haskell-decl-scan-mode fails while updating imenu

[patrickt]

As of haskell-mode 20150823.2218, attempting to turn on haskell-decl-scan-mode fails with the following message:

Error in menu-bar-update-hook (imenu-update-menubar): (void-variable index-imp-alist)

I'm running emacs 24.5.1 on OS X.

[ivan-m]

I've just noticed this as well.

[gracjan]

This:

(symbol-value SYMBOL)

Return SYMBOL's value.  Error if that is void.
Note that if `lexical-binding' is in effect, this returns the
global value outside of any lexical scope.

And it is used here:
https://github.com/haskell/haskell-mode/blob/master/haskell-decl-scan.el#L502

Any takers to fix this one?

[vlatkoB]

Not sure what that sym does (doesn't seem to be used anywhere), but I've tried with

 (if (boundp sym)
        (set sym (cons (cons name start-pos) (symbol-value sym)))))))

and at first glance seems fine.

I wouldn't like to make a PR as I do not know what that is and are there any hidden consequences.

[gracjan]

We need to change this into cond or case.

[patrickt]

Thanks so much ❤️