Auto merge of #125443 - nnethercote:rustfmt-use-decls, r=lcnr,cuviper,GuillaumeGomez

rustfmt `use` declarations

This PR implements https://github.com/rust-lang/compiler-team/issues/750, which changes how `use` declarations are formatted by adding these options to `rustfmt.toml`:
```
group_imports = "StdExternalCrate"
imports_granularity = "Module"
```

r? `@ghost`

1 files changed, 7 insertions, 10 deletions

diff --git a/compiler/rustc_trait_selection/src/errors.rs b/compiler/rustc_trait_selection/src/errors.rs
index 0ee4485a365..02fc37d8798 100644
--- a/compiler/rustc_trait_selection/src/errors.rs
+++ b/compiler/rustc_trait_selection/src/errors.rs
@@ -1,19 +1,18 @@
+use std::path::PathBuf;
+
 use rustc_data_structures::fx::FxHashSet;
+use rustc_errors::codes::*;
 use rustc_errors::{
-    codes::*, Applicability, Diag, DiagCtxtHandle, DiagMessage, DiagStyledString, Diagnostic,
+    Applicability, Diag, DiagCtxtHandle, DiagMessage, DiagStyledString, Diagnostic,
     EmissionGuarantee, IntoDiagArg, Level, MultiSpan, SubdiagMessageOp, Subdiagnostic,
 };
 use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;
 use rustc_hir::intravisit::{walk_ty, Visitor};
-use rustc_hir::FnRetTy;
-use rustc_hir::GenericParamKind;
+use rustc_hir::{FnRetTy, GenericParamKind};
 use rustc_macros::{Diagnostic, Subdiagnostic};
-use rustc_middle::ty::print::TraitRefPrintOnlyTraitPath;
-use rustc_middle::ty::{
-    self, print::PrintTraitRefExt as _, Binder, ClosureKind, FnSig, PolyTraitRef, Region, Ty,
-    TyCtxt,
-};
+use rustc_middle::ty::print::{PrintTraitRefExt as _, TraitRefPrintOnlyTraitPath};
+use rustc_middle::ty::{self, Binder, ClosureKind, FnSig, PolyTraitRef, Region, Ty, TyCtxt};
 use rustc_span::symbol::{kw, Ident, Symbol};
 use rustc_span::{BytePos, Span};
 
@@ -22,8 +21,6 @@ use crate::error_reporting::infer::nice_region_error::placeholder_error::Highlig
 use crate::error_reporting::infer::ObligationCauseAsDiagArg;
 use crate::fluent_generated as fluent;
 
-use std::path::PathBuf;
-
 pub mod note_and_explain;
 
 #[derive(Diagnostic)]