Verify the late-failing implementation of lookup - #188
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in issue haskell/containers#794 and PR haskell/containers#800 an alternative implementation of `lookup` is proposed which checks if the key is as expected only when reaching the leaf. This means less branching in the success case or when the lookup key shares long prefixes with existing values, but may do more work when the lookup key is far away from existing keys. Not saying that it’s particularly doubtful that the changed code is correct, but since we have the machinery, why not verify it? So here we go, and yes, it goes through. I don’t think we need to merge the PR like this, and can probably wait for the code to reach a containers release, and then include it there. Also, this PR currently contains a bunch of local hacks that I used to get going again (now that I use NixOS), which need to be removed, merged separately, or made obsolete by better changes to the setup.
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haskell/containers#800 got merged, so maybe we should merge this too |
nomeata
marked this pull request as ready for review
July 15, 2022 15:38
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Ah, maybe not: As I said in the PR description, we should just update the version of containers that we verify |
nomeata
marked this pull request as draft
July 15, 2022 15:40
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The newer version of |
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in issue haskell/containers#794 and PR
haskell/containers#800 an alternative
implementation of
lookupis proposed which checks if the key is asexpected only when reaching the leaf. This means less branching in the
success case or when the lookup key shares long prefixes with existing
values, but may do more work when the lookup key is far away from
existing keys.
Not saying that it’s particularly doubtful that the changed code is
correct, but since we have the machinery, why not verify it? So here we
go, and yes, it goes through.
I don’t think we need to merge the PR like this, and can probably wait
for the code to reach a containers release, and then include it there.
Also, this PR currently contains a bunch of local hacks that I used to
get going again (now that I use NixOS), which need to be removed, merged
separately, or made obsolete by better changes to the setup.