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, 2 insertions, 4 deletions

diff --git a/library/alloc/tests/string.rs b/library/alloc/tests/string.rs
index e20ceae87b0..c5bc4185a36 100644
--- a/library/alloc/tests/string.rs
+++ b/library/alloc/tests/string.rs
@@ -2,11 +2,9 @@ use std::assert_matches::assert_matches;
 use std::borrow::Cow;
 use std::cell::Cell;
 use std::collections::TryReserveErrorKind::*;
-use std::ops::Bound;
 use std::ops::Bound::*;
-use std::ops::RangeBounds;
-use std::panic;
-use std::str;
+use std::ops::{Bound, RangeBounds};
+use std::{panic, str};
 
 pub trait IntoCow<'a, B: ?Sized>
 where