expand/resolve: Turn #[derive] into a regular macro attribute

compiler/rustc_builtin_macros/src/lib.rs

@@ -27,6 +27,7 @@ mod cfg_accessible;
 mod compile_error;
 mod concat;
 mod concat_idents;
+mod derive;
 mod deriving;
 mod env;
 mod format;
@@ -88,6 +89,7 @@ pub fn register_builtin_macros(resolver: &mut dyn ResolverExpand) {
     register_attr! {
         bench: test::expand_bench,
         cfg_accessible: cfg_accessible::Expander,
+        derive: derive::Expander,
         global_allocator: global_allocator::expand,
         test: test::expand_test,
         test_case: test::expand_test_case,