diff --git a/util.lua b/util.lua
index a850a17..a2fe705 100644
--- a/util.lua
+++ b/util.lua
@@ -1 +1,14 @@
 function join_tables(t1, t2) for k,v in ipairs(t2) do table.insert(t1, v) end return t1 end
+
+function dump(o)
+    if type(o) == 'table' then
+        local s = '{ '
+        for k,v in pairs(o) do
+            if type(k) ~= 'number' then k = '"'..k..'"' end
+            s = s .. '['..k..'] = ' .. dump(v) .. ','
+        end
+        return s .. '} '
+    else
+        return tostring(o)
+    end
+end