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/collections/binary_heap/mod.rs b/library/alloc/src/collections/binary_heap/mod.rs
index 11aef5f913e..cc5f33c3685 100644
--- a/library/alloc/src/collections/binary_heap/mod.rs
+++ b/library/alloc/src/collections/binary_heap/mod.rs
@@ -144,12 +144,11 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 use core::alloc::Allocator;
-use core::fmt;
 use core::iter::{FusedIterator, InPlaceIterable, SourceIter, TrustedFused, TrustedLen};
 use core::mem::{self, swap, ManuallyDrop};
 use core::num::NonZero;
 use core::ops::{Deref, DerefMut};
-use core::ptr;
+use core::{fmt, ptr};
 
 use crate::alloc::Global;
 use crate::collections::TryReserveError;