diff --git a/examples/rustapi_module/setup.py b/examples/rustapi_module/setup.py
index 50eb51e7..2c59059e 100644
--- a/examples/rustapi_module/setup.py
+++ b/examples/rustapi_module/setup.py
@@ -25,11 +25,12 @@ def get_py_version_cfgs():
 
     py3_min = 5
     out_cfg = []
-    for minor in range(py3_min, version[1]+1):
+    for minor in range(py3_min, version[1] + 1):
         out_cfg.append('--cfg=Py_3_%d' % minor)
 
     return out_cfg
 
+
 install_requires = []
 tests_require = install_requires + ['pytest', 'pytest-benchmark']
 
@@ -49,6 +50,8 @@ setup(
     rust_extensions=[RustExtension('rustapi_module.othermod', 'Cargo.toml',
                                    rustc_flags=get_py_version_cfgs()),
                      RustExtension('rustapi_module.datetime', 'Cargo.toml',
+                                   rustc_flags=get_py_version_cfgs()),
+                     RustExtension('rustapi_module.subclassing', 'Cargo.toml',
                                    rustc_flags=get_py_version_cfgs())],
     install_requires=install_requires,
     tests_require=tests_require,
diff --git a/examples/rustapi_module/src/datetime.rs b/examples/rustapi_module/src/datetime.rs
new file mode 100644
index 00000000..b3c55713
--- /dev/null
+++ b/examples/rustapi_module/src/datetime.rs
@@ -0,0 +1,230 @@
+use pyo3::prelude::*;
+use pyo3::types::{
+    PyDate, PyDateAccess, PyDateTime, PyDelta, PyDeltaAccess, PyTime, PyTimeAccess,
+    PyTuple, PyTzInfo,
+};
+
+#[pyfunction]
+fn make_date(py: Python, year: i32, month: u8, day: u8) -> PyResult<Py<PyDate>> {
+    PyDate::new(py, year, month, day)
+}
+
+#[pyfunction]
+fn get_date_tuple(py: Python, d: &PyDate) -> Py<PyTuple> {
+    PyTuple::new(
+        py,
+        &[d.get_year(), d.get_month() as i32, d.get_day() as i32],
+    )
+}
+
+#[pyfunction]
+fn date_from_timestamp(py: Python, timestamp: i64) -> PyResult<Py<PyDate>> {
+    PyDate::from_timestamp(py, timestamp)
+}
+
+#[pyfunction]
+fn make_time(
+    py: Python,
+    hour: u8,
+    minute: u8,
+    second: u8,
+    microsecond: u32,
+    tzinfo: Option<&PyTzInfo>,
+) -> PyResult<Py<PyTime>> {
+    PyTime::new(
+        py,
+        hour,
+        minute,
+        second,
+        microsecond,
+        tzinfo.map(|o| o.to_object(py)).as_ref(),
+    )
+}
+
+#[cfg(Py_3_6)]
+#[pyfunction]
+fn time_with_fold(
+    py: Python,
+    hour: u8,
+    minute: u8,
+    second: u8,
+    microsecond: u32,
+    tzinfo: Option<&PyTzInfo>,
+    fold: bool,
+) -> PyResult<Py<PyTime>> {
+    PyTime::new_with_fold(
+        py,
+        hour,
+        minute,
+        second,
+        microsecond,
+        tzinfo.map(|o| o.to_object(py)).as_ref(),
+        fold,
+    )
+}
+
+#[pyfunction]
+fn get_time_tuple(py: Python, dt: &PyTime) -> Py<PyTuple> {
+    PyTuple::new(
+        py,
+        &[
+            dt.get_hour() as u32,
+            dt.get_minute() as u32,
+            dt.get_second() as u32,
+            dt.get_microsecond(),
+        ],
+    )
+}
+
+#[cfg(Py_3_6)]
+#[pyfunction]
+fn get_time_tuple_fold(py: Python, dt: &PyTime) -> Py<PyTuple> {
+    PyTuple::new(
+        py,
+        &[
+            dt.get_hour() as u32,
+            dt.get_minute() as u32,
+            dt.get_second() as u32,
+            dt.get_microsecond(),
+            dt.get_fold() as u32,
+        ],
+    )
+}
+
+#[pyfunction]
+fn make_delta(py: Python, days: i32, seconds: i32, microseconds: i32) -> PyResult<Py<PyDelta>> {
+    PyDelta::new(py, days, seconds, microseconds, true)
+}
+
+#[pyfunction]
+fn get_delta_tuple(py: Python, delta: &PyDelta) -> Py<PyTuple> {
+    PyTuple::new(
+        py,
+        &[
+            delta.get_days(),
+            delta.get_seconds(),
+            delta.get_microseconds(),
+        ],
+    )
+}
+
+#[pyfunction]
+fn make_datetime(
+    py: Python,
+    year: i32,
+    month: u8,
+    day: u8,
+    hour: u8,
+    minute: u8,
+    second: u8,
+    microsecond: u32,
+    tzinfo: Option<&PyTzInfo>,
+) -> PyResult<Py<PyDateTime>> {
+    PyDateTime::new(
+        py,
+        year,
+        month,
+        day,
+        hour,
+        minute,
+        second,
+        microsecond,
+        tzinfo.map(|o| (o.to_object(py))).as_ref(),
+    )
+}
+
+#[pyfunction]
+fn get_datetime_tuple(py: Python, dt: &PyDateTime) -> Py<PyTuple> {
+    PyTuple::new(
+        py,
+        &[
+            dt.get_year(),
+            dt.get_month() as i32,
+            dt.get_day() as i32,
+            dt.get_hour() as i32,
+            dt.get_minute() as i32,
+            dt.get_second() as i32,
+            dt.get_microsecond() as i32,
+        ],
+    )
+}
+
+#[cfg(Py_3_6)]
+#[pyfunction]
+fn get_datetime_tuple_fold(py: Python, dt: &PyDateTime) -> Py<PyTuple> {
+    PyTuple::new(
+        py,
+        &[
+            dt.get_year(),
+            dt.get_month() as i32,
+            dt.get_day() as i32,
+            dt.get_hour() as i32,
+            dt.get_minute() as i32,
+            dt.get_second() as i32,
+            dt.get_microsecond() as i32,
+            dt.get_fold() as i32,
+        ],
+    )
+}
+
+#[pyfunction]
+fn datetime_from_timestamp(py: Python, ts: f64, tz: Option<&PyTzInfo>) -> PyResult<Py<PyDateTime>> {
+    PyDateTime::from_timestamp(py, ts, tz)
+}
+
+#[pyfunction]
+fn issue_219() -> PyResult<()> {
+    let gil = Python::acquire_gil();
+    let _py = gil.python();
+    Ok(())
+}
+
+#[pyclass(extends=PyTzInfo)]
+pub struct TzClass {}
+
+#[pymethods]
+impl TzClass {
+    #[new]
+    fn __new__(obj: &PyRawObject) -> PyResult<()> {
+        obj.init(|_| TzClass {})
+    }
+
+    fn utcoffset(&self, py: Python, _dt: &PyDateTime) -> PyResult<Py<PyDelta>> {
+        PyDelta::new(py, 0, 3600, 0, true)
+    }
+
+    fn tzname(&self, _py: Python, _dt: &PyDateTime) -> PyResult<String> {
+        Ok(String::from("+01:00"))
+    }
+
+    fn dst(&self, _py: Python, _dt: &PyDateTime) -> PyResult<Option<&PyDelta>> {
+        Ok(None)
+    }
+}
+
+#[pymodinit]
+fn datetime(_py: Python, m: &PyModule) -> PyResult<()> {
+    m.add_function(wrap_function!(make_date))?;
+    m.add_function(wrap_function!(get_date_tuple))?;
+    m.add_function(wrap_function!(date_from_timestamp))?;
+    m.add_function(wrap_function!(make_time))?;
+    m.add_function(wrap_function!(get_time_tuple))?;
+    m.add_function(wrap_function!(make_delta))?;
+    m.add_function(wrap_function!(get_delta_tuple))?;
+    m.add_function(wrap_function!(make_datetime))?;
+    m.add_function(wrap_function!(get_datetime_tuple))?;
+    m.add_function(wrap_function!(datetime_from_timestamp))?;
+
+    // Python 3.6+ functions
+    #[cfg(Py_3_6)]
+    {
+        m.add_function(wrap_function!(time_with_fold))?;
+        m.add_function(wrap_function!(get_time_tuple_fold))?;
+        m.add_function(wrap_function!(get_datetime_tuple_fold))?;
+    }
+
+    m.add_function(wrap_function!(issue_219))?;
+
+    m.add_class::<TzClass>()?;
+    Ok(())
+}
diff --git a/examples/rustapi_module/src/lib.rs b/examples/rustapi_module/src/lib.rs
index d160a3a9..d0d356f1 100644
--- a/examples/rustapi_module/src/lib.rs
+++ b/examples/rustapi_module/src/lib.rs
@@ -3,235 +3,9 @@
 #[macro_use]
 extern crate pyo3;
 
-pub mod othermod;
-
 use pyo3::prelude::*;
-use pyo3::types::{
-    PyDate, PyDateAccess, PyDateTime, PyDelta, PyDeltaAccess, PyDict, PyTime, PyTimeAccess,
-    PyTuple, PyTzInfo,
-};
+use subclassing::Subclassable;
 
-#[pyfunction]
-fn make_date(py: Python, year: i32, month: u8, day: u8) -> PyResult<Py<PyDate>> {
-    PyDate::new(py, year, month, day)
-}
-
-#[pyfunction]
-fn get_date_tuple(py: Python, d: &PyDate) -> Py<PyTuple> {
-    PyTuple::new(
-        py,
-        &[d.get_year(), d.get_month() as i32, d.get_day() as i32],
-    )
-}
-
-#[pyfunction]
-fn date_from_timestamp(py: Python, timestamp: i64) -> PyResult<Py<PyDate>> {
-    PyDate::from_timestamp(py, timestamp)
-}
-
-#[pyfunction]
-fn make_time(
-    py: Python,
-    hour: u8,
-    minute: u8,
-    second: u8,
-    microsecond: u32,
-    tzinfo: Option<&PyTzInfo>,
-) -> PyResult<Py<PyTime>> {
-    PyTime::new(
-        py,
-        hour,
-        minute,
-        second,
-        microsecond,
-        tzinfo.map(|o| o.to_object(py)).as_ref(),
-    )
-}
-
-#[cfg(Py_3_6)]
-#[pyfunction]
-fn time_with_fold(
-    py: Python,
-    hour: u8,
-    minute: u8,
-    second: u8,
-    microsecond: u32,
-    tzinfo: Option<&PyTzInfo>,
-    fold: bool,
-) -> PyResult<Py<PyTime>> {
-    PyTime::new_with_fold(
-        py,
-        hour,
-        minute,
-        second,
-        microsecond,
-        tzinfo.map(|o| o.to_object(py)).as_ref(),
-        fold,
-    )
-}
-
-#[pyfunction]
-fn get_time_tuple(py: Python, dt: &PyTime) -> Py<PyTuple> {
-    PyTuple::new(
-        py,
-        &[
-            dt.get_hour() as u32,
-            dt.get_minute() as u32,
-            dt.get_second() as u32,
-            dt.get_microsecond(),
-        ],
-    )
-}
-
-#[cfg(Py_3_6)]
-#[pyfunction]
-fn get_time_tuple_fold(py: Python, dt: &PyTime) -> Py<PyTuple> {
-    PyTuple::new(
-        py,
-        &[
-            dt.get_hour() as u32,
-            dt.get_minute() as u32,
-            dt.get_second() as u32,
-            dt.get_microsecond(),
-            dt.get_fold() as u32,
-        ],
-    )
-}
-
-#[pyfunction]
-fn make_delta(py: Python, days: i32, seconds: i32, microseconds: i32) -> PyResult<Py<PyDelta>> {
-    PyDelta::new(py, days, seconds, microseconds, true)
-}
-
-#[pyfunction]
-fn get_delta_tuple(py: Python, delta: &PyDelta) -> Py<PyTuple> {
-    PyTuple::new(
-        py,
-        &[
-            delta.get_days(),
-            delta.get_seconds(),
-            delta.get_microseconds(),
-        ],
-    )
-}
-
-#[pyfunction]
-fn make_datetime(
-    py: Python,
-    year: i32,
-    month: u8,
-    day: u8,
-    hour: u8,
-    minute: u8,
-    second: u8,
-    microsecond: u32,
-    tzinfo: Option<&PyTzInfo>,
-) -> PyResult<Py<PyDateTime>> {
-    PyDateTime::new(
-        py,
-        year,
-        month,
-        day,
-        hour,
-        minute,
-        second,
-        microsecond,
-        tzinfo.map(|o| (o.to_object(py))).as_ref(),
-    )
-}
-
-#[pyfunction]
-fn get_datetime_tuple(py: Python, dt: &PyDateTime) -> Py<PyTuple> {
-    PyTuple::new(
-        py,
-        &[
-            dt.get_year(),
-            dt.get_month() as i32,
-            dt.get_day() as i32,
-            dt.get_hour() as i32,
-            dt.get_minute() as i32,
-            dt.get_second() as i32,
-            dt.get_microsecond() as i32,
-        ],
-    )
-}
-
-#[cfg(Py_3_6)]
-#[pyfunction]
-fn get_datetime_tuple_fold(py: Python, dt: &PyDateTime) -> Py<PyTuple> {
-    PyTuple::new(
-        py,
-        &[
-            dt.get_year(),
-            dt.get_month() as i32,
-            dt.get_day() as i32,
-            dt.get_hour() as i32,
-            dt.get_minute() as i32,
-            dt.get_second() as i32,
-            dt.get_microsecond() as i32,
-            dt.get_fold() as i32,
-        ],
-    )
-}
-
-#[pyfunction]
-fn datetime_from_timestamp(py: Python, ts: f64, tz: Option<&PyTzInfo>) -> PyResult<Py<PyDateTime>> {
-    PyDateTime::from_timestamp(py, ts, tz)
-}
-
-#[pyfunction]
-fn issue_219() -> PyResult<()> {
-    let gil = Python::acquire_gil();
-    let _py = gil.python();
-    Ok(())
-}
-
-#[pyclass(extends=PyTzInfo)]
-pub struct TzClass {}
-
-#[pymethods]
-impl TzClass {
-    #[new]
-    fn __new__(obj: &PyRawObject) -> PyResult<()> {
-        obj.init(|_| TzClass {})
-    }
-
-    fn utcoffset(&self, py: Python, dt: &PyDateTime) -> PyResult<Py<PyDelta>> {
-        PyDelta::new(py, 0, 3600, 0, true)
-    }
-
-    fn tzname(&self, py: Python, dt: &PyDateTime) -> PyResult<String> {
-        Ok(String::from("+01:00"))
-    }
-
-    fn dst(&self, py: Python, dt: &PyDateTime) -> PyResult<Option<&PyDelta>> {
-        Ok(None)
-    }
-}
-
-#[pymodinit]
-fn datetime(_py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_function(wrap_function!(make_date))?;
-    m.add_function(wrap_function!(get_date_tuple))?;
-    m.add_function(wrap_function!(date_from_timestamp))?;
-    m.add_function(wrap_function!(make_time))?;
-    m.add_function(wrap_function!(get_time_tuple))?;
-    m.add_function(wrap_function!(make_delta))?;
-    m.add_function(wrap_function!(get_delta_tuple))?;
-    m.add_function(wrap_function!(make_datetime))?;
-    m.add_function(wrap_function!(get_datetime_tuple))?;
-    m.add_function(wrap_function!(datetime_from_timestamp))?;
-
-    // Python 3.6+ functions
-    #[cfg(Py_3_6)]
-    {
-        m.add_function(wrap_function!(time_with_fold))?;
-        m.add_function(wrap_function!(get_time_tuple_fold))?;
-        m.add_function(wrap_function!(get_datetime_tuple_fold))?;
-    }
-
-    m.add_function(wrap_function!(issue_219))?;
-
-    m.add_class::<TzClass>()?;
-    Ok(())
-}
+pub mod othermod;
+pub mod subclassing;
+pub mod datetime;
diff --git a/examples/rustapi_module/src/subclassing.rs b/examples/rustapi_module/src/subclassing.rs
new file mode 100644
index 00000000..7cc795e7
--- /dev/null
+++ b/examples/rustapi_module/src/subclassing.rs
@@ -0,0 +1,21 @@
+//! Test for [#220](https://github.com/PyO3/pyo3/issues/220)
+
+use pyo3::prelude::*;
+
+#[pyclass(subclass)]
+pub struct Subclassable {}
+
+#[pymethods]
+impl Subclassable {
+    #[new]
+    fn __new__(obj: &PyRawObject) -> PyResult<()> {
+        obj.init(|_| Subclassable {})
+    }
+}
+
+#[pymodinit]
+fn subclassing(_py: Python, m: &PyModule) -> PyResult<()> {
+    m.add_class::<Subclassable>()?;
+    Ok(())
+}
+
diff --git a/examples/rustapi_module/tests/test_subclassing.py b/examples/rustapi_module/tests/test_subclassing.py
new file mode 100644
index 00000000..8c086b75
--- /dev/null
+++ b/examples/rustapi_module/tests/test_subclassing.py
@@ -0,0 +1,9 @@
+from rustapi_module.subclassing import Subclassable
+
+
+class SomeSubClass(Subclassable):
+    pass
+
+
+a = SomeSubClass()
+_b = str(a) + repr(a)