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, 1 deletions

diff --git a/library/alloc/src/vec/drain.rs b/library/alloc/src/vec/drain.rs
index f0b63759ac7..9362cef2a1b 100644
--- a/library/alloc/src/vec/drain.rs
+++ b/library/alloc/src/vec/drain.rs
@@ -1,4 +1,3 @@
-use crate::alloc::{Allocator, Global};
 use core::fmt;
 use core::iter::{FusedIterator, TrustedLen};
 use core::mem::{self, ManuallyDrop, SizedTypeProperties};
@@ -6,6 +5,7 @@ use core::ptr::{self, NonNull};
 use core::slice::{self};
 
 use super::Vec;
+use crate::alloc::{Allocator, Global};
 
 /// A draining iterator for `Vec<T>`.
 ///