From 5526bed4c3714594f75259483ebef5db4cd424a9 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Fri, 3 Feb 2023 21:17:08 +0100
Subject: [PATCH] Express rules: allow indexing in sets

---
 src/ifcopenshell-python/ifcopenshell/express/rule_compiler.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ifcopenshell-python/ifcopenshell/express/rule_compiler.py b/src/ifcopenshell-python/ifcopenshell/express/rule_compiler.py
index 1ed05df3d0..da16e968b9 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rule_compiler.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rule_compiler.py
@@ -648,7 +648,9 @@ class express_set(set):
     __radd__ = __add__
     def __repr__(self):
         return repr(set(self))
-
+    def __getitem__(self, k):
+        # @todo this is obviously not stable, but should be good enough?
+        return list(self)[k]
 
 def typeof(inst):
     if not inst: