Always clone on in getters

Since copy implies clone, this doesn't  code.

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+* Always clone in getters. This allows using the get-annotation on all Clone-Types
+
 ## 0.2.7 (2018-05-18)
 
 * Fix nightly breakage with proc_macro_path

pyo3-derive-backend/src/py_class.rs

@@ -302,7 +302,7 @@ fn impl_descriptors(
                     quote! {
                         impl #cls {
                             fn #name(&self) -> _pyo3::PyResult<#field_ty> {
-                                Ok(self.#name)
+                                Ok(self.#name.clone())
                             }
                         }
                     }

tests/test_getter_setter.rs

@@ -54,6 +54,8 @@ fn class_with_properties() {
 struct GetterSetter {
     #[prop(get, set)]
     num: i32,
+    #[prop(get, set)]
+    text: String,
     token: PyToken
 }
 
@@ -70,8 +72,9 @@ fn getter_setter_autogen() {
     let gil = Python::acquire_gil();
     let py = gil.python();
 
-    let inst = py.init(|t| GetterSetter{num: 10, token: t}).unwrap();
+    let inst = py.init(|t| GetterSetter{num: 10, token: t, text: "Hello".to_string()}).unwrap();
 
     py_run!(py, inst, "assert inst.num == 10");
     py_run!(py, inst, "inst.num = 20; assert inst.num == 20");
+    py_run!(py, inst, "assert inst.text == 'Hello'; inst.text = 'There'; assert inst.text == 'There'");
 }