That’s because it is an effect module. There is no documentation yet about
writing effect modules. Quite deliberately, I think.
​

2016-09-21 11:48 GMT+02:00 'Rupert Smith' via Elm Discuss <
elm-discuss@googlegroups.com>:

> On Tuesday, September 20, 2016 at 2:03:49 PM UTC+1, Rupert Smith wrote:
>>
>> The docs around the basics of syntax don't really cover this:
>> http://elm-lang.org/docs/syntax#type-annotations
>>
>
> In the module declaration for Task there is a 'where':
>
> effect module Task where { command = MyCmd } exposing
>
> with MyCmd later declared to be a type:
>
> type MyCmd msg =
>   T (Task Never msg)
>
> then later we see command used like a function:
>
> perform onFail onSuccess task = command (T (map onSuccess task `onError` \x
> -> succeed (onFail x)))
>
> can someone explain what is going on here? I can't find any documentation
> on the use of 'where' in a module declaration.
>
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