From 8a60a561c95691912cbf41d55866abafcba0127d Mon Sep 17 00:00:00 2001
From: EdJoPaTo
 <rfc-conform-git-commit-email@funny-long-domain-label-everyone-hates-as-it-is-too-long.edjopato.de>
Date: Sat, 25 May 2024 03:32:22 +0200
Subject: [PATCH] refactor: needless_pass_by_ref_mut (#1137)

<https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut>
---
 Cargo.toml             | 1 +
 examples/user_input.rs | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 3f99a4db..74906f04 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -88,6 +88,7 @@ map_err_ignore = "warn"
 missing_const_for_fn = "warn"
 mixed_read_write_in_expression = "warn"
 mod_module_files = "warn"
+needless_pass_by_ref_mut = "warn"
 needless_raw_strings = "warn"
 redundant_type_annotations = "warn"
 rest_pat_in_fully_bound_structs = "warn"
diff --git a/examples/user_input.rs b/examples/user_input.rs
index f4df4d6e..5aeb5783 100644
--- a/examples/user_input.rs
+++ b/examples/user_input.rs
@@ -86,7 +86,7 @@ impl App {
     ///
     /// Since each character in a string can be contain multiple bytes, it's necessary to calculate
     /// the byte index based on the index of the character.
-    fn byte_index(&mut self) -> usize {
+    fn byte_index(&self) -> usize {
         self.input
             .char_indices()
             .map(|(i, _)| i)