If you want a SSCCE, here it is:
https://ellie-app.com/M5sydznVwXa1/0
This is what you might be doing (the equivalent, of course).
On Wed, Mar 29, 2017 at 9:32 AM, Mark Hamburg <mhamburg...@gmail.com> wrote:
> I've now seen something like this a few times. The last time I tried to
> build an SSCCE, the bug went away when I looked more closely so I expect to
> get nasty messages from the bug submission system if I try to report it as
> is, but I figured I would see whether anyone else has seen anything like
> this in an effort to narrow in.
>
> This Elm code
>
> operationHandlers : List (Operation.Op Msg -> Maybe Updater)
> operationHandlers =
> [ handleAccountOperation
> ]
>
> handleAccountOperation : Operation.Op Msg -> Maybe Updater
> handleAccountOperation op =
> case Debug.log "handleAccountOperation" op of
> Operation.Account accountID accountOp ->
> applyAccountOperation accountOp
> |> Maybe.map (updateAccount accountID)
> _ ->
> Nothing
>
>
> produces this JavaScript
>
> var _adobe$adlproj$App_SessionData$operationHandlers = {
> ctor: '::',
> _0: *_adobe$adlproj$App_SessionData$handleAccountOperation*,
> _1: {ctor: '[]'}
> };
> var _adobe$adlproj$App_SessionData$handleAccountOperation = function (op)
> {
> var _p5 = A2(_elm_lang$core$Debug$log, 'handleAccountOperation', op);
> if (_p5.ctor === 'Account') {
> return A2(
> _elm_lang$core$Maybe$map,
> _adobe$adlproj$App_SessionData$updateAccount(_p5._0),
> _adobe$adlproj$App_SessionData$applyAccountOperation(_p5._1));
> } else {
> return _elm_lang$core$Maybe$Nothing;
> }
> };
>
>
> Note the problem in bold: At the point where we construct the list, we
> have not initialized the variable being stored in the list. When we then
> try to call the function at the head of the list, we get informed that it
> isn't a function. Boom.
>
> Reversing order does not fix this (and should not be required to fix this).
>
> Mark
>
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