Keeping variables scoped for [step](https://github.com/creationix/step) calls

step-scoped.coffee

Step = require 'step'

Step(
  ->
    return 'mine'
  (err, @scoped) ->
    console.log '1', @scoped

    return 'diff1'
  (err, msg) ->
    console.log '2', @scoped, msg

    @ null, 'diff2'
  (err, msg) ->
    console.log '3', @scoped, msg
)

console.log 'gone', @scoped

###
$ coffee step-test.coffee
1 mine
2 mine diff1
3 mine diff2
gone undefined