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// one: passes up the error from two()
function one(cb){
two(function(err, data){
if(err) return cb('one ' + err);
return cb(null, data);
// two: passes up the error from three()
function two(cb){
three(function(err, data){
if(err) return cb('two ' + err);
return cb(null, data);
// three: always returns an error
function three(cb){
cb('three: something bad happened');
// kick off one(), log the inevitable error with a simple function trace
one(function(err, data){
if(err) {
// output:
// one two three: something bad happened
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