This was not formatted in erlang.el's (erlang-mode) style (see [CONTRIBUTING#code-style](https://github.com/rebar/rebar/blob/fa1a2b53fd66ae833586729a2122a31ac1f29b0b/CONTRIBUTING.md#code-style)). If you reformat it as is with erlang.el, then `{_, AppName} = rebar_app_utils:app_name(Config, AppFile)` will exceed the column width limit.