From c4ff0e96c7ca966608926ac169ef586576477ecc Mon Sep 17 00:00:00 2001
From: code-review-doctor <contact+django-doctor-test@richardtier.co.uk>
Date: Sun, 24 Apr 2022 00:04:19 +0100
Subject: [PATCH]  Fix issue probably-meant-fstring found at
 https://codereview.doctor

---
 faust/streams.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/faust/streams.py b/faust/streams.py
index 4a2a6b5a0..2e6e4cd91 100644
--- a/faust/streams.py
+++ b/faust/streams.py
@@ -207,7 +207,7 @@ def _iter_ll(self, dir_: _LinkedListDirection) -> Iterator[StreamT]:
         while node:
             if node in seen:
                 raise RuntimeError(
-                    'Loop in Stream.{dir_.attr}: Call support!')
+                    f'Loop in Stream.{dir_.attr}: Call support!')
             seen.add(node)
             yield node
             node = dir_.getter(node)