From 3dd916b6ac5cbc6d7ccc5a93b6a5ca577d63ec11 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sat, 2 Oct 2021 18:28:44 +0800
Subject: [PATCH] nac3artiq: update unsendable comment

---
 nac3artiq/src/lib.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/nac3artiq/src/lib.rs b/nac3artiq/src/lib.rs
index b99cabb5d..042a7ce72 100644
--- a/nac3artiq/src/lib.rs
+++ b/nac3artiq/src/lib.rs
@@ -39,8 +39,8 @@ enum Isa {
     CortexA9,
 }
 
-// TODO: do we really want unsendable?
-// TopLevelComposer causes a lot of problems for Send.
+// TopLevelComposer is unsendable as it holds the unification table, which is
+// unsendable due to Rc. Arc would cause a performance hit.
 #[pyclass(unsendable, name = "NAC3")]
 struct Nac3 {
     isa: Isa,