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Improving efficiency and compatability of traverse implementation #221

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merged 1 commit into from
Oct 9, 2018

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recursion-ninja
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This pull request is a partial fix for #220. It addresses an incompatibility defect between vector and ghc-compact.

The new traverse implementation is strictly more efficient and more compatible.

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Is there a time line for merging this? I'd like it to be able to use the Traversable instance of Vector in conjunction with Compact Regions as soon as possible. Is there anything else required for this to be merged?

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cartazio commented Oct 9, 2018 via email

@cartazio cartazio merged commit 12c608d into haskell:master Oct 9, 2018
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cartazio commented Oct 9, 2018

ok, this looks like a good fix for me, i've merged it into master,
i'll see about doing a bug fix release for that later this week
(got a bit of travel next few days)

Q: do we fundamentally need the from/to lists here? I feel like there must be some clever way to do stream fusion here, though i suppose that would mess with applicative not being strict ..

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@cartazio I can't comment on if there is a more clever way to implement traverse to invoke better stream fusion. I don't know the internals of the library well enough. I just know that calls to fromList will cause run-time exceptions when the resulting vector is used in a compact region, so I replaced fromList with fromListN.

I look forward to the bug fix release, hopefully this week!

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@cartazio any ETA on the bug fix version being uploaded to hackage?

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derp, got a bit buried with some travel then being ill for a span, putting it back on top of the queue

cartazio pushed a commit that referenced this pull request Nov 14, 2018
…oxed vectors. (gh pr #221, fixes bug #220)

previously traverse used unknown size fromList rather fromListN for constructing Boxed vectors.
In the presence of compact regions the implementation strategy for fromList results in program crashes. Now traverse on Boxed vectors uses the input vector size for constructing the result vector.
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Hey, can we get a new version of vector uploaded to hackage with this improvement.

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cartazio commented Dec 7, 2018 via email

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cartazio commented Dec 7, 2018 via email

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cartazio commented Dec 7, 2018

https://hackage.haskell.org/package/vector-0.12.0.2/candidate is the candidate
please confirm it fixes your issue :)

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cartazio commented Dec 7, 2018

once i get https://travis-ci.org/haskell/vector/builds/465105124 green i'll do the release

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cartazio commented Dec 7, 2018

released!

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