diff --git a/helix-core/src/case_conversion.rs b/helix-core/src/case_conversion.rs
index f0268eed7..358bdf622 100644
--- a/helix-core/src/case_conversion.rs
+++ b/helix-core/src/case_conversion.rs
@@ -135,11 +135,11 @@ pub fn into_alternate_case(chars: impl Iterator<Item = char>, buf: &mut Tendril)
 }
 
 pub fn into_uppercase(chars: impl Iterator<Item = char>, buf: &mut Tendril) {
-    *buf = chars.map(|ch| char::to_ascii_uppercase(&ch)).collect();
+    *buf = chars.flat_map(char::to_uppercase).collect();
 }
 
 pub fn into_lowercase(chars: impl Iterator<Item = char>, buf: &mut Tendril) {
-    *buf = chars.map(|ch| char::to_ascii_lowercase(&ch)).collect();
+    *buf = chars.flat_map(char::to_lowercase).collect();
 }
 
 pub fn into_kebab_case(chars: impl Iterator<Item = char>, buf: &mut Tendril) {
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index adf7b4555..07de5adee 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -70,7 +70,6 @@ use crate::{
 
 use crate::job::{self, Jobs};
 use std::{
-    char::{ToLowercase, ToUppercase},
     cmp::Ordering,
     collections::{HashMap, HashSet},
     error::Error,
@@ -1739,23 +1738,6 @@ where
     exit_select_mode(cx);
 }
 
-fn switch_case(cx: &mut Context) {
-    switch_case_impl(cx, |string| {
-        string
-            .chars()
-            .flat_map(|ch| {
-                if ch.is_lowercase() {
-                    CaseSwitcher::Upper(ch.to_uppercase())
-                } else if ch.is_uppercase() {
-                    CaseSwitcher::Lower(ch.to_lowercase())
-                } else {
-                    CaseSwitcher::Keep(Some(ch))
-                }
-            })
-            .collect()
-    });
-}
-
 fn switch_to_pascal_case(cx: &mut Context) {
     switch_case_impl(cx, |chars| to_pascal_case(chars))
 }