diff --git a/Cargo.toml b/Cargo.toml
index 933c72a572..25fcd2da5e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,6 +30,7 @@ zero_ptr = "warn" # must allow on public constants due to cbindgen issue
 
 [workspace.lints.rust]
 dangling_pointers_from_temporaries = "deny"
+internal_features = "allow" # core_intrinsics and lang_items
 irrefutable_let_patterns = "deny"
 mismatched_lifetime_syntaxes = "deny"
 non_camel_case_types = "allow"
diff --git a/src/header/locale/mod.rs b/src/header/locale/mod.rs
index 34bbe74448..98bd4b34cf 100644
--- a/src/header/locale/mod.rs
+++ b/src/header/locale/mod.rs
@@ -166,7 +166,7 @@ pub unsafe extern "C" fn duplocale(loc: locale_t) -> locale_t {
     }
 }
 
-pub fn load_locale_file(name: &str) -> Result<Box<LocaleData>, Errno> {
+pub(crate) fn load_locale_file(name: &str) -> Result<Box<LocaleData>, Errno> {
     let mut path = String::from("/usr/share/i18n/locales/");
     path.push_str(name);
 
diff --git a/src/header/sys_syslog/logger.rs b/src/header/sys_syslog/logger.rs
index c16a0f0ba3..1a004f05c5 100644
--- a/src/header/sys_syslog/logger.rs
+++ b/src/header/sys_syslog/logger.rs
@@ -30,7 +30,7 @@ use super::{
 
 pub(super) static LOGGER: Mutex<LogParams<LogFile>> = Mutex::new(LogParams::new(None));
 
-pub struct LogParams<L: LogSink> {
+pub(super) struct LogParams<L: LogSink> {
     /// Identity prepended to each log message. POSIX does not specific what to do when it's empty,
     /// but the program name is a common default.
     ident: String,
diff --git a/src/header/sys_utsname/mod.rs b/src/header/sys_utsname/mod.rs
index f9031c7b95..49653883e1 100644
--- a/src/header/sys_utsname/mod.rs
+++ b/src/header/sys_utsname/mod.rs
@@ -15,7 +15,7 @@ pub const UTSLENGTH: usize = 65;
 
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_utsname.h.html>.
 #[repr(C)]
-#[derive(Clone, Copy, Debug, OutProject)]
+#[derive(Clone, Debug, OutProject)]
 pub struct utsname {
     pub sysname: [c_char; UTSLENGTH],
     pub nodename: [c_char; UTSLENGTH],
diff --git a/src/header/unistd/mod.rs b/src/header/unistd/mod.rs
index d64255d128..4e3e6a95f9 100644
--- a/src/header/unistd/mod.rs
+++ b/src/header/unistd/mod.rs
@@ -115,17 +115,6 @@ pub const _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS: c_int = 1145;
 pub const _CS_POSIX_V7_LPBIG_OFFBIG_LIBS: c_int = 1146;
 pub const _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS: c_int = 1147;
 
-// Re-exported from pthread.h. `pthread_atfork` should be in pthread.h according to the
-// standard, but glibc exports it here as well. We ONLY exported it in unistd.h till recently.
-unsafe extern "C" {
-    #[unsafe(no_mangle)]
-    pub fn pthread_atfork(
-        prepare: Option<extern "C" fn()>,
-        parent: Option<extern "C" fn()>,
-        child: Option<extern "C" fn()>,
-    ) -> c_int;
-}
-
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/fork.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn _Fork() -> pid_t {
@@ -583,7 +572,6 @@ pub unsafe extern "C" fn gethostname(mut name: *mut c_char, mut len: size_t) ->
         .map(|()| 0)
         .or_minus_one_errno();
     if err < 0 {
-        mem::forget(uts);
         return err;
     }
     for c in unsafe { uts.assume_init() }.nodename.iter() {
diff --git a/src/platform/allocator/mod.rs b/src/platform/allocator/mod.rs
index 002c6082a1..e6c9244a35 100644
--- a/src/platform/allocator/mod.rs
+++ b/src/platform/allocator/mod.rs
@@ -75,14 +75,12 @@ unsafe impl GlobalAlloc for Allocator {
             let new =
                 unsafe { self.alloc(Layout::from_size_align_unchecked(new_size, layout.align())) };
             let old_size = layout.size();
-            let old_align = layout.align();
 
             if !new.is_null() {
                 let size = cmp::min(old_size, new_size);
                 unsafe { copy_nonoverlapping(ptr, new, size) };
             }
 
-            drop((old_size, old_align));
             unsafe { (*self.get()).lock().free(ptr) };
 
             new
diff --git a/src/platform/allocator/sys.rs b/src/platform/allocator/sys.rs
index fc7bb572b3..ff01eea87b 100644
--- a/src/platform/allocator/sys.rs
+++ b/src/platform/allocator/sys.rs
@@ -1,7 +1,7 @@
 use crate::{
     header::{
+        pthread::pthread_atfork,
         sys_mman::{self, MREMAP_MAYMOVE},
-        unistd::pthread_atfork,
     },
     platform::{Pal, Sys},
     sync::Mutex,
diff --git a/src/pthread/mod.rs b/src/pthread/mod.rs
index cc21330dc3..0f39be3772 100644
--- a/src/pthread/mod.rs
+++ b/src/pthread/mod.rs
@@ -190,7 +190,7 @@ pub(crate) unsafe fn create(
         push(arg as usize);
         push(start_routine as usize);
 
-        push(new_thread_shim as usize);
+        push(new_thread_shim as *const () as usize);
     }
 
     let Ok(os_tid) = (unsafe { Sys::rlct_clone(stack, &mut new_tcb.os_specific) }) else {
diff --git a/tests/unistd/fork.c b/tests/unistd/fork.c
index eb9b84ac2d..225ead36e2 100644
--- a/tests/unistd/fork.c
+++ b/tests/unistd/fork.c
@@ -1,3 +1,4 @@
+#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>