```ruby
class Macvim < Cask
  url 'https://macvim.googlecode.com/files/MacVim-snapshot-66.tbz'
  homepage 'http://code.google.com/p/macvim/'
  version '7.3-66'
  sha1 'b2d28f7a33ac8eb4bbf899252b0d30669bd21406'
  link :app, 'MacVim.app'
end
```

Remove :app designation from MacVim link
user
```ruby
class Macvim < Cask
  url 'https://macvim.googlecode.com/files/MacVim-snapshot-66.tbz'
  homepage 'http://code.google.com/p/macvim/'
  version '7.3-66'
  sha1 'b2d28f7a33ac8eb4bbf899252b0d30669bd21406'
  link 'MacVim.app'
end
```
assistant