Release 4.3.1

Created by ./build_tools/release.sh 4.3.1

CHANGELOG.rst

@@ -1,3 +1,10 @@
+fish 4.3.1 (released December 28, 2025)
+=======================================
+
+This release fixes the following problem identified in 4.3.0:
+
+- Possible crash after expanding an abbreviation (:issue:`12223`).
+
 fish 4.3.0 (released December 28, 2025)
 =======================================
 

Cargo.lock

@@ -152,7 +152,7 @@ checksum = "52051878f80a721bb68ebfbc930e07b65ba72f2da88968ea5c06fd6ca3d3a127"
 
 [[package]]
 name = "fish"
-version = "4.3.0"
+version = "4.3.1"
 dependencies = [
  "bitflags",
  "cc",

Cargo.toml

@@ -79,7 +79,7 @@ debug = true
 
 [package]
 name = "fish"
-version = "4.3.0"
+version = "4.3.1"
 edition.workspace = true
 rust-version.workspace = true
 default-run = "fish"

build_tools/release.sh

@@ -86,9 +86,10 @@ sed -i \
 CommitVersion() {
     sed -i "s/^version = \".*\"/version = \"$1\"/g" Cargo.toml
     cargo fetch --offline
-    # debchange is a Debian script to manage the Debian changelog, but
+    if [ "$1" = "$version" ]; then
-    # it's too annoying to install everywhere. Just do it by hand.
+        # debchange is a Debian script to manage the Debian changelog, but
-    cat - contrib/debian/changelog > contrib/debian/changelog.new <<EOF
+        # it's too annoying to install everywhere. Just do it by hand.
+        cat - contrib/debian/changelog > contrib/debian/changelog.new <<EOF
 fish (${version}-1) stable; urgency=medium
 
   * Release of new version $version.
@@ -98,8 +99,10 @@ fish (${version}-1) stable; urgency=medium
  -- $committer  $(date -R)
 
 EOF
-    mv contrib/debian/changelog.new contrib/debian/changelog
+        mv contrib/debian/changelog.new contrib/debian/changelog
-    git add CHANGELOG.rst Cargo.toml Cargo.lock contrib/debian/changelog
+        git add contrib/debian/changelog
+    fi
+    git add CHANGELOG.rst Cargo.toml Cargo.lock
     git commit -m "$2
 
 Created by ./build_tools/release.sh $version"
@@ -296,6 +299,8 @@ milestone_number() {
 gh_api_repo milestones/"$(milestone_number "$milestone_version")" \
     --method PATCH --raw-field state=closed
 
+next_minor_version=$(echo "$minor_version" |
+    awk -F. '{ printf "%s.%s", $1, $2+1 }')
 if [ -z "$(milestone_number "$next_minor_version")" ]; then
     gh_api_repo milestones --method POST \
         --raw-field title="fish $next_minor_version"

contrib/debian/changelog

@@ -1,3 +1,11 @@
+fish (4.3.1-1) stable; urgency=medium
+
+  * Release of new version 4.3.1.
+
+  See https://github.com/fish-shell/fish-shell/releases/tag/4.3.1 for details.
+
+ -- Johannes Altmanninger <aclopte@gmail.com>  Sun, 28 Dec 2025 16:54:44 +0100
+
 fish (4.3.0-1) stable; urgency=medium
 
   * Release of new version 4.3.0.

src/wcstringutil.rs

@@ -19,11 +19,25 @@ pub fn count_newlines(s: &wstr) -> usize {
     count
 }
 
+fn is_prefix(mut lhs: impl Iterator<Item = char>, mut rhs: impl Iterator<Item = char>) -> bool {
+    loop {
+        match (lhs.next(), rhs.next()) {
+            (None, _) => return true,
+            (Some(_), None) => return false,
+            (Some(lhs), Some(rhs)) => {
+                if lhs != rhs {
+                    return false;
+                }
+            }
+        }
+    }
+}
+
 /// Test if a string prefixes another without regard to case. Returns true if a is a prefix of b.
 pub fn string_prefixes_string_case_insensitive(proposed_prefix: &wstr, value: &wstr) -> bool {
-    let mut proposed_prefix = lowercase(proposed_prefix.chars());
+    let proposed_prefix = lowercase(proposed_prefix.chars());
     let value = lowercase(value.chars());
-    proposed_prefix.by_ref().zip(value).all(|(a, b)| a == b) && proposed_prefix.next().is_none()
+    is_prefix(proposed_prefix, value)
 }
 
 pub fn string_prefixes_string_maybe_case_insensitive(
@@ -48,9 +62,9 @@ pub fn strip_executable_suffix(path: &wstr) -> Option<&wstr> {
 
 /// Test if a string is a suffix of another.
 pub fn string_suffixes_string_case_insensitive(proposed_suffix: &wstr, value: &wstr) -> bool {
-    let mut proposed_suffix = lowercase_rev(proposed_suffix.chars());
+    let proposed_suffix = lowercase_rev(proposed_suffix.chars());
     let value = lowercase_rev(value.chars());
-    proposed_suffix.by_ref().zip(value).all(|(a, b)| a == b) && proposed_suffix.next().is_none()
+    is_prefix(proposed_suffix, value)
 }
 
 /// Test if a string prefixes another. Returns true if a is a prefix of b.
@@ -573,6 +587,8 @@ macro_rules! validate {
         validate!("İ", "i\u{307}_", true);
         validate!("i\u{307}", "İ", true); // prefix is longer
         validate!("i", "İ", true);
+        validate!("gs", "gs_", true);
+        validate!("gs_", "gs", false);
     }
 
     #[test]
@@ -590,6 +606,8 @@ macro_rules! validate {
         validate!("İ", "i\u{307}", true); // suffix is longer
         validate!("İ", "_İ", true);
         validate!("i", "_İ", false);
+        validate!("gs", "_gs", true);
+        validate!("_gs ", "gs", false);
     }
 
     #[test]