[core libraries] Dropping support for NHC98 and old GHC from containers

[Edward Kmett]

We did a similar cleanup pass on base a year or two back.

No objection here.

Code you can't test is kinda hard to maintain forever.

-Edward

On Mon, Apr 25, 2016 at 2:38 PM, David Feuer <david.feuer at gmail.com> wrote:
> The containers package currently includes CPP and Cabal directives
> intended to support NHC98 and versions of GHC before 7.0. However, our
> TravisCI script tests only GHC versions 7.0 and above. It is therefore
> likely that the compatibility code is bit-rotted to some extent. Wren
> Romano and I are strongly inclined to immediately remove all code
> intended to support NHC98 or pre-7.0 GHC. If anyone uses any such
> implementations with the current version of containers, please speak
> now or forever hold your peace.
>
> Thanks,
> David Feuer
>
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