Return annotations for compiled objects now help to infer

However only if it's a type, if it's a string, it doesn't work, yet

Fixes #1347

jedi/evaluate/compiled/access.py

@@ -448,6 +448,17 @@ class DirectObjectAccess(object):
             # the signature. In that case we just want a simple escape for now.
             raise ValueError
 
+    def get_return_annotation(self):
+        try:
+            o = self._obj.__annotations__.get('return')
+        except AttributeError:
+            return None
+
+        if o is None:
+            return None
+
+        return self._create_access_path(o)
+
     def negate(self):
         return self._create_access_path(-self._obj)
 

jedi/evaluate/compiled/context.py

@@ -46,6 +46,11 @@ class CompiledObject(Context):
         self.access_handle = access_handle
 
     def py__call__(self, arguments):
+        return_annotation = self.access_handle.get_return_annotation()
+        if return_annotation is not None:
+            # TODO the return annotation may also be a string.
+            return create_from_access_path(self.evaluator, return_annotation).execute_annotation()
+
         try:
             self.access_handle.getattr_paths(u'__call__')
         except AttributeError: