Fix an issue with names

jedi/inference/names.py

@@ -232,7 +232,8 @@ class ValueNameMixin(object):
         if not doc and self._value.is_stub():
             from jedi.inference.gradual.conversion import convert_names
             names = convert_names([self], prefer_stub_to_compiled=False)
-            return _merge_name_docs(names)
+            if self not in names:
+                return _merge_name_docs(names)
         return doc
 
     def _get_qualified_names(self):

test/test_api/test_completion.py

@@ -429,3 +429,10 @@ def test_completion_cache(Script, module_injector):
     cls, = c.infer()
     assert cls.type == 'class'
     assert cls.docstring() == 'foo()\n\ndoc2'
+
+
+def test_typing_module_completions(Script):
+    for c in Script('import typing; typing.').completions():
+        # Just make sure that there are no errors
+        c.type
+        c.docstring()