From 600bc093bbf6631b0a3f4ef482c57d18de53f4cb Mon Sep 17 00:00:00 2001
From: Alexander Wang <alex@terrastruct.com>
Date: Wed, 20 Mar 2024 16:03:09 -0700
Subject: [PATCH] prevent cycle in d2chaos sequence diagram

---
 d2chaos/d2chaos.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/d2chaos/d2chaos.go b/d2chaos/d2chaos.go
index 96f9cd906..bf6961d4e 100644
--- a/d2chaos/d2chaos.go
+++ b/d2chaos/d2chaos.go
@@ -137,6 +137,9 @@ func (gs *dslGenState) edge() error {
 		if err != nil {
 			return err
 		}
+		if src == dst && gs.nodeShapes[dst] == d2target.ShapeSequenceDiagram {
+			break
+		}
 		if gs.findOuterSequenceDiagram(src) == gs.findOuterSequenceDiagram(dst) {
 			break
 		}