mod_c2s: Add event just before closing as session To allow modules to do things just before the session is closed. The '(pre-)resource-unbind' events are fired after the stream is closed, leaving no way to send something.

local xpcall = xpcall;

if select(2, xpcall(function (x) return x end, function () end,  "test")) ~= "test" then
	xpcall = require"util.compat".xpcall;
end

return {
	xpcall = xpcall;
};