{Direction, NodeIndex, INCOMING, OUTGOING};
-use rustc_graphviz as dot;
-use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_middle::dep_graph::{
@@ -49,10 +49,10 @@ use rustc_middle::ty::TyCtxt;
 use rustc_middle::{bug, span_bug};
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::Span;
-use std::env;
-use std::fs::{self, File};
-use std::io::{BufWriter, Write};
 use tracing::debug;
+use {rustc_ast as ast, rustc_graphviz as dot, rustc_hir as hir};
+
+use crate::errors;
 
 #[allow(missing_docs)]
 pub fn assert_dep_graph(tcx: TyCtxt<'_>) {

compiler/rustc_incremental/src/errors.rs

@@ -1,7 +1,9 @@
-use rustc_macros::Diagnostic;
-use rustc_span::{symbol::Ident, Span, Symbol};
 use std::path::{Path, PathBuf};
 
+use rustc_macros::Diagnostic;
+use rustc_span::symbol::Ident;
+use rustc_span::{Span, Symbol};
+
 #[derive(Diagnostic)]
 #[diag(incremental_unrecognized_depnode)]
 pub struct UnrecognizedDepNode {

compiler/rustc_incremental/src/lib.rs

@@ -12,14 +12,10 @@ mod assert_dep_graph;
 mod errors;
 mod persist;
 
-pub use persist::copy_cgu_workproduct_to_incr_comp_cache_dir;
-pub use persist::finalize_session_directory;
-pub use persist::in_incr_comp_dir;
-pub use persist::in_incr_comp_dir_sess;
-pub use persist::load_query_result_cache;
-pub use persist::save_dep_graph;
-pub use persist::save_work_product_index;
-pub use persist::setup_dep_graph;
-pub use persist::LoadResult;
+pub use persist::{
+    copy_cgu_workproduct_to_incr_comp_cache_dir, finalize_session_directory, in_incr_comp_dir,
+    in_incr_comp_dir_sess, load_query_result_cache, save_dep_graph, save_work_product_index,
+    setup_dep_graph, LoadResult,
+};
 
 rustc_fluent_macro::fluent_messages! { "../messages.ftl" }

compiler/rustc_incremental/src/persist/dirty_clean.rs

@@ -19,14 +19,11 @@
 //! Errors are reported if we are in the suitable configuration but
 //! the required condition is not met.
 
-use crate::errors;
 use rustc_ast::{self as ast, Attribute, NestedMetaItem};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::unord::UnordSet;
 use rustc_hir::def_id::LocalDefId;
-use rustc_hir::intravisit;
-use rustc_hir::Node as HirNode;
-use rustc_hir::{ImplItemKind, ItemKind as HirItem, TraitItemKind};
+use rustc_hir::{intravisit, ImplItemKind, ItemKind as HirItem, Node as HirNode, TraitItemKind};
 use rustc_middle::dep_graph::{label_strs, DepNode, DepNodeExt};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::TyCtxt;
@@ -35,6 +32,8 @@ use rustc_span::Span;
 use thin_vec::ThinVec;
 use tracing::debug;
 
+use crate::errors;
+
 const LOADED_FROM_DISK: Symbol = sym::loaded_from_disk;
 const EXCEPT: Symbol = sym::except;
 const CFG: Symbol = sym::cfg;

compiler/rustc_incremental/src/persist/file_format.rs

@@ -9,18 +9,19 @@
 //! compiler versions don't change frequently for the typical user, being
 //! conservative here practically has no downside.
 
-use crate::errors;
+use std::borrow::Cow;
+use std::io::{self, Read};
+use std::path::{Path, PathBuf};
+use std::{env, fs};
+
 use rustc_data_structures::memmap::Mmap;
 use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
 use rustc_serialize::Encoder;
 use rustc_session::Session;
-use std::borrow::Cow;
-use std::env;
-use std::fs;
-use std::io::{self, Read};
-use std::path::{Path, PathBuf};
 use tracing::debug;
 
+use crate::errors;
+
 /// The first few bytes of files generated by incremental compilation.
 const FILE_MAGIC: &[u8] = b"RSIC";
 

compiler/rustc_incremental/src/persist/fs.rs

@@ -103,30 +103,27 @@
 //! unsupported file system and emit a warning in that case. This is not yet
 //! implemented.
 
-use crate::errors;
-use rustc_data_structures::base_n;
-use rustc_data_structures::base_n::BaseNString;
-use rustc_data_structures::base_n::ToBaseN;
-use rustc_data_structures::base_n::CASE_INSENSITIVE;
-use rustc_data_structures::flock;
-use rustc_data_structures::fx::{FxHashSet, FxIndexSet};
-use rustc_data_structures::svh::Svh;
-use rustc_data_structures::unord::{UnordMap, UnordSet};
-use rustc_errors::ErrorGuaranteed;
-use rustc_fs_util::{link_or_copy, try_canonicalize, LinkOrCopy};
-use rustc_middle::bug;
-use rustc_session::config::CrateType;
-use rustc_session::output::{collect_crate_types, find_crate_name};
-use rustc_session::{Session, StableCrateId};
-
 use std::fs as std_fs;
 use std::io::{self, ErrorKind};
 use std::path::{Path, PathBuf};
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
 use rand::{thread_rng, RngCore};
+use rustc_data_structures::base_n::{BaseNString, ToBaseN, CASE_INSENSITIVE};
+use rustc_data_structures::fx::{FxHashSet, FxIndexSet};
+use rustc_data_structures::svh::Svh;
+use rustc_data_structures::unord::{UnordMap, UnordSet};
+use rustc_data_structures::{base_n, flock};
+use rustc_errors::ErrorGuaranteed;
+use rustc_fs_util::{link_or_copy, try_canonicalize, LinkOrCopy};
+use rustc_middle::bug;
+use rustc_session::config::CrateType;
+use rustc_session::output::{collect_crate_types, find_crate_name};
+use rustc_session::{Session, StableCrateId};
 use tracing::debug;
 
+use crate::errors;
+
 #[cfg(test)]
 mod tests;
 

compiler/rustc_incremental/src/persist/load.rs

@@ -1,6 +1,8 @@
 //! Code to load the dep-graph from files.
 
-use crate::errors;
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+
 use rustc_data_structures::memmap::Mmap;
 use rustc_data_structures::unord::UnordMap;
 use rustc_middle::dep_graph::{DepGraph, DepsType, SerializedDepGraph, WorkProductMap};
@@ -10,15 +12,13 @@ use rustc_serialize::Decodable;
 use rustc_session::config::IncrementalStateAssertion;
 use rustc_session::Session;
 use rustc_span::ErrorGuaranteed;
-use std::path::{Path, PathBuf};
-use std::sync::Arc;
 use tracing::{debug, warn};
 
 use super::data::*;
-use super::file_format;
 use super::fs::*;
 use super::save::build_dep_graph;
-use super::work_product;
+use super::{file_format, work_product};
+use crate::errors;
 
 #[derive(Debug)]
 /// Represents the result of an attempt to load incremental compilation data.

compiler/rustc_incremental/src/persist/mod.rs

@@ -10,12 +10,7 @@ mod load;
 mod save;
 mod work_product;
 
-pub use fs::finalize_session_directory;
-pub use fs::in_incr_comp_dir;
-pub use fs::in_incr_comp_dir_sess;
-pub use load::load_query_result_cache;
-pub use load::setup_dep_graph;
-pub use load::LoadResult;
-pub use save::save_dep_graph;
-pub use save::save_work_product_index;
+pub use fs::{finalize_session_directory, in_incr_comp_dir, in_incr_comp_dir_sess};
+pub use load::{load_query_result_cache, setup_dep_graph, LoadResult};
+pub use save::{save_dep_graph, save_work_product_index};
 pub use work_product::copy_cgu_workproduct_to_incr_comp_cache_dir;

compiler/rustc_incremental/src/persist/save.rs

@@ -1,5 +1,6 @@
-use crate::assert_dep_graph::assert_dep_graph;
-use crate::errors;
+use std::fs;
+use std::sync::Arc;
+
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync::join;
 use rustc_middle::dep_graph::{
@@ -9,15 +10,13 @@ use rustc_middle::ty::TyCtxt;
 use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
 use rustc_serialize::Encodable as RustcEncodable;
 use rustc_session::Session;
-use std::fs;
-use std::sync::Arc;
 use tracing::debug;
 
 use super::data::*;
-use super::dirty_clean;
-use super::file_format;
 use super::fs::*;
-use super::work_product;
+use super::{dirty_clean, file_format, work_product};
+use crate::assert_dep_graph::assert_dep_graph;
+use crate::errors;
 
 /// Saves and writes the [`DepGraph`] to the file system.
 ///

compiler/rustc_incremental/src/persist/work_product.rs

@@ -2,16 +2,18 @@
 //!
 //! [work products]: WorkProduct
 
-use crate::errors;
-use crate::persist::fs::*;
+use std::fs as std_fs;
+use std::path::Path;
+
 use rustc_data_structures::unord::UnordMap;
 use rustc_fs_util::link_or_copy;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_session::Session;
-use std::fs as std_fs;
-use std::path::Path;
 use tracing::debug;
 
+use crate::errors;
+use crate::persist::fs::*;
+
 /// Copies a CGU work product to the incremental compilation directory, so next compilation can
 /// find and reuse it.
 pub fn copy_cgu_workproduct_to_incr_comp_cache_dir(