Issue #14605: Revert renaming of _SourcelessFileLoader, since it caused
the buildbots to fail.
diff --git a/Lib/importlib/machinery.py b/Lib/importlib/machinery.py
index 07465ce..c9906c7 100644
--- a/Lib/importlib/machinery.py
+++ b/Lib/importlib/machinery.py
@@ -5,5 +5,5 @@
 from ._bootstrap import PathFinder
 from ._bootstrap import FileFinder
 from ._bootstrap import SourceFileLoader
-from ._bootstrap import SourcelessFileLoader
+from ._bootstrap import _SourcelessFileLoader
 from ._bootstrap import ExtensionFileLoader