Proposal: Add foldrWithIndex and foldlWithIndex to Data.List

[David Feuer]

Actually, that proposal is firmly in the past. Let's *move* foldrWithIndex
and foldlWithIndex from Data.Sequence to Data.Foldable!

On Thu, Oct 16, 2014 at 1:14 PM, David Feuer <david.feuer at gmail.com> wrote:

> These functions can be lifted pretty much straight out of Data.Sequence.
> In particular, foldrWithIndex makes for a particularly nice expression of a
> fusing findIndices function, as is present in Data.Sequence.
>
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