_adapters: fix DegenerateFiles not exposing loader contents

Signed-off-by: Filipe Laíns <[email protected]>

Author: FFY00

importlib_resources/_adapters.py

@@ -35,7 +35,12 @@ class DegenerateFiles:
     """
 
     class Path(abc.Traversable):
+        def __init__(self, spec):
+            self.spec = spec
+
         def iterdir(self):
+            if isinstance(self.spec.loader, abc.ResourceReader):
+                return self.spec.loader.contents()
             return iter(())
 
         def is_dir(self):
@@ -71,7 +76,7 @@ def __getattr__(self, attr):
         return getattr(self._reader, attr)
 
     def files(self):
-        return DegenerateFiles.Path()
+        return DegenerateFiles.Path(self.spec)
 
 
 def wrap_spec(package):