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, 1 insertions, 2 deletions

diff --git a/library/alloc/src/vec/spec_from_elem.rs b/library/alloc/src/vec/spec_from_elem.rs
index 01a6db14474..96d701e15d4 100644
--- a/library/alloc/src/vec/spec_from_elem.rs
+++ b/library/alloc/src/vec/spec_from_elem.rs
@@ -1,10 +1,9 @@
 use core::ptr;
 
+use super::{IsZero, Vec};
 use crate::alloc::Allocator;
 use crate::raw_vec::RawVec;
 
-use super::{IsZero, Vec};
-
 // Specialization trait used for Vec::from_elem
 pub(super) trait SpecFromElem: Sized {
     fn from_elem<A: Allocator>(elem: Self, n: usize, alloc: A) -> Vec<Self, A>;