diff --git a/mlua-sys/src/lib.rs b/mlua-sys/src/lib.rs
index 6bbb595..730bf37 100644
--- a/mlua-sys/src/lib.rs
+++ b/mlua-sys/src/lib.rs
@@ -1,7 +1,8 @@
 //! Low level bindings to Lua 5.4/5.3/5.2/5.1 (including LuaJIT) and Luau.
 
-#![allow(non_camel_case_types, non_snake_case, dead_code)]
+#![allow(non_camel_case_types, non_snake_case)]
 #![allow(clippy::missing_safety_doc)]
+#![allow(unsafe_op_in_unsafe_fn)]
 #![doc(test(attr(deny(warnings))))]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
diff --git a/mlua-sys/src/lua51/lauxlib.rs b/mlua-sys/src/lua51/lauxlib.rs
index 78cef29..b80b45f 100644
--- a/mlua-sys/src/lua51/lauxlib.rs
+++ b/mlua-sys/src/lua51/lauxlib.rs
@@ -18,7 +18,7 @@ pub struct luaL_Reg {
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_register(L: *mut lua_State, libname: *const c_char, l: *const luaL_Reg);
     #[link_name = "luaL_getmetafield"]
     pub fn luaL_getmetafield_(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -61,7 +61,7 @@ pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 
diff --git a/mlua-sys/src/lua51/lua.rs b/mlua-sys/src/lua51/lua.rs
index adbcd30..e47acd3 100644
--- a/mlua-sys/src/lua51/lua.rs
+++ b/mlua-sys/src/lua51/lua.rs
@@ -90,7 +90,7 @@ pub type lua_Alloc =
     unsafe extern "C" fn(ud: *mut c_void, ptr: *mut c_void, osize: usize, nsize: usize) -> *mut c_void;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // State manipulation
     //
@@ -220,7 +220,7 @@ pub const LUA_GCSETPAUSE: c_int = 6;
 pub const LUA_GCSETSTEPMUL: c_int = 7;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
@@ -228,7 +228,7 @@ extern "C-unwind" {
 // Miscellaneous functions
 //
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     #[link_name = "lua_error"]
     fn lua_error_(L: *mut lua_State) -> c_int;
     pub fn lua_next(L: *mut lua_State, idx: c_int) -> c_int;
@@ -370,7 +370,7 @@ pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;
diff --git a/mlua-sys/src/lua51/lualib.rs b/mlua-sys/src/lua51/lualib.rs
index de994ce..3ed0242 100644
--- a/mlua-sys/src/lua51/lualib.rs
+++ b/mlua-sys/src/lua51/lualib.rs
@@ -21,7 +21,7 @@ pub const LUA_JITLIBNAME: *const c_char = cstr!("jit");
 pub const LUA_FFILIBNAME: *const c_char = cstr!("ffi");
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua51", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;
     pub fn luaopen_io(L: *mut lua_State) -> c_int;
diff --git a/mlua-sys/src/lua52/lauxlib.rs b/mlua-sys/src/lua52/lauxlib.rs
index fad19eb..b4611d9 100644
--- a/mlua-sys/src/lua52/lauxlib.rs
+++ b/mlua-sys/src/lua52/lauxlib.rs
@@ -21,7 +21,7 @@ pub struct luaL_Reg {
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number);
 
     #[link_name = "luaL_getmetafield"]
@@ -69,7 +69,7 @@ pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 
@@ -82,7 +82,7 @@ pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_loadbufferx(
         L: *mut lua_State,
         buff: *const c_char,
diff --git a/mlua-sys/src/lua52/lua.rs b/mlua-sys/src/lua52/lua.rs
index a5fed2b..e5239ce 100644
--- a/mlua-sys/src/lua52/lua.rs
+++ b/mlua-sys/src/lua52/lua.rs
@@ -95,7 +95,7 @@ pub type lua_Alloc =
     unsafe extern "C" fn(ud: *mut c_void, ptr: *mut c_void, osize: usize, nsize: usize) -> *mut c_void;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // State manipulation
     //
@@ -161,14 +161,14 @@ pub const LUA_OPLT: c_int = 1;
 pub const LUA_OPLE: c_int = 2;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_arith(L: *mut lua_State, op: c_int);
     pub fn lua_rawequal(L: *mut lua_State, idx1: c_int, idx2: c_int) -> c_int;
     pub fn lua_compare(L: *mut lua_State, idx1: c_int, idx2: c_int, op: c_int) -> c_int;
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Push functions (C -> stack)
     //
@@ -257,7 +257,7 @@ pub unsafe fn lua_pcall(L: *mut lua_State, n: c_int, r: c_int, f: c_int) -> c_in
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Coroutine functions
     //
@@ -289,12 +289,12 @@ pub const LUA_GCGEN: c_int = 10;
 pub const LUA_GCINC: c_int = 11;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Miscellaneous functions
     //
@@ -448,7 +448,7 @@ pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;
diff --git a/mlua-sys/src/lua52/lualib.rs b/mlua-sys/src/lua52/lualib.rs
index a9ed21f..1b3c844 100644
--- a/mlua-sys/src/lua52/lualib.rs
+++ b/mlua-sys/src/lua52/lualib.rs
@@ -15,7 +15,7 @@ pub const LUA_DBLIBNAME: *const c_char = cstr!("debug");
 pub const LUA_LOADLIBNAME: *const c_char = cstr!("package");
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua52", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;
diff --git a/mlua-sys/src/lua53/lauxlib.rs b/mlua-sys/src/lua53/lauxlib.rs
index 53c45bd..959c636 100644
--- a/mlua-sys/src/lua53/lauxlib.rs
+++ b/mlua-sys/src/lua53/lauxlib.rs
@@ -21,7 +21,7 @@ pub struct luaL_Reg {
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: usize);
 
     pub fn luaL_getmetafield(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -65,7 +65,7 @@ pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 
@@ -78,7 +78,7 @@ pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_loadbufferx(
         L: *mut lua_State,
         buff: *const c_char,
diff --git a/mlua-sys/src/lua53/lua.rs b/mlua-sys/src/lua53/lua.rs
index efb85f0..2729fdc 100644
--- a/mlua-sys/src/lua53/lua.rs
+++ b/mlua-sys/src/lua53/lua.rs
@@ -102,7 +102,7 @@ pub type lua_Alloc =
     unsafe extern "C" fn(ud: *mut c_void, ptr: *mut c_void, osize: usize, nsize: usize) -> *mut c_void;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // State manipulation
     //
@@ -172,14 +172,14 @@ pub const LUA_OPLT: c_int = 1;
 pub const LUA_OPLE: c_int = 2;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_arith(L: *mut lua_State, op: c_int);
     pub fn lua_rawequal(L: *mut lua_State, idx1: c_int, idx2: c_int) -> c_int;
     pub fn lua_compare(L: *mut lua_State, idx1: c_int, idx2: c_int, op: c_int) -> c_int;
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Push functions (C -> stack)
     //
@@ -265,7 +265,7 @@ pub unsafe fn lua_pcall(L: *mut lua_State, n: c_int, r: c_int, f: c_int) -> c_in
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Coroutine functions
     //
@@ -300,12 +300,12 @@ pub const LUA_GCSETSTEPMUL: c_int = 7;
 pub const LUA_GCISRUNNING: c_int = 9;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Miscellaneous functions
     //
@@ -477,7 +477,7 @@ pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;
diff --git a/mlua-sys/src/lua53/lualib.rs b/mlua-sys/src/lua53/lualib.rs
index 0b556d4..c29d816 100644
--- a/mlua-sys/src/lua53/lualib.rs
+++ b/mlua-sys/src/lua53/lualib.rs
@@ -16,7 +16,7 @@ pub const LUA_DBLIBNAME: *const c_char = cstr!("debug");
 pub const LUA_LOADLIBNAME: *const c_char = cstr!("package");
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua53", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;
diff --git a/mlua-sys/src/lua54/lauxlib.rs b/mlua-sys/src/lua54/lauxlib.rs
index 8a1fd12..9c3de5b 100644
--- a/mlua-sys/src/lua54/lauxlib.rs
+++ b/mlua-sys/src/lua54/lauxlib.rs
@@ -21,7 +21,7 @@ pub struct luaL_Reg {
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: usize);
 
     pub fn luaL_getmetafield(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -64,7 +64,7 @@ pub const LUA_NOREF: c_int = -2;
 pub const LUA_REFNIL: c_int = -1;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
     pub fn luaL_unref(L: *mut lua_State, t: c_int, r#ref: c_int);
 
@@ -77,7 +77,7 @@ pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_loadbufferx(
         L: *mut lua_State,
         buff: *const c_char,
diff --git a/mlua-sys/src/lua54/lua.rs b/mlua-sys/src/lua54/lua.rs
index 09c7c6a..15a3044 100644
--- a/mlua-sys/src/lua54/lua.rs
+++ b/mlua-sys/src/lua54/lua.rs
@@ -104,7 +104,7 @@ pub type lua_Alloc =
 pub type lua_WarnFunction = unsafe extern "C-unwind" fn(ud: *mut c_void, msg: *const c_char, tocont: c_int);
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // State manipulation
     //
@@ -186,14 +186,14 @@ pub const LUA_OPLT: c_int = 1;
 pub const LUA_OPLE: c_int = 2;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_arith(L: *mut lua_State, op: c_int);
     pub fn lua_rawequal(L: *mut lua_State, idx1: c_int, idx2: c_int) -> c_int;
     pub fn lua_compare(L: *mut lua_State, idx1: c_int, idx2: c_int, op: c_int) -> c_int;
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Push functions (C -> stack)
     //
@@ -279,7 +279,7 @@ pub unsafe fn lua_pcall(L: *mut lua_State, n: c_int, r: c_int, f: c_int) -> c_in
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Coroutine functions
     //
@@ -303,7 +303,7 @@ pub unsafe fn lua_yield(L: *mut lua_State, n: c_int) -> c_int {
 // Warning-related functions
 //
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_setwarnf(L: *mut lua_State, f: Option<lua_WarnFunction>, ud: *mut c_void);
     pub fn lua_warning(L: *mut lua_State, msg: *const c_char, tocont: c_int);
 }
@@ -324,12 +324,12 @@ pub const LUA_GCGEN: c_int = 10;
 pub const LUA_GCINC: c_int = 11;
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, ...) -> c_int;
 }
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // Miscellaneous functions
     //
@@ -519,7 +519,7 @@ pub const LUA_MASKCOUNT: c_int = 1 << (LUA_HOOKCOUNT as usize);
 pub type lua_Hook = unsafe extern "C-unwind" fn(L: *mut lua_State, ar: *mut lua_Debug);
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_getstack(L: *mut lua_State, level: c_int, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getlocal(L: *mut lua_State, ar: *const lua_Debug, n: c_int) -> *const c_char;
diff --git a/mlua-sys/src/lua54/lualib.rs b/mlua-sys/src/lua54/lualib.rs
index dec577b..0f66664 100644
--- a/mlua-sys/src/lua54/lualib.rs
+++ b/mlua-sys/src/lua54/lualib.rs
@@ -15,7 +15,7 @@ pub const LUA_DBLIBNAME: *const c_char = cstr!("debug");
 pub const LUA_LOADLIBNAME: *const c_char = cstr!("package");
 
 #[cfg_attr(all(windows, raw_dylib), link(name = "lua54", kind = "raw-dylib"))]
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;
diff --git a/mlua-sys/src/luau/compat.rs b/mlua-sys/src/luau/compat.rs
index 4121293..f4c39ea 100644
--- a/mlua-sys/src/luau/compat.rs
+++ b/mlua-sys/src/luau/compat.rs
@@ -368,7 +368,7 @@ pub unsafe fn luaL_loadbufferenv(
     mode: *const c_char,
     mut env: c_int,
 ) -> c_int {
-    extern "C" {
+    unsafe extern "C" {
         fn free(p: *mut c_void);
     }
 
diff --git a/mlua-sys/src/luau/lauxlib.rs b/mlua-sys/src/luau/lauxlib.rs
index 845bb28..5aabf03 100644
--- a/mlua-sys/src/luau/lauxlib.rs
+++ b/mlua-sys/src/luau/lauxlib.rs
@@ -3,7 +3,7 @@
 use std::os::raw::{c_char, c_float, c_int, c_void};
 use std::ptr;
 
-use super::lua::{self, lua_CFunction, lua_Number, lua_State, lua_Unsigned, LUA_REGISTRYINDEX};
+use super::lua::{self, LUA_REGISTRYINDEX, lua_CFunction, lua_Number, lua_State, lua_Unsigned};
 
 #[repr(C)]
 pub struct luaL_Reg {
@@ -11,7 +11,7 @@ pub struct luaL_Reg {
     pub func: lua_CFunction,
 }
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_register(L: *mut lua_State, libname: *const c_char, l: *const luaL_Reg);
     #[link_name = "luaL_getmetafield"]
     pub fn luaL_getmetafield_(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
@@ -182,7 +182,7 @@ pub struct luaL_Strbuf {
 // For compatibility
 pub type luaL_Buffer = luaL_Strbuf;
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaL_buffinit(L: *mut lua_State, B: *mut luaL_Strbuf);
     pub fn luaL_buffinitsize(L: *mut lua_State, B: *mut luaL_Strbuf, size: usize) -> *mut c_char;
     pub fn luaL_prepbuffsize(B: *mut luaL_Strbuf, size: usize) -> *mut c_char;
diff --git a/mlua-sys/src/luau/lua.rs b/mlua-sys/src/luau/lua.rs
index 017ea66..8a55eef 100644
--- a/mlua-sys/src/luau/lua.rs
+++ b/mlua-sys/src/luau/lua.rs
@@ -12,10 +12,10 @@ pub const LUA_MULTRET: c_int = -1;
 const LUAI_MAXCSTACK: c_int = 1000000;
 
 // Number of valid Lua userdata tags
-const LUA_UTAG_LIMIT: c_int = 128;
+pub const LUA_UTAG_LIMIT: c_int = 128;
 
 // Number of valid Lua lightuserdata tags
-const LUA_LUTAG_LIMIT: c_int = 128;
+pub const LUA_LUTAG_LIMIT: c_int = 128;
 
 //
 // Pseudo-indices
@@ -95,7 +95,7 @@ pub const fn luau_version() -> Option<&'static str> {
     option_env!("LUAU_VERSION")
 }
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     //
     // State manipulation
     //
@@ -264,14 +264,14 @@ pub const LUA_GCSETGOAL: c_int = 7;
 pub const LUA_GCSETSTEPMUL: c_int = 8;
 pub const LUA_GCSETSTEPSIZE: c_int = 9;
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_gc(L: *mut lua_State, what: c_int, data: c_int) -> c_int;
 }
 
 //
 // Memory statistics
 //
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_setmemcat(L: *mut lua_State, category: c_int);
     pub fn lua_totalbytes(L: *mut lua_State, category: c_int) -> usize;
 }
@@ -279,7 +279,7 @@ extern "C-unwind" {
 //
 // Miscellaneous functions
 //
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_error(L: *mut lua_State) -> !;
     pub fn lua_next(L: *mut lua_State, idx: c_int) -> c_int;
     pub fn lua_rawiter(L: *mut lua_State, idx: c_int, iter: c_int) -> c_int;
@@ -304,7 +304,7 @@ extern "C-unwind" {
 pub const LUA_NOREF: c_int = -1;
 pub const LUA_REFNIL: c_int = 0;
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_ref(L: *mut lua_State, idx: c_int) -> c_int;
     pub fn lua_unref(L: *mut lua_State, r#ref: c_int);
 }
@@ -470,7 +470,7 @@ pub type lua_Coverage = unsafe extern "C-unwind" fn(
     size: usize,
 );
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn lua_stackdepth(L: *mut lua_State) -> c_int;
     pub fn lua_getinfo(L: *mut lua_State, level: c_int, what: *const c_char, ar: *mut lua_Debug) -> c_int;
     pub fn lua_getargument(L: *mut lua_State, level: c_int, n: c_int) -> c_int;
@@ -536,12 +536,12 @@ pub struct lua_Callbacks {
     pub onallocate: Option<unsafe extern "C-unwind" fn(L: *mut lua_State, osize: usize, nsize: usize)>,
 }
 
-extern "C" {
+unsafe extern "C" {
     pub fn lua_callbacks(L: *mut lua_State) -> *mut lua_Callbacks;
 }
 
 // Functions from customization lib
-extern "C" {
+unsafe extern "C" {
     pub fn luau_setfflag(name: *const c_char, value: c_int) -> c_int;
     pub fn lua_getmetatablepointer(L: *mut lua_State, idx: c_int) -> *const c_void;
 }
diff --git a/mlua-sys/src/luau/luacode.rs b/mlua-sys/src/luau/luacode.rs
index 425f2d2..cd7ec37 100644
--- a/mlua-sys/src/luau/luacode.rs
+++ b/mlua-sys/src/luau/luacode.rs
@@ -76,7 +76,7 @@ pub type lua_LibraryMemberConstantCallback = unsafe extern "C-unwind" fn(
     constant: *mut lua_CompileConstant,
 );
 
-extern "C" {
+unsafe extern "C" {
     pub fn luau_set_compile_constant_nil(cons: *mut lua_CompileConstant);
     pub fn luau_set_compile_constant_boolean(cons: *mut lua_CompileConstant, b: c_int);
     pub fn luau_set_compile_constant_number(cons: *mut lua_CompileConstant, n: f64);
@@ -84,7 +84,7 @@ extern "C" {
     pub fn luau_set_compile_constant_string(cons: *mut lua_CompileConstant, s: *const c_char, l: usize);
 }
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     #[link_name = "luau_compile"]
     pub fn luau_compile_(
         source: *const c_char,
@@ -94,7 +94,7 @@ extern "C-unwind" {
     ) -> *mut c_char;
 }
 
-extern "C" {
+unsafe extern "C" {
     fn free(p: *mut c_void);
 }
 
diff --git a/mlua-sys/src/luau/luacodegen.rs b/mlua-sys/src/luau/luacodegen.rs
index ebbddc9..9e063ed 100644
--- a/mlua-sys/src/luau/luacodegen.rs
+++ b/mlua-sys/src/luau/luacodegen.rs
@@ -4,7 +4,7 @@ use std::os::raw::c_int;
 
 use super::lua::lua_State;
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luau_codegen_supported() -> c_int;
     pub fn luau_codegen_create(state: *mut lua_State);
     pub fn luau_codegen_compile(state: *mut lua_State, idx: c_int);
diff --git a/mlua-sys/src/luau/lualib.rs b/mlua-sys/src/luau/lualib.rs
index 834f09e..a28a2a6 100644
--- a/mlua-sys/src/luau/lualib.rs
+++ b/mlua-sys/src/luau/lualib.rs
@@ -15,7 +15,7 @@ pub const LUA_MATHLIBNAME: *const c_char = cstr!("math");
 pub const LUA_DBLIBNAME: *const c_char = cstr!("debug");
 pub const LUA_VECLIBNAME: *const c_char = cstr!("vector");
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     pub fn luaopen_base(L: *mut lua_State) -> c_int;
     pub fn luaopen_coroutine(L: *mut lua_State) -> c_int;
     pub fn luaopen_table(L: *mut lua_State) -> c_int;
diff --git a/mlua-sys/src/luau/luarequire.rs b/mlua-sys/src/luau/luarequire.rs
index dcdd0b8..7225cb9 100644
--- a/mlua-sys/src/luau/luarequire.rs
+++ b/mlua-sys/src/luau/luarequire.rs
@@ -117,7 +117,7 @@ pub struct luarequire_Configuration {
 // Populates function pointers in the given luarequire_Configuration.
 pub type luarequire_Configuration_init = unsafe extern "C" fn(config: *mut luarequire_Configuration);
 
-extern "C-unwind" {
+unsafe extern "C-unwind" {
     // Initializes and pushes the require closure onto the stack without registration.
     pub fn luarequire_pushrequire(
         L: *mut lua_State,