update book to rust edition 2024

example-library/build.rs

@@ -17,8 +17,6 @@ fn main() {
 
     println!("cargo:rustc-link-arg=-sEXPORTED_RUNTIME_METHODS=['cwrap','ccall']");
     println!("cargo:rustc-link-arg=-sEXPORT_ES6=1");
-    println!("cargo:rustc-link-arg=-sERROR_ON_UNDEFINED_SYMBOLS=0");
-    println!("cargo:rustc-link-arg=--no-entry");
     println!(
         "cargo:rustc-link-arg=-o{}.js",
         book_output_path

lua-playground/build.rs

@@ -17,7 +17,6 @@ fn main() {
 
     println!("cargo:rustc-link-arg=-sEXPORTED_RUNTIME_METHODS=['cwrap','ccall']");
     println!("cargo:rustc-link-arg=-sEXPORT_ES6=1");
-    println!("cargo:rustc-link-arg=-sERROR_ON_UNDEFINED_SYMBOLS=0");
     println!("cargo:rustc-link-arg=--no-entry");
     println!(
         "cargo:rustc-link-arg=-o{}.js",

src/tutorial/adding-wasm-logic.md

@@ -5,8 +5,8 @@ Adding logic on the wasm / Rust side is very much just like writing a (C compati
 Let's begin simple.
 This function creates a [Lua](https://docs.rs/mlua/latest/mlua/struct.Lua.html) instance and returns the raw pointer to it.
 ```rust,ignore
-#[no_mangle]
+#[unsafe(no_mangle)]
-pub extern "C" fn lua_new() -> *mut mlua::Lua {
+pub unsafe extern "C" fn lua_new() -> *mut mlua::Lua {
     let lua = mlua::Lua::new();
     Box::into_raw(Box::new(lua))
 }
@@ -18,12 +18,12 @@ Now we have a Lua instance, but no way to use it, so let us create one.
 The function takes the pointer to the Lua struct we create in the `new_lua` function, as well as an arbitrary string, which should be lua code, as parameters.
 It then executes this string via the Lua instance and may write to `stderr` if an error occurs.
 ```rust,ignore
-#[no_mangle]
+#[unsafe(no_mangle)]
 pub unsafe extern "C" fn lua_execute(lua: *mut mlua::Lua, to_execute: *const std::ffi::c_char) {
     // casting the raw pointer of the created lua instance back to a usable Rust struct
-    let lua: &mut mlua::Lua = &mut *lua;
+    let lua: &mut mlua::Lua = unsafe { &mut *lua };
     // converting the c string into a `CStr` (which then can be converted to a `String`)
-    let to_execute = std::ffi::CStr::from_ptr(to_execute);
+    let to_execute = unsafe { std::ffi::CStr::from_ptr(to_execute) };
     
     // execute the input code via the lua interpreter
     if let Err(err) = lua.load(&to_execute.to_string_lossy().to_string()).exec() {

src/tutorial/creating-a-project.md

@@ -29,7 +29,7 @@ The `vendored` feature is always required for wasm.
 [package]
 name = "my-project"
 version = "0.1.0"
-edition = "2021"
+edition = "2024"
 
 [dependencies]
 mlua = { version = ">=0.9.3", features = ["lua51", "vendored"] }
@@ -48,7 +48,6 @@ mlua = { version = ">=0.9.3", features = ["lua51", "vendored"] }
 You need to set some additional compiler flags to be able to call your wasm code from Javascript:
 - `-sEXPORTED_RUNTIME_METHODS=['cwrap','ccall']`: this exports the `cwrap` and `ccall` Javascript functions which allows us to call our library methods
 - `-sEXPORT_ES6=1`: this makes the created js glue ES6 compatible. It is not mandatory in general but needed as this tutorial/examples utilizes ES6 imports
-- `-sERROR_ON_UNDEFINED_SYMBOLS=0` (_optional for binary crates_): this ignores undefined symbols. Typically undefined symbols are not really undefined but the linker just can't find them, which is always the case if your crate is a library
 
 > If your package is a library, you have to add some additional options:
 > - `--no-entry`: this defines that the compiled wasm has no main function
@@ -79,7 +78,6 @@ fn main() {
 >     .unwrap()
 >     .join(pkg_name);
 > 
-> println!("cargo:rustc-link-arg=-sERROR_ON_UNDEFINED_SYMBOLS=0");
 > println!("cargo:rustc-link-arg=--no-entry");
 > println!("cargo:rustc-link-arg=-o{}.js", target_path.to_string_lossy());
 > ```