diff --git a/fish-rust/src/flog.rs b/fish-rust/src/flog.rs
index ca60c8f7b..9add0b6cd 100644
--- a/fish-rust/src/flog.rs
+++ b/fish-rust/src/flog.rs
@@ -1,6 +1,7 @@
 use crate::ffi::{get_flog_file_fd, wildcard_match};
 use crate::parse_util::parse_util_unescape_wildcards;
 use crate::wchar::{widestrs, wstr, WString};
+use crate::wchar_ext::WExt;
 use crate::wchar_ffi::WCharToFFI;
 use std::io::Write;
 use std::os::unix::io::{FromRawFd, IntoRawFd, RawFd};
@@ -231,11 +232,11 @@ pub fn activate_flog_categories_by_pattern(wc_ptr: &wstr) {
             *c = '-';
         }
     }
-    for s in wc.as_char_slice().split(|c| *c == ',') {
-        if s.starts_with(&['-']) {
-            apply_one_wildcard(wstr::from_char_slice(&s[1..]), false);
+    for s in wc.split(',') {
+        if s.starts_with('-') {
+            apply_one_wildcard(s.slice_from(1), false);
         } else {
-            apply_one_wildcard(wstr::from_char_slice(s), true);
+            apply_one_wildcard(s, true);
         }
     }
 }
diff --git a/fish-rust/src/wutil/mod.rs b/fish-rust/src/wutil/mod.rs
index 3c6a93f45..752022f43 100644
--- a/fish-rust/src/wutil/mod.rs
+++ b/fish-rust/src/wutil/mod.rs
@@ -12,6 +12,7 @@
 use crate::fds::AutoCloseFd;
 use crate::flog::FLOGF;
 use crate::wchar::{wstr, WString, L};
+use crate::wchar_ext::WExt;
 use crate::wcstringutil::{join_strings, split_string, wcs2string_callback};
 pub(crate) use gettext::{wgettext, wgettext_fmt};
 use libc::{
@@ -202,11 +203,7 @@ pub fn normalize_path(path: &wstr, allow_leading_double_slashes: bool) -> WStrin
         leading_slashes += 1;
     }
 
-    let comps = path
-        .as_char_slice()
-        .split(|&c| c == sep)
-        .map(wstr::from_char_slice)
-        .collect::<Vec<_>>();
+    let comps: Vec<&wstr> = path.split(sep).collect();
     let mut new_comps = Vec::new();
     for comp in comps {
         if comp.is_empty() || comp == "." {