Remove the __builtin__ compatibility

jedi/api/__init__.py

@@ -242,7 +242,7 @@ class Script(object):
             code_lines=self._code_lines,
             is_package=is_package,
         )
-        if names[0] not in ('builtins', '__builtin__', 'typing'):
+        if names[0] not in ('builtins', 'typing'):
             # These modules are essential for Jedi, so don't overwrite them.
             self._inference_state.module_cache.add(names, ValueSet([module]))
         return module

jedi/api/classes.py

@@ -70,7 +70,6 @@ class BaseName(object):
         '_collections': 'collections',
         '_socket': 'socket',
         '_sqlite3': 'sqlite3',
-        '__builtin__': 'builtins',
     }
 
     _tuple_mapping = dict((tuple(k.split('.')), v) for (k, v) in {