Getting index within Each Helper

This works in Handlebars:

{{#each array}}
    {{@index}}: {{this}}
{{/each}}

This fails in Emblem:

ul
  each App.things
    li {{@index}}

I get this error: Uncaught Error: Emblem syntax error, line 1: Expected BeginStatement or DEDENT but "=" found. =@index

Perhaps this is not an issue, but I thought Emblem was intended to behave functionally like Handlebars.

[dishcandanty]

In case anyone runs into it today and finds this like I did:

each list as |item index|
      = index

[machty]

Thanks @cbellino for digging in 😃