Auto merge of #3927 - RalfJung:fmt-imports, r=oli-obk,saethlin

let rustfmt format imports

This matches the recent change in rustc.

`@rust-lang/miri` what do you think?

src/tools/miri/bench-cargo-miri/backtraces/src/main.rs

@@ -1,8 +1,9 @@
 //! Extracted from the backtrace crate's test test_frame_conversion
 
-use backtrace::{Backtrace, BacktraceFrame};
 use std::fmt::Write;
 
+use backtrace::{Backtrace, BacktraceFrame};
+
 fn main() {
     let mut frames = vec![];
     backtrace::trace(|frame| {

src/tools/miri/bench-cargo-miri/serde2/src/main.rs

@@ -1,9 +1,10 @@
 // Like serde1, but in two threads concurrently. And we don't print.
 static JSON: &str = r#"{"buffer":[-29,-42,-40,-37,-28,-5,-21,1,-24,-8,-20,4,-18,26,-24,44,-26,66,-30,86,-37,88,-41,72,-46,50,-31,28,23,14,64,16,51,26,32,34,39,42,48,35,58,0,72,-36,69,-59,58,-98,54,-124,36,-103,12,-110,5,-173,-19,-146,-59,-4,-42,51,1,-23,-6,-30,-6,45,46,47,70,6,55,19,60,38,62,42,47,61,46,40,42,-19,22,-34,6,-35,-50,-61,-141,-37,-171,17,-163,26,-180,46,-154,80,-63,48,-4,18,20,50,47,58,53,44,61,57,85,37,80,0,86,-8,106,-95,49,-213,-8,-131,47,49,63,40,-39,-69,-74,-37,-20,63,-12,58,-14,-12,25,-31,41,11,45,76,47,167,5,261,-37,277,-83,183,-172,35,-122,-79,138,-70,266,69,124,228,0,391,-29,594,-84,702,-78,627,-8,551,-13,509,13,372,120,352,125,622,127,691,223,362,126,386,-33,915,198,958,457,456,298,500,233,1027,469,1096,426,918,160,1067,141,1220,189,1245,164,1375,297,1378,503,1299,702,1550,929,1799,855,1752,547,1830,602,1928,832,1736,796,1735,933,1961,1385,1935,1562,2105,1485,2716,1449,2948,1305,2768,1205,2716,1346,2531,1450,2470,1653,3117,2111,3370,2176,2696,1947,2925,2305,3846,2658,2425,2184,-877,1981,-2261,2623,-1645,2908,-1876,2732,-2704,2953,-2484,3116,-2120,2954,-2442,3216,-2466,3499,-2192,3234,-2392,3361,-2497,3869,-2078,3772,-1858,3915,-2066,4438,-2285,2934,-2294,-280,-2066,-1762,-1992,-1412,-2298,-1535,-2399,-1789,-2223,-1419,-2244,-1334,-2092,-1476,-1777,-1396,-2014,-1571,-2199,-1574,-1843,-1167,-1910,-1446,-2007,-1818,-1506,-1331,-2526,-2048,-5535,-4573,-7148,-5828,-6422,-5327,-5840,-5488,-5992,-6144,-6014,-6164,-6109,-6234,-6271,-6388,-6288,-6156,-6517,-6249,-6794,-6602,-6822,-6418,-6788,-6245,-6490,-6560,-6394,-6794,-7920,-6937,-10397,-7140,-11428,-6972,-11019,-6610,-11141,-6665,-11913,-7046,-11979,-7235,-11599,-7015,-11854,-6912,-12161,-7441,-12136,-7761,-12861,-7292,-13390,-7254,-12345,-7809,-12490,-7463,-13983,-6969,-10489,-8465,-2382,-11054,1272,-12247,-270,-12060,-323,-12113,502,-12486,-697,-12251,-1086,-12141,-181,-13116,-670,-13509,-1173,-12592,-443,-12811,-449,-13698,-934,-12850,-747,-13083,-873,-15036,-1161,-11478,-1047,-2669,-1407,1006,-1658,-1146,-1195,-1297,-1421,-73,-1946,-977,-1590,-1499,-1577,-1010,-1862,-1256,-1389,-962,-1692,-509,-2613,-1317,-2087,-1359,-1997,-1034,-2891,-2024,-119,-84,5651,5723,8074,8306,7156,6870,6985,7106,7312,8403,7114,8096,7173,7848,7082,7827,6761,7189,6985,7368,7076,7835,6992,7297,7453,7260,7016,7755,6025,7429,8533,7352,14150,7628,17142,7077,16399,6947,15939,7475,16564,7069,16463,6882,16400,7602,17031,7233,16543,6517,15395,7018,15985,7104,16689,6869,15655,7622,16155,7198,17884,6022,14056,8856,5665,14484,1815,16782,3034,15786,3107,15664,2312,16517,2965,16443,3036,16120,2287,16584,2479,16720,2693,16073,2535,16159,2958,16609,3067,16086,2716,16579,3035,17752,3092,13704,2499,5265,2620,1452,2808,3024,2444,3275,2839,2267,3340,2857,2968,3232,3066,2867,3152,3072,2248,2961,2413,2807,3238,3237,2368,2699,2262,2392,3537,3339,827,823,-5020,-5359,-7095,-7857,-5973,-6274,-6208,-6279,-6934,-7181,-6893,-6647,-7146,-6687,-7026,-7328,-6451,-6924,-6763,-6535,-7109,-6639,-6926,-6559,-7188,-6799,-6727,-6955,-5786,-6554,-8543,-6796,-14465,-7190,-17356,-6641,-16372,-6529,-15941,-6898,-16526,-6434,-16219,-6520,-16222,-7449,-17077,-7097,-16665,-6476,-15675,-7026,-16498,-6848,-17147,-6271,-15894,-7069,-16266,-7032,-17817,-5991,-13796,-8594,-5421,-14349,-1649,-17288,-2847,-16525,-2974,-15945,-2324,-16482,-3022,-16593,-3097,-16451,-2420,-16780,-2649,-16641,-2836,-15900,-2660,-16214,-3050,-16827,-3111,-15993,-2741,-16151,-2994,-17537,-2933,-13812,-2314,-5216,-2475,-1125,-2648,-2801,-2290,-3285,-2796,-2243,-3415,-2642,-3109,-3000,-3271,-2839,-3408,-3161,-2497,-2876,-2603,-2570,-3351,-3173,-2416,-2832,-2235,-2408,-3405,-3186,-613,-768,5271,5201,7376,7644,6241,6176,6366,6275,6964,7124,6831,6508,6998,6566,6836,7230,6277,6777,6589,6376,6934,6536,6819,6494,7160,6749,6736,6900,5822,6476,8593,6747,14520,7204,17448,6637,16490,6483,16033,6906,16600,6511,16304,6568,16279,7438,17079,7072,16624,6463,15577,7028,16343,6877,16990,6331,15760,7121,16140,7023,17719,5944,13748,8575,5401,14336,1645,17210,2880,16419,3036,15896,2382,16483,3074,16584,3143,16425,2443,16782,2650,16695,2825,15978,2632,16272,3015,16880,3084,16096,2709,16289,2965,17641,2932,13887,2323,5330,2474,1286,2656,2954,2309,3410,2803,2373,3414,2795,3106,3151,3263,2952,3403,3241,2483,2969,2568,2681,3316,3245,2383,2837,2199,2390,3396,3165,641,706,-5230,-5323,-7307,-7790,-6136,-6317,-6268,-6419,-6884,-7278,-6766,-6666,-6976,-6731,-6853,-7406,-6308,-6958,-6636,-6553,-6978,-6703,-6829,-6647,-7156,-6883,-6737,-7017,-5814,-6581,-8575,-6833,-14490,-7270,-17411,-6699,-16466,-6539,-16016,-6931,-16571,-6504,-16257,-6551,-16202,-7408,-16983,-7021,-16545,-6410,-15512,-6976,-16305,-6803,-17017,-6243,-15820,-7037,-16197,-6923,-17802,-5820,-13840,-8455,-5475,-14227,-1724,-17099,-2923,-16314,-3008,-15801,-2362,-16392,-3088,-16506,-3163,-16356,-2503,-16700,-2717,-16605,-2855,-15904,-2710,-16226,-3108,-16870,-3089,-16101,-2747,-16257,-3087,-17584,-2975,-13868,-2324,-5343,-2548,-1275,-2673,-2917,-2213,-3363,-2694,-2311,-3251,-2744,-2867,-3129,-3034,-2939,-3190,-3234,-2346,-2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
-use serde::Deserialize;
 use std::thread;
 
+use serde::Deserialize;
+
 #[derive(Deserialize)]
 #[allow(unused)]
 struct DeriveStruct {

src/tools/miri/cargo-miri/src/phases.rs

@@ -8,7 +8,8 @@ use std::{env, thread};
 
 use rustc_version::VersionMeta;
 
-use crate::{setup::*, util::*};
+use crate::setup::*;
+use crate::util::*;
 
 const CARGO_MIRI_HELP: &str = r"Runs binary crates and tests in Miri
 

src/tools/miri/miri-script/src/args.rs

@@ -1,5 +1,4 @@
-use std::env;
-use std::iter;
+use std::{env, iter};
 
 use anyhow::{Result, bail};
 

src/tools/miri/miri-script/src/commands.rs

@@ -1,12 +1,9 @@
-use std::env;
 use std::ffi::{OsStr, OsString};
 use std::io::Write;
-use std::net;
-use std::ops::Not;
-use std::ops::Range;
+use std::ops::{Not, Range};
 use std::path::PathBuf;
-use std::process;
 use std::time::Duration;
+use std::{env, net, process};
 
 use anyhow::{Context, Result, anyhow, bail};
 use path_macro::path;

src/tools/miri/rustfmt.toml

@@ -1,5 +1,10 @@
+# This matches rustc
 style_edition = "2024"
 use_small_heuristics = "Max"
+group_imports = "StdExternalCrate"
+imports_granularity = "Module"
+
+# Miri-specific settings
+force_multiline_blocks = true
 match_arm_blocks = false
 match_arm_leading_pipes = "Preserve"
-force_multiline_blocks = true

src/tools/miri/src/alloc_addresses/mod.rs

@@ -7,14 +7,13 @@ use std::cell::RefCell;
 use std::cmp::max;
 
 use rand::Rng;
-
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_span::Span;
 use rustc_target::abi::{Align, Size};
 
-use crate::{concurrency::VClock, *};
-
 use self::reuse_pool::ReusePool;
+use crate::concurrency::VClock;
+use crate::*;
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub enum ProvenanceMode {

src/tools/miri/src/alloc_addresses/reuse_pool.rs

@@ -1,10 +1,10 @@
 //! Manages a pool of addresses that can be reused.
 
 use rand::Rng;
-
 use rustc_target::abi::{Align, Size};
 
-use crate::{MemoryKind, MiriConfig, ThreadId, concurrency::VClock};
+use crate::concurrency::VClock;
+use crate::{MemoryKind, MiriConfig, ThreadId};
 
 const MAX_POOL_SIZE: usize = 64;
 

src/tools/miri/src/alloc_bytes.rs

@@ -1,7 +1,6 @@
-use std::alloc;
 use std::alloc::Layout;
 use std::borrow::Cow;
-use std::slice;
+use std::{alloc, slice};
 
 use rustc_middle::mir::interpret::AllocBytes;
 use rustc_target::abi::{Align, Size};

src/tools/miri/src/bin/miri.rs

@@ -28,31 +28,27 @@ use std::num::NonZero;
 use std::path::PathBuf;
 use std::str::FromStr;
 
-use tracing::debug;
-
+use miri::{BacktraceStyle, BorrowTrackerMethod, ProvenanceMode, RetagFields, ValidationMode};
 use rustc_data_structures::sync::Lrc;
 use rustc_driver::Compilation;
 use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_hir::{self as hir, Node};
 use rustc_hir_analysis::check::check_function_signature;
 use rustc_interface::interface::Config;
-use rustc_middle::{
-    middle::{
-        codegen_fn_attrs::CodegenFnAttrFlags,
-        exported_symbols::{ExportedSymbol, SymbolExportInfo, SymbolExportKind, SymbolExportLevel},
-    },
-    query::LocalCrate,
-    traits::{ObligationCause, ObligationCauseCode},
-    ty::{self, Ty, TyCtxt},
-    util::Providers,
+use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
+use rustc_middle::middle::exported_symbols::{
+    ExportedSymbol, SymbolExportInfo, SymbolExportKind, SymbolExportLevel,
 };
+use rustc_middle::query::LocalCrate;
+use rustc_middle::traits::{ObligationCause, ObligationCauseCode};
+use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_middle::util::Providers;
 use rustc_session::config::{CrateType, EntryFnType, ErrorOutputType, OptLevel};
 use rustc_session::search_paths::PathKind;
 use rustc_session::{CtfeBacktrace, EarlyDiagCtxt};
 use rustc_span::def_id::DefId;
 use rustc_target::spec::abi::Abi;
-
-use miri::{BacktraceStyle, BorrowTrackerMethod, ProvenanceMode, RetagFields, ValidationMode};
+use tracing::debug;
 
 struct MiriCompilerCalls {
     miri_config: miri::MiriConfig,

src/tools/miri/src/borrow_tracker/mod.rs

@@ -2,11 +2,10 @@ use std::cell::RefCell;
 use std::fmt;
 use std::num::NonZero;
 
-use smallvec::SmallVec;
-
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_middle::mir::RetagKind;
 use rustc_target::abi::Size;
+use smallvec::SmallVec;
 
 use crate::*;
 pub mod stacked_borrows;

src/tools/miri/src/borrow_tracker/stacked_borrows/diagnostics.rs

@@ -1,9 +1,9 @@
-use smallvec::SmallVec;
 use std::fmt;
 
 use rustc_data_structures::fx::FxHashSet;
 use rustc_span::{Span, SpanData};
 use rustc_target::abi::Size;
+use smallvec::SmallVec;
 
 use crate::borrow_tracker::{GlobalStateInner, ProtectorKind};
 use crate::*;

src/tools/miri/src/borrow_tracker/stacked_borrows/mod.rs

@@ -6,25 +6,24 @@ mod item;
 mod stack;
 
 use std::cell::RefCell;
-use std::cmp;
 use std::fmt::Write;
-use std::mem;
+use std::{cmp, mem};
 
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::mir::{Mutability, RetagKind};
-use rustc_middle::ty::{self, Ty, layout::HasParamEnv};
+use rustc_middle::ty::layout::HasParamEnv;
+use rustc_middle::ty::{self, Ty};
 use rustc_target::abi::{Abi, Size};
 
-use crate::borrow_tracker::{
-    GlobalStateInner, ProtectorKind,
-    stacked_borrows::diagnostics::{AllocHistory, DiagnosticCx, DiagnosticCxBuilder},
-};
-use crate::concurrency::data_race::{NaReadType, NaWriteType};
-use crate::*;
-
 use self::diagnostics::{RetagCause, RetagInfo};
 pub use self::item::{Item, Permission};
 pub use self::stack::Stack;
+use crate::borrow_tracker::stacked_borrows::diagnostics::{
+    AllocHistory, DiagnosticCx, DiagnosticCxBuilder,
+};
+use crate::borrow_tracker::{GlobalStateInner, ProtectorKind};
+use crate::concurrency::data_race::{NaReadType, NaWriteType};
+use crate::*;
 
 pub type AllocState = Stacks;
 

src/tools/miri/src/borrow_tracker/stacked_borrows/stack.rs

@@ -5,10 +5,8 @@ use rustc_data_structures::fx::FxHashSet;
 use tracing::trace;
 
 use crate::ProvenanceExtra;
-use crate::borrow_tracker::{
-    AccessKind, BorTag,
-    stacked_borrows::{Item, Permission},
-};
+use crate::borrow_tracker::stacked_borrows::{Item, Permission};
+use crate::borrow_tracker::{AccessKind, BorTag};
 
 /// Exactly what cache size we should use is a difficult trade-off. There will always be some
 /// workload which has a `BorTag` working set which exceeds the size of the cache, and ends up

src/tools/miri/src/borrow_tracker/tree_borrows/diagnostics.rs

@@ -5,11 +5,9 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_span::{Span, SpanData};
 
 use crate::borrow_tracker::ProtectorKind;
-use crate::borrow_tracker::tree_borrows::{
-    perms::{PermTransition, Permission},
-    tree::LocationState,
-    unimap::UniIndex,
-};
+use crate::borrow_tracker::tree_borrows::perms::{PermTransition, Permission};
+use crate::borrow_tracker::tree_borrows::tree::LocationState;
+use crate::borrow_tracker::tree_borrows::unimap::UniIndex;
 use crate::*;
 
 /// Cause of an access: either a real access or one

src/tools/miri/src/borrow_tracker/tree_borrows/mod.rs

@@ -1,15 +1,12 @@
-use rustc_middle::{
-    mir::{Mutability, RetagKind},
-    ty::{self, Ty, layout::HasParamEnv},
-};
+use rustc_middle::mir::{Mutability, RetagKind};
+use rustc_middle::ty::layout::HasParamEnv;
+use rustc_middle::ty::{self, Ty};
 use rustc_span::def_id::DefId;
 use rustc_target::abi::{Abi, Size};
 
+use crate::borrow_tracker::{GlobalState, GlobalStateInner, ProtectorKind};
+use crate::concurrency::data_race::NaReadType;
 use crate::*;
-use crate::{
-    borrow_tracker::{GlobalState, GlobalStateInner, ProtectorKind},
-    concurrency::data_race::NaReadType,
-};
 
 pub mod diagnostics;
 mod perms;

src/tools/miri/src/borrow_tracker/tree_borrows/tree.rs

@@ -12,18 +12,17 @@
 
 use std::{fmt, mem};
 
-use smallvec::SmallVec;
-
 use rustc_data_structures::fx::FxHashSet;
 use rustc_span::Span;
 use rustc_target::abi::Size;
+use smallvec::SmallVec;
 
-use crate::borrow_tracker::tree_borrows::{
-    Permission,
-    diagnostics::{self, NodeDebugInfo, TbError, TransitionError},
-    perms::PermTransition,
-    unimap::{UniEntry, UniIndex, UniKeyMap, UniValMap},
+use crate::borrow_tracker::tree_borrows::Permission;
+use crate::borrow_tracker::tree_borrows::diagnostics::{
+    self, NodeDebugInfo, TbError, TransitionError,
 };
+use crate::borrow_tracker::tree_borrows::perms::PermTransition;
+use crate::borrow_tracker::tree_borrows::unimap::{UniEntry, UniIndex, UniKeyMap, UniValMap};
 use crate::borrow_tracker::{GlobalState, ProtectorKind};
 use crate::*;
 

src/tools/miri/src/borrow_tracker/tree_borrows/tree/tests.rs

@@ -1,9 +1,10 @@
 //! Tests for the tree
 #![cfg(test)]
 
+use std::fmt;
+
 use super::*;
 use crate::borrow_tracker::tree_borrows::exhaustive::{Exhaustive, precondition};
-use std::fmt;
 
 impl Exhaustive for LocationState {
     fn exhaustive() -> Box<dyn Iterator<Item = Self>> {

src/tools/miri/src/borrow_tracker/tree_borrows/unimap.rs

@@ -12,7 +12,8 @@
 
 #![allow(dead_code)]
 
-use std::{hash::Hash, mem};
+use std::hash::Hash;
+use std::mem;
 
 use rustc_data_structures::fx::FxHashMap;
 

src/tools/miri/src/concurrency/data_race.rs

@@ -40,28 +40,23 @@
 //! code some atomic operations may increment the timestamp when not necessary but this has no effect
 //! on the data-race detection code.
 
-use std::{
-    cell::{Cell, Ref, RefCell, RefMut},
-    fmt::Debug,
-    mem,
-};
+use std::cell::{Cell, Ref, RefCell, RefMut};
+use std::fmt::Debug;
+use std::mem;
 
 use rustc_ast::Mutability;
-use rustc_data_structures::fx::FxHashMap;
-use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_index::{Idx, IndexVec};
-use rustc_middle::{mir, ty::Ty};
+use rustc_middle::mir;
+use rustc_middle::ty::Ty;
 use rustc_span::Span;
 use rustc_target::abi::{Align, HasDataLayout, Size};
 
+use super::vector_clock::{VClock, VTimestamp, VectorIdx};
+use super::weak_memory::EvalContextExt as _;
 use crate::diagnostics::RacingOp;
 use crate::*;
 
-use super::{
-    vector_clock::{VClock, VTimestamp, VectorIdx},
-    weak_memory::EvalContextExt as _,
-};
-
 pub type AllocState = VClockAlloc;
 
 /// Valid atomic read-write orderings, alias of atomic::Ordering (not non-exhaustive).

src/tools/miri/src/concurrency/range_object_map.rs

@@ -2,10 +2,10 @@
 //! ranges and data are discrete and non-splittable -- they represent distinct "objects". An
 //! allocation in the map will always have the same range until explicitly removed
 
-use rustc_target::abi::Size;
 use std::ops::{Index, IndexMut, Range};
 
 use rustc_const_eval::interpret::AllocRange;
+use rustc_target::abi::Size;
 
 #[derive(Clone, Debug)]
 struct Elem<T> {

src/tools/miri/src/concurrency/sync.rs

@@ -1,5 +1,6 @@
 use std::any::Any;
-use std::collections::{VecDeque, hash_map::Entry};
+use std::collections::VecDeque;
+use std::collections::hash_map::Entry;
 use std::ops::Not;
 use std::time::Duration;
 

src/tools/miri/src/concurrency/thread.rs

@@ -7,7 +7,6 @@ use std::task::Poll;
 use std::time::{Duration, SystemTime};
 
 use either::Either;
-
 use rustc_const_eval::CTRL_C_RECEIVED;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::def_id::DefId;

src/tools/miri/src/concurrency/vector_clock.rs

@@ -1,11 +1,10 @@
+use std::cmp::Ordering;
+use std::fmt::Debug;
+use std::ops::{Index, Shr};
+
 use rustc_index::Idx;
 use rustc_span::{DUMMY_SP, Span, SpanData};
 use smallvec::SmallVec;
-use std::{
-    cmp::Ordering,
-    fmt::Debug,
-    ops::{Index, Shr},
-};
 
 use super::data_race::NaReadType;
 
@@ -430,10 +429,12 @@ impl Index<VectorIdx> for VClock {
 ///  test suite
 #[cfg(test)]
 mod tests {
+    use std::cmp::Ordering;
+
+    use rustc_span::DUMMY_SP;
+
     use super::{VClock, VTimestamp, VectorIdx};
     use crate::concurrency::data_race::NaReadType;
-    use rustc_span::DUMMY_SP;
-    use std::cmp::Ordering;
 
     #[test]
     fn test_equal() {