From 20b83aa5a5014b55ff137e429ec11f7aa09b807c Mon Sep 17 00:00:00 2001
From: Tony Garnock-Jones <tonyg@leastfixedpoint.com>
Date: Thu, 9 Dec 2021 18:52:22 +0100
Subject: [PATCH] Support stopping a root facet, such as happens when a link
 between actors is broken

---
 packages/core/src/runtime/actor.ts | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/packages/core/src/runtime/actor.ts b/packages/core/src/runtime/actor.ts
index 354c256..930a558 100644
--- a/packages/core/src/runtime/actor.ts
+++ b/packages/core/src/runtime/actor.ts
@@ -302,10 +302,14 @@ export class Turn {
     }
 
     stop(facet: Facet = this.activeFacet, continuation?: LocalAction) {
-        this.enqueue(facet.parent!, () => {
-            facet._terminate(true);
-            if (continuation) continuation();
-        });
+        if (facet.parent === null) {
+            this.stopActor();
+        } else {
+            this.enqueue(facet.parent, () => {
+                facet._terminate(true);
+                if (continuation) continuation();
+            });
+        }
     }
 
     // Alias for syndicatec code generator to use