[ghc-steering-committee] Deprecating Exports (#134); Recommendation: accept

[Iavor Diatchki]

I have a bunch of question about this proposal, but I wrote them on the
proposal discussion page, as this is what folks asked for, last time I had
some questions.   I think answering them would make the proposal more
clear.

It seems to me that the use of this extension is somewhat limited, but it
could be useful on occasion so I could take it or leave it.    It's been a
while since I've looked at the GHC source, but I don't think that
implementing this would be completely trivial, as I don't thing GHC
currently cares about *how* names came to in scope, just what they refer
to.   But, I believe this is usually not a big factor in our discussions,
just though I'd mention it.

-Iavor




On Thu, May 24, 2018 at 3:23 AM Joachim Breitner <mail at joachim-breitner.de>
wrote:

> Hi,
>
> alanasp has proposed a Deprecating Exports mechanism:
>
> https://github.com/alanasp/ghc-proposals/blob/patch-2/proposals/deprecating_exports_proposal.rst
>
> The gist is explained by this:
>
>    module Data.List
>    (  ...
>        {-# DEPRECATE lines "Exported from Data.String instead" #-}
>        , lines
>        ...t
>    ) where
>
> i.e. DEPRECATE pragmas in export lists cause warning when some other
> module uses the deprecated symbol when it is imported (only) via some
> deprecated export.
>
> This is a GSOC 2018 project, mentored by Matthew Pickering and Erik de
> Castro Lopo.
>
> The feature has a clear use-case, is self-contained and David Feuer
> (the containers maintainer) has already confirmed that there is a real
> demand for this. I suggest acceptance!
>
>
> As always, I will understand silence as tactic consensus.
>
> Cheers,
> Joachim
>
>
> --
> Joachim Breitner
>   mail at joachim-breitner.de
>   http://www.joachim-breitner.de/
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