Add traverseWithIndex to Data.Sequence

[John Wiegley]

>>>>> David Feuer <david.feuer at gmail.com> writes:

> I just realized there *is* a way to implement traverseWithIndex reasonably
> efficiently with the current interface:

> traverseWithIndex f = sequenceA . mapWithIndex f

> I still think it's a good thing to add though.

+1

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
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