From 8765cbc4d0c629c8158a5341e1b4305fd93c3a90 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=B3n=C3=A1n=20Carrigan?= <rcarriga@tcd.ie>
Date: Thu, 2 May 2024 16:37:47 +0100
Subject: [PATCH] fix(tasks): gracefully handle callbacks after cancel

If a callback returns after a task is already cancelled, we should
gracefully handle it by not attempting to set the result of the task
since it is already set.

See #15
---
 lua/nio/tasks.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lua/nio/tasks.lua b/lua/nio/tasks.lua
index 58660c2..4bb2cc6 100644
--- a/lua/nio/tasks.lua
+++ b/lua/nio/tasks.lua
@@ -88,6 +88,9 @@ function nio.tasks.run(func, cb)
   end
 
   local function close_task(result, err)
+    if not tasks[co] then
+      return
+    end
     tasks[co] = nil
     if err then
       future.set_error(err)