From 0b4ccf45fc5a7de9ccff48dd33c8458bff1d20c9 Mon Sep 17 00:00:00 2001
From: matejcik <ja@matejcik.cz>
Date: Mon, 15 Aug 2022 15:01:13 +0200
Subject: [PATCH] style(core/rust): less expensive conversion from known good
 utf8 string

---
 core/embed/rust/src/trezorhal/slip39.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/embed/rust/src/trezorhal/slip39.rs b/core/embed/rust/src/trezorhal/slip39.rs
index 7ccaba95b..6d061c885 100644
--- a/core/embed/rust/src/trezorhal/slip39.rs
+++ b/core/embed/rust/src/trezorhal/slip39.rs
@@ -1,3 +1,4 @@
+use core::str;
 use cstr_core::CStr;
 
 use super::ffi;
@@ -25,6 +26,6 @@ pub fn button_sequence_to_word(prefix: u16) -> Option<&'static str> {
     } else {
         // SAFETY: On success, `button_sequence_to_word` should return a 0-terminated
         // UTF-8 string with static lifetime.
-        Some(unsafe { CStr::from_ptr(word).to_str().unwrap_unchecked() })
+        Some(unsafe { str::from_utf8_unchecked(CStr::from_ptr(word).to_bytes()) })
     }
 }