From bccd4af1ff4259cbe92f0a3b663ca67c09dc645e Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 11 May 2022 11:17:16 +0100
Subject: [PATCH] stop possibility of infinite recursion in stages which set
 "stage = self"

---
 src/nmutil/stageapi.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/nmutil/stageapi.py b/src/nmutil/stageapi.py
index 01fc568..a34dc7e 100644
--- a/src/nmutil/stageapi.py
+++ b/src/nmutil/stageapi.py
@@ -197,7 +197,8 @@ class StageHelper(Stage):
 
     def setup(self, m, i):
         if self.stage is not None and hasattr(self.stage, "setup"):
-            self.stage.setup(m, i)
+            if self.stage is not self: # stop infinite recursion
+                self.stage.setup(m, i)
 
     def _postprocess(self, i):  # XXX DISABLED
         return i  # RETURNS INPUT
-- 
2.30.2