From 12fac458915723dd5453ac4bc2db5dd7beb5fe3c Mon Sep 17 00:00:00 2001
From: Cobord <ammar.s.husain@gmail.com>
Date: Thu, 14 Mar 2024 17:08:38 -0400
Subject: [PATCH] doc:update comment about stability of RPITIT

---
 tket2/src/passes/commutation.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tket2/src/passes/commutation.rs b/tket2/src/passes/commutation.rs
index c493a015..df058017 100644
--- a/tket2/src/passes/commutation.rs
+++ b/tket2/src/passes/commutation.rs
@@ -281,6 +281,8 @@ impl Rewrite for PullForward {
     fn invalidation_set(&self) -> Self::InvalidationSet<'_> {
         // TODO: This could avoid creating a vec, but it'll be easier to do once
         // return position impl trait is available.
+        // RPITIT requires 1.75 stable in December 2023
+        // could change Rewrite trait to take that into account if using that version
         let mut nodes = vec![self.command.node()];
         let next_nodes = self.new_nexts.values().map(|c| c.node());
         nodes.extend(next_nodes);