diff --git a/pyo3-derive-backend/src/py_impl.rs b/pyo3-derive-backend/src/py_impl.rs
index c53ac69b..f3b07e60 100644
--- a/pyo3-derive-backend/src/py_impl.rs
+++ b/pyo3-derive-backend/src/py_impl.rs
@@ -19,7 +19,7 @@ pub fn build_py_methods(ast: &mut syn::Item) -> Tokens {
     }
 }
 
-fn impl_methods(ty: &Box<syn::Ty>, impls: &mut Vec<syn::ImplItem>) -> Tokens {
+pub fn impl_methods(ty: &Box<syn::Ty>, impls: &mut Vec<syn::ImplItem>) -> Tokens {
 
     // get method names in impl block
     let mut methods = Vec::new();
diff --git a/src/conversion.rs b/src/conversion.rs
index 37165e96..86e3d0ed 100644
--- a/src/conversion.rs
+++ b/src/conversion.rs
@@ -309,12 +309,12 @@ impl<T> PyTryFrom for T where T: PyTypeInfo {
 /// whether a return type is a (possibly aliased) PyResult or not. It is also quite handy because
 /// the codegen is currently built on the assumption that all functions return a PyResult.
 pub trait ReturnTypeIntoPyResult {
-    type Inner: ToPyObject;
+    type Inner;
 
     fn return_type_into_py_result(self) -> PyResult<Self::Inner>;
 }
 
-impl<T: ToPyObject> ReturnTypeIntoPyResult for T {
+impl<T: IntoPyObject> ReturnTypeIntoPyResult for T {
     type Inner = T;
 
     default fn return_type_into_py_result(self) -> PyResult<Self::Inner> {
@@ -322,7 +322,7 @@ impl<T: ToPyObject> ReturnTypeIntoPyResult for T {
     }
 }
 
-impl<T: ToPyObject> ReturnTypeIntoPyResult for PyResult<T> {
+impl<T: IntoPyObject> ReturnTypeIntoPyResult for PyResult<T> {
     type Inner = T;
 
     fn return_type_into_py_result(self) -> PyResult<Self::Inner> {