# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1539862399 -7200
# Node ID 2571c65b972ffbd6b42f7a28d715815e913a12ba
# Parent  9db707a86a258d12be7099b5353631727724f5b0
util.promise: Add a string representation

diff -r 9db707a86a25 -r 2571c65b972f util/promise.lua
--- a/util/promise.lua	Thu Oct 18 12:13:17 2018 +0100
+++ b/util/promise.lua	Thu Oct 18 13:33:19 2018 +0200
@@ -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;