forCapture.coffee

for f, index in files
  extname = path.extname f
  fs.lstat f, (err, stats) ->    
    if !stats.isDirectory() and extname is '.coffee'
      fs.readFile f, 'utf8', compileCallback
    else if stats.isDirectory()
      readDirAfterThisOne = ->
        if index is files.length - 1 then clearInterval(h) and processDir(f)
      h = setInterval readDirAfterThisOne, 50

# In order for this to work reliably, f and extname would have to be captured, but index would have
# to *not* be captured, so that the readDirAfterThisOne closure can work. Here's how this would be
# written with the proposed `do` syntax:

for f, index in files
  extname = path.extname f
  do (f, extname) ->
    fs.lstat f, (err, stats) ->    
      if !stats.isDirectory() and extname is '.coffee'
        fs.readFile f, 'utf8', compileCallback
      else if stats.isDirectory()
        readDirAfterThisOne = ->
          if index is files.length - 1 then clearInterval(h) and processDir(f)
        h = setInterval readDirAfterThisOne, 50