Drastic Prelude changes imminent

[David Feuer]

I'm trying to understand why people with (serious, legitimate)
concerns about BBP didn't come out of the woodwork until RC2. I fear
it's likely that nothing can be done to change this until 7.12 in any
case.

For the record, I'm not a huge fan of the Foldable abstraction myself;
I just don't think now is a good time for that discussion.

On Tue, Jan 27, 2015 at 11:35 AM, Yitzchak Gale <gale at sefer.org> wrote:
> First of all, I am very strongly in favor of Lennart's proposal
> of slowing down the BBP.
>
> This discussion is now moving in the direction of changes or
> alternatives to BBP itself. That is a worthwhile discussion,
> but it's not practical until we first come to a conclusion about
> Lennart's original proposal. For now, what is on the table is
> to find a way to swap BBP, exactly as it is now, in or out
> using some simple mechanism like a pragma.
>
> The proposed syntax LANGUAGE Prelude=AlternativePrelude
> is nice, but the difficulty in finding a Proposal 3 shows that
> this syntax is not good enough. We need a combined
> Proposal 1 and Proposal 3 that works something like this:
>
> The base package comes with two versions of each of
> the affected modules. Something like this:
>
> Prelude.Traditional
> Prelude.Alternative
>
> Data.List.Traditional
> Data.List.Alternative
>
> etc.
>
> Then we need some simple mechanism - a LANGUAGE
> pragma, or whatever - that swaps all at once which of
> the two sets are re-exported by the standard modules.
>
> -Yitz
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