[3.10] bpo-45419: Fix interfaces on DegenerateFiles.Path (GH-28844)

Author: jaraco

Lib/importlib/_adapters.py

@@ -46,10 +46,11 @@ def is_dir(self):
         def joinpath(self, other):
             return DegenerateFiles.Path()
 
+        @property
         def name(self):
             return ''
 
-        def open(self):
+        def open(self, mode='rb', *args, **kwargs):
             raise ValueError()
 
     def __init__(self, spec):

Misc/NEWS.d/next/Library/2021-10-09-20-53-13.bpo-45419.CauCgt.rst

@@ -0,0 +1 @@
+Correct interfaces on DegenerateFiles.Path.