py: Move to guarded includes, everywhere in py/ core.
Addresses issue #1022.
diff --git a/py/objgenerator.h b/py/objgenerator.h
index d0066de..d1b9be4 100644
--- a/py/objgenerator.h
+++ b/py/objgenerator.h
@@ -23,5 +23,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
+#ifndef __MICROPY_INCLUDED_PY_OBJGENERATOR_H__
+#define __MICROPY_INCLUDED_PY_OBJGENERATOR_H__
+
+#include "py/obj.h"
+#include "py/runtime.h"
mp_vm_return_kind_t mp_obj_gen_resume(mp_obj_t self_in, mp_obj_t send_val, mp_obj_t throw_val, mp_obj_t *ret_val);
+
+#endif // __MICROPY_INCLUDED_PY_OBJGENERATOR_H__