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, 3 deletions

diff --git a/library/core/src/alloc/layout.rs b/library/core/src/alloc/layout.rs
index 431b07035c3..549a4bc6727 100644
--- a/library/core/src/alloc/layout.rs
+++ b/library/core/src/alloc/layout.rs
@@ -4,11 +4,9 @@
 // collections, resulting in having to optimize down excess IR multiple times.
 // Your performance intuition is useless. Run perf.
 
-use crate::cmp;
 use crate::error::Error;
-use crate::fmt;
-use crate::mem;
 use crate::ptr::{Alignment, NonNull};
+use crate::{cmp, fmt, mem};
 
 // While this function is used in one place and its implementation
 // could be inlined, the previous attempts to do so made rustc