From 6d9006436eda1934c307b9688607c455b6a5054c Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Mon, 23 Nov 2020 20:38:51 +0000
Subject: util.promise: Use xpcall() for promise function to preserve
 tracebacks

---
 util/promise.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/util/promise.lua b/util/promise.lua
index 07c9c4dc..75c8697b 100644
--- a/util/promise.lua
+++ b/util/promise.lua
@@ -78,7 +78,7 @@ local function new(f)
 	local p = setmetatable({ _state = "pending", _next = next_pending, _pending_on_fulfilled = {}, _pending_on_rejected = {} }, promise_mt);
 	if f then
 		local resolve, reject = new_resolve_functions(p);
-		local ok, ret = pcall(f, resolve, reject);
+		local ok, ret = xpcall(f, debug.traceback, resolve, reject);
 		if not ok and p._state == "pending" then
 			reject(ret);
 		end
-- 
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