From 6f0d5898132801206f2304f5a572bdc679167ff5 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Thu, 18 Oct 2018 13:33:19 +0200
Subject: util.promise: Add a string representation

---
 util/promise.lua | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/util/promise.lua b/util/promise.lua
index 8b57c822..b5660488 100644
--- a/util/promise.lua
+++ b/util/promise.lua
@@ -1,6 +1,10 @@
 local promise_methods = {};
 local promise_mt = { __name = "promise", __index = promise_methods };
 
+function promise_mt:__tostring()
+	return  "promise (" .. (self._state or "invalid") .. ")";
+end
+
 local function is_promise(o)
 	local mt = getmetatable(o);
 	return mt == promise_mt;
-- 
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