rust: use `kernel::{fmt,prelude::fmt!}`

Reduce coupling to implementation details of the formatting machinery by
avoiding direct use for `core`'s formatting traits and macros.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250704-core-cstr-prepare-v1-3-a91524037783@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/samples/rust/rust_print_main.rs b/samples/rust/rust_print_main.rs
index 8ea95e8c2f36..4095c72afeab 100644
--- a/samples/rust/rust_print_main.rs
+++ b/samples/rust/rust_print_main.rs
@@ -40,7 +40,7 @@ fn arc_print() -> Result {
         // behaviour, contract or protocol on both `i32` and `&str` into a single `Arc` of
         // type `Arc<dyn Display>`.
 
-        use core::fmt::Display;
+        use kernel::fmt::Display;
         fn arc_dyn_print(arc: &Arc<dyn Display>) {
             pr_info!("Arc<dyn Display> says {arc}");
         }