From 4181855d09c1b9f750f19b0afa293a05be73a514 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 30 Jun 2026 20:24:31 +0000
Subject: [PATCH] Add test case with MISSING tag demonstrating
 instance-across-call shortcoming

---
 .../dataflow/typetracking/attribute_tests.py         | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/python/ql/test/library-tests/dataflow/typetracking/attribute_tests.py b/python/ql/test/library-tests/dataflow/typetracking/attribute_tests.py
index b6bca72507f..724be1091a4 100644
--- a/python/ql/test/library-tests/dataflow/typetracking/attribute_tests.py
+++ b/python/ql/test/library-tests/dataflow/typetracking/attribute_tests.py
@@ -161,6 +161,18 @@ print(instance.foo) # $ tracked MISSING: tracked=foo
 instance.print_foo() # $ MISSING: tracked=foo
 
 
+# attribute set in method, but the instance flows across a call/return before the read.
+# `instanceFieldStep` identifies the instance using only local flow from the constructor
+# call, so a value stored on `self.foo` is not seen once the instance has crossed a
+# function boundary.
+
+def make_my_class2():
+    return MyClass2()
+
+returned_instance = make_my_class2()
+print(returned_instance.foo) # $ MISSING: tracked
+
+
 # attribute set from outside of class
 
 class MyClass3(object):