bpo-35923: Update the BuiltinImporter to use loader._ORIGIN instead of a hard-coded value (GH-15651)

Lib/importlib/_bootstrap.py

@@ -713,6 +713,8 @@ class BuiltinImporter:
 
     """
 
+    _ORIGIN = "built-in"
+
     @staticmethod
     def module_repr(module):
         """Return repr for the module.
@@ -720,14 +722,14 @@ class BuiltinImporter:
         The method is deprecated.  The import machinery does the job itself.
 
         """
-        return '<module {!r} (built-in)>'.format(module.__name__)
+        return f'<module {module.__name__!r} ({BuiltinImporter._ORIGIN})>'
 
     @classmethod
     def find_spec(cls, fullname, path=None, target=None):
         if path is not None:
             return None
         if _imp.is_builtin(fullname):
-            return spec_from_loader(fullname, cls, origin='built-in')
+            return spec_from_loader(fullname, cls, origin=cls._ORIGIN)
         else:
             return None
 

Misc/NEWS.d/next/Library/2019-09-03-01-41-35.bpo-35923.lYpKbY.rst

@@ -0,0 +1,2 @@
+Update :class:`importlib.machinery.BuiltinImporter` to use ``loader._ORIGIN``
+instead of a hardcoded value. Patch by Dong-hee Na.