diff --git a/ci/docker/aarch64-linux-android/Dockerfile b/ci/docker/aarch64-linux-android/Dockerfile
index 7b8bdcfdadb32..d6927e5cc80ec 100644
--- a/ci/docker/aarch64-linux-android/Dockerfile
+++ b/ci/docker/aarch64-linux-android/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN dpkg --add-architecture i386
 RUN apt-get update
@@ -8,7 +8,6 @@ RUN apt-get install -y --no-install-recommends \
   wget \
   ca-certificates \
   python3 \
-  python3-distutils \
   unzip \
   expect \
   openjdk-8-jre \
diff --git a/ci/docker/aarch64-unknown-linux-gnu/Dockerfile b/ci/docker/aarch64-unknown-linux-gnu/Dockerfile
index c94a7c63c0ea4..00569ddf22c9b 100644
--- a/ci/docker/aarch64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/aarch64-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,5 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
+
 RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates \
   gcc-aarch64-linux-gnu libc6-dev-arm64-cross qemu-user
diff --git a/ci/docker/aarch64-unknown-linux-musl/Dockerfile b/ci/docker/aarch64-unknown-linux-musl/Dockerfile
index bc15db0692297..fd4c1e28f2525 100644
--- a/ci/docker/aarch64-unknown-linux-musl/Dockerfile
+++ b/ci/docker/aarch64-unknown-linux-musl/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc make libc6-dev git curl ca-certificates \
diff --git a/ci/docker/arm-linux-androideabi/Dockerfile b/ci/docker/arm-linux-androideabi/Dockerfile
index d0fb3176de7e7..9d6a5c9649832 100644
--- a/ci/docker/arm-linux-androideabi/Dockerfile
+++ b/ci/docker/arm-linux-androideabi/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN dpkg --add-architecture i386
 RUN apt-get update
@@ -8,7 +8,6 @@ RUN apt-get install -y --no-install-recommends \
   wget \
   ca-certificates \
   python3 \
-  python3-distutils \
   unzip \
   expect \
   openjdk-8-jre \
diff --git a/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile b/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile
index 977acabf4b6ba..7f75456e1ecfc 100644
--- a/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile
+++ b/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile
@@ -1,4 +1,5 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
+
 RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates \
   gcc-arm-linux-gnueabihf libc6-dev-armhf-cross qemu-user
diff --git a/ci/docker/arm-unknown-linux-musleabihf/Dockerfile b/ci/docker/arm-unknown-linux-musleabihf/Dockerfile
index 1709699997e7f..f13eaab70a189 100644
--- a/ci/docker/arm-unknown-linux-musleabihf/Dockerfile
+++ b/ci/docker/arm-unknown-linux-musleabihf/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc make libc6-dev git curl ca-certificates \
diff --git a/ci/docker/armv7-unknown-linux-uclibceabihf/Dockerfile b/ci/docker/armv7-unknown-linux-uclibceabihf/Dockerfile
index 585fdc35ff542..6a97b1c590bc3 100644
--- a/ci/docker/armv7-unknown-linux-uclibceabihf/Dockerfile
+++ b/ci/docker/armv7-unknown-linux-uclibceabihf/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc libc6-dev qemu-user ca-certificates qemu-system-arm curl \
diff --git a/ci/docker/asmjs-unknown-emscripten/Dockerfile b/ci/docker/asmjs-unknown-emscripten/Dockerfile
index d344cb1368f28..6f2d5ddfc78e1 100644
--- a/ci/docker/asmjs-unknown-emscripten/Dockerfile
+++ b/ci/docker/asmjs-unknown-emscripten/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 # This is a workaround to avoid the interaction with tzdata.
 ENV DEBIAN_FRONTEND=noninteractive
@@ -14,7 +14,6 @@ RUN apt-get install -y --no-install-recommends \
     libc6-dev \
     libxml2 \
     python3 \
-    python3-distutils \
     xz-utils \
     bzip2
 
diff --git a/ci/docker/i686-linux-android/Dockerfile b/ci/docker/i686-linux-android/Dockerfile
index a78c7cb6e8457..0fb48aca342d4 100644
--- a/ci/docker/i686-linux-android/Dockerfile
+++ b/ci/docker/i686-linux-android/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN dpkg --add-architecture i386
 RUN apt-get update
@@ -8,7 +8,6 @@ RUN apt-get install -y --no-install-recommends \
   wget \
   ca-certificates \
   python3 \
-  python3-distutils \
   unzip \
   expect \
   openjdk-8-jre \
diff --git a/ci/docker/i686-unknown-linux-gnu/Dockerfile b/ci/docker/i686-unknown-linux-gnu/Dockerfile
index 6cdc1942c50c7..f50af741db564 100644
--- a/ci/docker/i686-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/i686-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,5 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
+
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc-multilib libc6-dev ca-certificates
diff --git a/ci/docker/i686-unknown-linux-musl/Dockerfile b/ci/docker/i686-unknown-linux-musl/Dockerfile
index a54456fd9942b..7034f9f672500 100644
--- a/ci/docker/i686-unknown-linux-musl/Dockerfile
+++ b/ci/docker/i686-unknown-linux-musl/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN dpkg --add-architecture i386
 RUN apt-get update
diff --git a/ci/docker/loongarch64-unknown-linux-gnu/Dockerfile b/ci/docker/loongarch64-unknown-linux-gnu/Dockerfile
index aebf7c0741956..16b4cf4bfd34e 100644
--- a/ci/docker/loongarch64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/loongarch64-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc libc6-dev qemu-user ca-certificates \
diff --git a/ci/docker/loongarch64-unknown-linux-musl/Dockerfile b/ci/docker/loongarch64-unknown-linux-musl/Dockerfile
index c1219c034c81f..2efd095b0fddd 100644
--- a/ci/docker/loongarch64-unknown-linux-musl/Dockerfile
+++ b/ci/docker/loongarch64-unknown-linux-musl/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         ca-certificates curl gcc git libc6-dev make qemu-user xz-utils
diff --git a/ci/docker/powerpc-unknown-linux-gnu/Dockerfile b/ci/docker/powerpc-unknown-linux-gnu/Dockerfile
index 930f0375db219..a14aa54837de0 100644
--- a/ci/docker/powerpc-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/powerpc-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc libc6-dev qemu-user ca-certificates \
diff --git a/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile b/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile
index b5bf6e90dfbbd..76d8471a63aac 100644
--- a/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc libc6-dev qemu-user ca-certificates \
diff --git a/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile b/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile
index f078a13e7c484..c4c6af25b8684 100644
--- a/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc libc6-dev qemu-user ca-certificates \
diff --git a/ci/docker/riscv64gc-unknown-linux-gnu/Dockerfile b/ci/docker/riscv64gc-unknown-linux-gnu/Dockerfile
index 9ada79ac7273d..0624e2c102055 100644
--- a/ci/docker/riscv64gc-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/riscv64gc-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc libc6-dev qemu-user ca-certificates \
diff --git a/ci/docker/s390x-unknown-linux-gnu/Dockerfile b/ci/docker/s390x-unknown-linux-gnu/Dockerfile
index 70856d78bb879..306d773a61165 100644
--- a/ci/docker/s390x-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/s390x-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \
diff --git a/ci/docker/s390x-unknown-linux-musl/Dockerfile b/ci/docker/s390x-unknown-linux-musl/Dockerfile
index d93eba4bd48e6..d103a1d7488e0 100644
--- a/ci/docker/s390x-unknown-linux-musl/Dockerfile
+++ b/ci/docker/s390x-unknown-linux-musl/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \
diff --git a/ci/docker/sparc64-unknown-linux-gnu/Dockerfile b/ci/docker/sparc64-unknown-linux-gnu/Dockerfile
index ff6810a7fac58..2fcaff80686e1 100644
--- a/ci/docker/sparc64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/sparc64-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:22.04
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \
diff --git a/ci/docker/wasm32-unknown-emscripten/Dockerfile b/ci/docker/wasm32-unknown-emscripten/Dockerfile
index 0e429c055b200..5af38ca5258db 100644
--- a/ci/docker/wasm32-unknown-emscripten/Dockerfile
+++ b/ci/docker/wasm32-unknown-emscripten/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 # This is a workaround to avoid the interaction with tzdata.
 ENV DEBIAN_FRONTEND=noninteractive
@@ -17,7 +17,6 @@ RUN apt-get install -y --no-install-recommends \
     libc6-dev \
     libxml2 \
     python3 \
-    python3-distutils \
     cmake \
     sudo \
     gdb \
diff --git a/ci/docker/wasm32-wasip1/Dockerfile b/ci/docker/wasm32-wasip1/Dockerfile
index e1318151d2e62..68940f4615a7e 100644
--- a/ci/docker/wasm32-wasip1/Dockerfile
+++ b/ci/docker/wasm32-wasip1/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04
+FROM ubuntu:24.10
 
 COPY wasi.sh /
 RUN bash /wasi.sh
diff --git a/ci/docker/wasm32-wasip2/Dockerfile b/ci/docker/wasm32-wasip2/Dockerfile
index c433c491353f9..7abaaf54da02d 100644
--- a/ci/docker/wasm32-wasip2/Dockerfile
+++ b/ci/docker/wasm32-wasip2/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04
+FROM ubuntu:24.10
 
 COPY wasi.sh /
 RUN bash /wasi.sh
diff --git a/ci/docker/x86_64-linux-android/Dockerfile b/ci/docker/x86_64-linux-android/Dockerfile
index d4e87b5f419fc..f6331f10f3897 100644
--- a/ci/docker/x86_64-linux-android/Dockerfile
+++ b/ci/docker/x86_64-linux-android/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
@@ -7,7 +7,6 @@ RUN apt-get update && \
   gcc \
   libc-dev \
   python3 \
-  python3-distutils \
   unzip
 
 WORKDIR /android/
diff --git a/ci/docker/x86_64-unknown-linux-gnu/Dockerfile b/ci/docker/x86_64-unknown-linux-gnu/Dockerfile
index aa5d5e043f9b1..b6ad33ebc7cb5 100644
--- a/ci/docker/x86_64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/x86_64-unknown-linux-gnu/Dockerfile
@@ -1,4 +1,5 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
+
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates linux-headers-generic
diff --git a/ci/docker/x86_64-unknown-linux-gnux32/Dockerfile b/ci/docker/x86_64-unknown-linux-gnux32/Dockerfile
index 6cdc1942c50c7..f50af741db564 100644
--- a/ci/docker/x86_64-unknown-linux-gnux32/Dockerfile
+++ b/ci/docker/x86_64-unknown-linux-gnux32/Dockerfile
@@ -1,4 +1,5 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
+
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc-multilib libc6-dev ca-certificates
diff --git a/ci/docker/x86_64-unknown-linux-musl/Dockerfile b/ci/docker/x86_64-unknown-linux-musl/Dockerfile
index 7b65f5fa2a8c1..11fbd6e1be46a 100644
--- a/ci/docker/x86_64-unknown-linux-musl/Dockerfile
+++ b/ci/docker/x86_64-unknown-linux-musl/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:24.10
 
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
diff --git a/ci/style.sh b/ci/style.sh
index d1b639db5bb89..17a47d037360a 100755
--- a/ci/style.sh
+++ b/ci/style.sh
@@ -14,6 +14,9 @@ rustc ci/style.rs && ./style src
 command -v rustfmt
 rustfmt -V
 
+# Run once to cover everything that isn't in `src/`
+cargo fmt
+
 # Save a list of all source files
 tmpfile="file-list~" # trailing tilde for gitignore
 find src -name '*.rs' > "$tmpfile"
diff --git a/libc-test/build.rs b/libc-test/build.rs
index 9d97705a1444a..5096572088b51 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -3370,13 +3370,14 @@ fn test_linux(target: &str) {
 
     let arm = target.contains("arm");
     let aarch64 = target.contains("aarch64");
+    let i586 = target.contains("i586");
     let i686 = target.contains("i686");
     let ppc = target.contains("powerpc");
     let ppc64 = target.contains("powerpc64");
     let s390x = target.contains("s390x");
     let sparc64 = target.contains("sparc64");
     let x32 = target.contains("x32");
-    let x86_32 = target.contains("i686");
+    let x86_32 = i586 || i686;
     let x86_64 = target.contains("x86_64");
     let aarch64_musl = aarch64 && musl;
     let gnueabihf = target.contains("gnueabihf");
@@ -3385,6 +3386,8 @@ fn test_linux(target: &str) {
     let loongarch64 = target.contains("loongarch64");
     let uclibc = target.contains("uclibc");
 
+    let bit32 = arm || x86_32 || ppc;
+
     let mut cfg = ctest_cfg();
     cfg.define("_GNU_SOURCE", None);
     // This macro re-defines fscanf,scanf,sscanf to link to the symbols that are
@@ -3617,6 +3620,7 @@ fn test_linux(target: &str) {
             // it is only a u64 because we only expose one field
             // http://man7.org/linux/man-pages/man2/epoll_wait.2.html
             "u64" if struct_ == "epoll_event" => "data.u64".to_string(),
+
             // The following structs have a field called `type` in C,
             // but `type` is a Rust keyword, so these fields are translated
             // to `type_` in Rust.
@@ -3834,6 +3838,9 @@ fn test_linux(target: &str) {
             // https://github.com/torvalds/linux/commit/c05cd3645814724bdeb32a2b4d953b12bdea5f8c
             "xdp_umem_reg_v1" => true,
 
+            // FIXME(#3956): our CI now has the more recent version with the extra field.
+            "xdp_umem_reg" => true,
+
             // Is defined in `<linux/sched/types.h>` but if this file is included at the same time
             // as `<sched.h>`, the `struct sched_param` is defined twice, causing the compilation to
             // fail. The problem doesn't seem to be present in more recent versions of the linux
@@ -4295,6 +4302,16 @@ fn test_linux(target: &str) {
             "EPIOCSPARAMS"
             | "EPIOCGPARAMS" => true,
 
+            // FIXME(time): these change value when using 64-bit time on 32-bit
+            "F_GETLK"
+            | "SO_RCVTIMEO"
+            | "SO_SNDTIMEO"
+            | "SO_TIMESTAMP"
+            | "SO_TIMESTAMPNS"
+            | "SO_TIMESTAMPING"
+            | "SCM_TIMESTAMPNS"
+            | "SCM_TIMESTAMPING" if bit32  => true,
+
             _ => false,
         }
     });
@@ -4495,6 +4512,32 @@ fn test_linux(target: &str) {
         (struct_ == "fanotify_event_info_fid" && field == "fsid") ||
         // `handle` is a VLA
         (struct_ == "fanotify_event_info_fid" && field == "handle") ||
+        // FIXME(time): Ubuntu24.04 no longer defines `__WORDSIZE_TIME64_COMPAT32=1`, which
+        // means `ut_session` is now a `long` rather than `int32_t`.
+        (bit32 && (
+            (struct_ == "utmpx" && field == "ut_session") ||
+            (struct_ == "input_event" && field == "time" ) ||
+            // Almost the entire `timex` struct but not everything
+            (struct_ == "timex" && field == "offset") ||
+            (struct_ == "timex" && field == "freq") ||
+            (struct_ == "timex" && field == "maxerror") ||
+            (struct_ == "timex" && field == "esterror") ||
+            (struct_ == "timex" && field == "constant") ||
+            (struct_ == "timex" && field == "precision") ||
+            (struct_ == "timex" && field == "tolerance") ||
+            (struct_ == "timex" && field == "tick") ||
+            (struct_ == "timex" && field == "ppsfreq") ||
+            (struct_ == "timex" && field == "jitter") ||
+            (struct_ == "timex" && field == "stabil") ||
+            (struct_ == "timex" && field == "jitcnt") ||
+            (struct_ == "timex" && field == "calcnt") ||
+            (struct_ == "timex" && field == "errcnt") ||
+            (struct_ == "timex" && field == "stbcnt") ||
+
+            // glibc type depends on `__USE_TIME64_REDIRECTS
+            (struct_ == "timeval" && field == "tv_sec") ||
+            (struct_ == "timeval" && field == "tv_usec") 
+        )) ||
         // invalid application of 'sizeof' to incomplete type 'long unsigned int[]'
         (musl && struct_ == "mcontext_t" && field == "__extcontext" && loongarch64)
     });
diff --git a/src/macros.rs b/src/macros.rs
index 2094f22fcffdd..76f37cce32844 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -197,13 +197,14 @@ macro_rules! e {
 
 // FIXME(ctest): ctest can't handle `const extern` functions, we should be able to remove this
 // cfg completely.
+// FIXME(ctest): ctest can't handle `$(,)?` so we use `$(,)*` which isn't quite correct.
 cfg_if! {
     if #[cfg(feature = "const-extern-fn")] {
         /// Define an `unsafe` function that is const as long as `const-extern-fn` is enabled.
         macro_rules! f {
             ($(
                 $(#[$attr:meta])*
-                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)?) -> $ret:ty
+                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)*) -> $ret:ty
                     $body:block
             )*) => ($(
                 #[inline]
@@ -217,7 +218,7 @@ cfg_if! {
         macro_rules! safe_f {
             ($(
                 $(#[$attr:meta])*
-                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)?) -> $ret:ty
+                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)*) -> $ret:ty
                     $body:block
             )*) => ($(
                 #[inline]
@@ -231,7 +232,7 @@ cfg_if! {
         macro_rules! const_fn {
             ($(
                 $(#[$attr:meta])*
-                $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)?) -> $ret:ty
+                $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)*) -> $ret:ty
                     $body:block
             )*) => ($(
                 #[inline]
@@ -245,7 +246,7 @@ cfg_if! {
         macro_rules! f {
             ($(
                 $(#[$attr:meta])*
-                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)?) -> $ret:ty
+                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)*) -> $ret:ty
                     $body:block
             )*) => ($(
                 #[inline]
@@ -259,7 +260,7 @@ cfg_if! {
         macro_rules! safe_f {
             ($(
                 $(#[$attr:meta])*
-                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)?) -> $ret:ty
+                pub $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)*) -> $ret:ty
                     $body:block
             )*) => ($(
                 #[inline]
@@ -273,7 +274,7 @@ cfg_if! {
         macro_rules! const_fn {
             ($(
                 $(#[$attr:meta])*
-                $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)?) -> $ret:ty
+                $({$constness:ident})* fn $i:ident($($arg:ident: $argty:ty),* $(,)*) -> $ret:ty
                     $body:block
             )*) => ($(
                 #[inline]