Attempt to mark various generated code with #[automatically_derived]

fixes PyO3#3989

Author: alex

pyo3-macros-backend/src/method.rs

@@ -621,6 +621,7 @@ impl<'a> FnSpec<'a> {
                 let init_holders = holders.init_holders(ctx);
 
                 quote! {
+                    #[automatically_derived]
                     unsafe fn #ident<'py>(
                         py: #pyo3_path::Python<'py>,
                         _slf: *mut #pyo3_path::ffi::PyObject,
@@ -642,6 +643,7 @@ impl<'a> FnSpec<'a> {
                 let check_gil_refs = holders.check_gil_refs();
 
                 quote! {
+                    #[automatically_derived]
                     unsafe fn #ident<'py>(
                         py: #pyo3_path::Python<'py>,
                         _slf: *mut #pyo3_path::ffi::PyObject,
@@ -667,6 +669,7 @@ impl<'a> FnSpec<'a> {
                 let check_gil_refs = holders.check_gil_refs();
 
                 quote! {
+                    #[automatically_derived]
                     unsafe fn #ident<'py>(
                         py: #pyo3_path::Python<'py>,
                         _slf: *mut #pyo3_path::ffi::PyObject,
@@ -693,6 +696,7 @@ impl<'a> FnSpec<'a> {
                 let init_holders = holders.init_holders(ctx);
                 let check_gil_refs = holders.check_gil_refs();
                 quote! {
+                    #[automatically_derived]
                     unsafe fn #ident(
                         py: #pyo3_path::Python<'_>,
                         _slf: *mut #pyo3_path::ffi::PyTypeObject,

pyo3-macros-backend/src/pyclass.rs

@@ -1301,10 +1301,12 @@ fn impl_pytypeinfo(
 
     quote! {
         #[allow(deprecated)]
+        #[automatically_derived]
         unsafe impl #pyo3_path::type_object::HasPyGilRef for #cls {
             type AsRefTarget = #pyo3_path::PyCell<Self>;
         }
 
+        #[automatically_derived]
         unsafe impl #pyo3_path::type_object::PyTypeInfo for #cls {
             const NAME: &'static str = #cls_name;
             const MODULE: ::std::option::Option<&'static str> = #module;

src/exceptions.rs

@@ -103,6 +103,7 @@ macro_rules! import_exception {
             #module=::std::option::Option::Some(stringify!($module))
         );
 
+        #[automatically_derived]
         impl $name {
             fn type_object_raw(py: $crate::Python<'_>) -> *mut $crate::ffi::PyTypeObject {
                 use $crate::sync::GILOnceCell;