fix for Data.List.sortBy

[David Feuer]

There are a number of intermediate lists that are certainly non-empty, but
their types don't reflect that. I wonder if using a non-empty list type
unpacked into the list of lists might be helpful.

On Mar 28, 2017 3:39 PM, "Gregory Popovitch" <greg7mdp at gmail.com> wrote:

> OK, here is the current proposed change - tests look good:
>
>
> Any comments/opposition from the community?
>
> Thanks,
>
> greg
>
>
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