diff --git a/Cargo.toml b/Cargo.toml
index 4521bea9..339944ce 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,7 +30,7 @@ mashup = "0.1.7"
 docmatic = "0.1.2"
 
 [build-dependencies]
-regex = "1.0.4"
+regex = "1.0.5"
 version_check = "0.1.4"
 
 [features]
diff --git a/pyo3-derive-backend/Cargo.toml b/pyo3-derive-backend/Cargo.toml
index f430aafb..7835c27b 100644
--- a/pyo3-derive-backend/Cargo.toml
+++ b/pyo3-derive-backend/Cargo.toml
@@ -5,15 +5,11 @@ description = "Code generation for PyO3 package"
 authors = ["PyO3 Project and Contributors <https://github.com/PyO3>"]
 keywords = ["pyo3", "python", "cpython", "ffi"]
 homepage = "https://github.com/pyo3/pyo3"
-repository = "https://github.com/pyo3/pyo3.git"
-documentation = "https://pyo3.github.io/pyo3/guide/"
+repository = "https://github.com/pyo3/pyo3"
 categories = ["api-bindings", "development-tools::ffi"]
 license = "Apache-2.0"
 
 [dependencies]
-quote = "0.6.6"
-proc-macro2 = "0.4.13"
-
-[dependencies.syn-next]
-version = "0.15.0-rc"
-features = ["full", "extra-traits"]
+quote = "0.6.8"
+proc-macro2 = "0.4.18"
+syn = { version = "0.15.1", features = ["full", "extra-traits"] }
diff --git a/pyo3-derive-backend/src/module.rs b/pyo3-derive-backend/src/module.rs
index 090ef8cf..2386b8f9 100644
--- a/pyo3-derive-backend/src/module.rs
+++ b/pyo3-derive-backend/src/module.rs
@@ -202,7 +202,10 @@ fn function_wrapper_ident(name: &syn::Ident) -> syn::Ident {
     // Make sure this ident matches the one of wrap_function
     // The trim_left_matches("r#") is for https://github.com/dtolnay/syn/issues/478
     syn::Ident::new(
-        &format!("__pyo3_get_function_{}", name.to_string().trim_left_matches("r#")),
+        &format!(
+            "__pyo3_get_function_{}",
+            name.to_string().trim_left_matches("r#")
+        ),
         Span::call_site(),
     )
 }
diff --git a/pyo3-derive-backend/src/py_class.rs b/pyo3-derive-backend/src/py_class.rs
index fc0d02f0..27c510c6 100644
--- a/pyo3-derive-backend/src/py_class.rs
+++ b/pyo3-derive-backend/src/py_class.rs
@@ -229,13 +229,13 @@ fn impl_class(
         // but for now it works and it only safe code and it is required to return custom
         // objects, so for now I'm keeping it
         impl ::pyo3::IntoPyObject for #cls {
-            fn into_object<'p>(self, py: ::pyo3::Python<'p>) -> ::pyo3::PyObject {
+            fn into_object(self, py: ::pyo3::Python) -> ::pyo3::PyObject {
                 ::pyo3::Py::new(py, |_| self).unwrap().into_object(py)
             }
         }
 
         impl ::pyo3::ToPyObject for #cls {
-            fn to_object<'p>(&self, py: ::pyo3::Python<'p>) -> ::pyo3::PyObject {
+            fn to_object(&self, py: ::pyo3::Python) -> ::pyo3::PyObject {
                 unsafe { ::pyo3::PyObject::from_borrowed_ptr(py, self.as_ptr()) }
             }
         }
@@ -250,7 +250,7 @@ fn impl_class(
         }
 
         impl<'a> ::pyo3::ToPyObject for &'a mut #cls {
-            fn to_object<'p>(&self, py: ::pyo3::Python<'p>) -> ::pyo3::PyObject {
+            fn to_object(&self, py: ::pyo3::Python) -> ::pyo3::PyObject {
                 unsafe { ::pyo3::PyObject::from_borrowed_ptr(py, self.as_ptr()) }
             }
         }
diff --git a/pyo3cls/Cargo.toml b/pyo3cls/Cargo.toml
index 52f74b28..020f1835 100644
--- a/pyo3cls/Cargo.toml
+++ b/pyo3cls/Cargo.toml
@@ -5,8 +5,7 @@ description = "Proc macros for PyO3 package"
 authors = ["PyO3 Project and Contributors <https://github.com/PyO3>"]
 keywords = ["pyo3", "python", "cpython", "ffi"]
 homepage = "https://github.com/pyo3/pyo3"
-repository = "https://github.com/pyo3/pyo3.git"
-documentation = "https://docs.rs/pyo3cls"
+repository = "https://github.com/pyo3/pyo3"
 categories = ["api-bindings", "development-tools::ffi"]
 license = "Apache-2.0"
 
@@ -14,13 +13,7 @@ license = "Apache-2.0"
 proc-macro = true
 
 [dependencies]
-quote= "0.6.6"
-proc-macro2 = "0.4.13"
-
-[dependencies.syn-next]
-version= "0.15.0-rc"
-features=["full", "extra-traits"]
-
-[dependencies.pyo3-derive-backend]
-path = "../pyo3-derive-backend"
-version = "=0.5.0"
+quote= "0.6.8"
+proc-macro2 = "0.4.18"
+syn = { version = "0.15.1", features = ["full", "extra-traits"] }
+pyo3-derive-backend = { path = "../pyo3-derive-backend", version = "=0.5.0" }
diff --git a/pyo3cls/src/lib.rs b/pyo3cls/src/lib.rs
index 145d5a9e..96c085dd 100644
--- a/pyo3cls/src/lib.rs
+++ b/pyo3cls/src/lib.rs
@@ -12,10 +12,10 @@ extern crate quote;
 #[macro_use]
 extern crate syn;
 
+use proc_macro2::Span;
 use pyo3_derive_backend::*;
 use syn::parse::Parser;
 use syn::punctuated::Punctuated;
-use proc_macro2::Span;
 
 #[proc_macro_attribute]
 pub fn mod2init(
@@ -143,7 +143,10 @@ pub fn pyfunction(
     let mut ast: syn::ItemFn = syn::parse(input).expect("#[function] must be used on a `fn` block");
 
     // Workaround for https://github.com/dtolnay/syn/issues/478
-    let python_name = syn::Ident::new(&ast.ident.to_string().trim_left_matches("r#"), Span::call_site());
+    let python_name = syn::Ident::new(
+        &ast.ident.to_string().trim_left_matches("r#"),
+        Span::call_site(),
+    );
     let expanded = module::add_fn_to_module(&mut ast, &python_name, Vec::new());
 
     quote!(
diff --git a/src/class/mapping.rs b/src/class/mapping.rs
index ff01698e..5ce4dc2f 100644
--- a/src/class/mapping.rs
+++ b/src/class/mapping.rs
@@ -225,11 +225,7 @@ impl<'p, T> DeplItemDipatch for T where T: PyMappingProtocol<'p> {}
 /// Returns `py_func_set_del` if PyMappingSetItemProtocol is implemented, otherwise `py_func_del`
 trait DelSetItemDispatch: Sized + for<'p> PyMappingDelItemProtocol<'p> {
     fn det_set_dispatch() -> Option<ffi::objobjargproc> {
-        py_func_del!(
-            PyMappingDelItemProtocol,
-            Self,
-            __delitem__
-        )
+        py_func_del!(PyMappingDelItemProtocol, Self, __delitem__)
     }
 }
 
diff --git a/tests/common.rs b/tests/common.rs
index 84f0f7bf..20edc1ad 100644
--- a/tests/common.rs
+++ b/tests/common.rs
@@ -27,8 +27,14 @@ macro_rules! py_run {
         let d = PyDict::new($py);
         d.set_item(stringify!($val), &$val).unwrap();
         $py.run(&common::indoc($code), None, Some(d))
-            .map_err(|e| e.print($py))
-            .expect(&common::indoc($code))
+            .map_err(|e| {
+                e.print($py);
+                // So when this c api function the last line called printed the error to stderr,
+                // the output is only written into a buffer which is never flushed because we
+                // panic before flushing. This is where this hack comes into place
+                $py.run("import sys; sys.stderr.flush()", None, None)
+                    .unwrap();
+            }).expect(&common::indoc($code))
     }};
 }
 
diff --git a/tests/test_various.rs b/tests/test_various.rs
index 9eea3e95..c1a1c058 100644
--- a/tests/test_various.rs
+++ b/tests/test_various.rs
@@ -1,5 +1,6 @@
 #![feature(specialization)]
 
+#[macro_use]
 extern crate pyo3;
 
 use pyo3::prelude::*;
@@ -39,3 +40,29 @@ fn mut_ref_arg() {
     py.run("inst1.set_other(inst2)", None, Some(d)).unwrap();
     assert_eq!(inst2.as_ref(py).n, 100);
 }
+
+#[pyclass]
+struct PyUsize {
+    #[prop(get)]
+    pub value: usize,
+}
+
+#[pyfunction]
+fn get_zero() -> PyResult<PyUsize> {
+    Ok(PyUsize { value: 0 })
+}
+
+#[test]
+/// Checks that we can use return a custom class in arbitrary function and use those functions
+/// both in rust and python
+fn return_custom_class() {
+    let gil = Python::acquire_gil();
+    let py = gil.python();
+
+    // Using from rust
+    assert_eq!(get_zero().unwrap().value, 0);
+
+    // Using from python
+    let get_zero = wrap_function!(get_zero)(py);
+    py_assert!(py, get_zero, "get_zero().value == 0");
+}