From 6a55404968b2da12124b9dc5164db1f5354b9012 Mon Sep 17 00:00:00 2001
From: Matthias Bussonnier <bussonniermatthias@gmail.com>
Date: Tue, 23 Jan 2024 09:50:36 +0100
Subject: [PATCH] Fix for #281

It seem that in 3.11 there is now another FrozenImporter from
_frozen_importlib, I did not manage to get isinstance to work with it so
we need to check with hasattr.
---
 lib/python/pyflyby/_modules.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/python/pyflyby/_modules.py b/lib/python/pyflyby/_modules.py
index fb37cdc4..add41481 100644
--- a/lib/python/pyflyby/_modules.py
+++ b/lib/python/pyflyby/_modules.py
@@ -250,6 +250,8 @@ def filename(self):
         # Get the filename using loader.get_filename().  Note that this does
         # more than just loader.filename: for example, it adds /__init__.py
         # for packages.
+        if not hasattr(loader, 'get_filename'):
+            return None
         filename = loader.get_filename()
         if not filename:
             return None