Drop deprecated codegen features

rustler/src/resource/mod.rs

@@ -18,21 +18,3 @@ pub use monitor::Monitor;
 pub use registration::Registration;
 pub use traits::Resource;
 use traits::ResourceExt;
-
-/// Deprecated resource registration method
-///
-/// This macro will create a local `impl Resource` for the passed type and is thus incompatible
-/// with upcoming Rust language changes. Please implement the `Resource` trait directly and
-/// register it either using the `resource_impl` attribute or using the `Env::register` method:
-/// ```ignore
-/// fn on_load(env: Env) -> bool {
-///     env.register::<ResourceType>().is_ok()
-/// }
-/// ```
-#[macro_export]
-macro_rules! resource {
-    ($struct_name:ty, $env: ident) => {{
-        impl $crate::Resource for $struct_name {}
-        $env.register::<$struct_name>().is_ok()
-    }};
-}

rustler_codegen/src/init.rs

@@ -1,50 +1,24 @@
 use proc_macro2::{Span, TokenStream};
-use quote::{quote, quote_spanned};
+use quote::quote;
 use syn::parse::{Parse, ParseStream};
-use syn::spanned::Spanned;
 use syn::{Ident, Result, Token};
 
 #[derive(Debug)]
 pub struct InitMacroInput {
     name: syn::Lit,
     load: TokenStream,
-    maybe_warning: TokenStream,
 }
 
 impl Parse for InitMacroInput {
     fn parse(input: ParseStream) -> Result<Self> {
         let name = syn::Lit::parse(input)?;
 
-        let maybe_warning = if input.peek(syn::token::Comma) && input.peek2(syn::token::Bracket) {
-            // peeked, must be there
-            let _ = syn::token::Comma::parse(input).unwrap();
-            if let Ok(funcs) = syn::ExprArray::parse(input) {
-                quote_spanned!(funcs.span() =>
-                    #[allow(dead_code)]
-                    fn rustler_init() {
-                        #[deprecated(
-                            since = "0.34.0",
-                            note = "Passing NIF functions explicitly is deprecated and this argument is ignored, please remove it"
-                        )]
-                        #[allow(non_upper_case_globals)]
-                        const explicit_nif_functions: () = ();
-                        let _ = explicit_nif_functions;
-                    }
-                )
-            } else {
-                quote!()
-            }
-        } else {
-            quote!()
-        };
-
         let options = parse_expr_assigns(input);
         let load = extract_option(options, "load");
 
         Ok(InitMacroInput {
             name,
-            load,
-            maybe_warning,
+            load
         })
     }
 }
@@ -81,7 +55,6 @@ impl From<InitMacroInput> for proc_macro2::TokenStream {
     fn from(input: InitMacroInput) -> Self {
         let name = input.name;
         let load = input.load;
-        let maybe_warning = input.maybe_warning;
 
         let inner = quote! {
             static mut NIF_ENTRY: Option<rustler::codegen_runtime::DEF_NIF_ENTRY> = None;

rustler_tests/native/rustler_test/src/lib.rs

@@ -19,8 +19,7 @@ mod test_term;
 mod test_thread;
 mod test_tuple;
 
-// Intentional usage of the explicit form (in an "invalid" way, listing a wrong set of functions) to ensure that the warning stays alive
-rustler::init!("Elixir.RustlerTest", [deprecated, usage], load = load);
+rustler::init!("Elixir.RustlerTest", load = load);
 
 fn load(env: rustler::Env, _: rustler::Term) -> bool {
     test_resource::on_load(env)

rustler_tests/native/rustler_test/src/test_resource.rs

@@ -5,6 +5,9 @@ pub struct TestResource {
     test_field: RwLock<i32>,
 }
 
+#[rustler::resource_impl]
+impl Resource for TestResource {}
+
 struct TestMonitorResourceInner {
     mon: Option<Monitor>,
     down_called: bool,
@@ -42,9 +45,7 @@ pub struct WithBinaries {
 impl Resource for WithBinaries {}
 
 pub fn on_load(env: Env) -> bool {
-    rustler::resource!(TestResource, env)
-        && env.register::<WithBinaries>().is_ok()
-        && env.register::<ImmutableResource>().is_ok()
+    env.register::<WithBinaries>().is_ok() && env.register::<ImmutableResource>().is_ok()
 }
 
 #[rustler::nif]