Get some sys completions working

jedi/plugins/typeshed.py

@@ -123,9 +123,7 @@ class TypeshedPlugin(BasePlugin):
             context_set = callback(
                 evaluator,
                 import_names,
-                parent_module_context.actual_context  # noqa
-                    if isinstance(parent_module_context, StubModuleContext)
-                    else parent_module_context,
+                parent_module_context,
                 sys_path
             )
             # Don't use CompiledObjects, they are just annoying and don't

test/test_plugin/test_stub.py

@@ -81,6 +81,12 @@ def test_method(Script):
     assert context.class_context.py__name__() == 'str'
 
 
+def test_sys(Script):
+    code = 'import sys; sys.exc_info()[1]'
+    def_, = Script(code).goto_definitions()
+    assert def_.name == 'BaseException'
+
+
 def test_math(Script):
     def_, = Script('import math; math.acos()').goto_definitions()
     assert def_.name == 'float'