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Fix isNormalized for field selections - #1210
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In expressions like
({ x : Optional/fold } // {=}).x
isNormalized didn't check if the expression being selected from
was normalized.
Fixes #1209.
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Gabriella439
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Aug 7, 2019
| Combine x@(RecordLit m) y -> loop x && loop y && Dhall.Map.member k m | ||
| Combine x (RecordLit m) -> loop x && Dhall.Map.toList (fmap loop m) == [(k, True)] | ||
| Prefer x@(RecordLit m) y -> loop x && loop y && Dhall.Map.member k m | ||
| Combine (RecordLit m) _ -> Dhall.Map.member k m && loop r |
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Perhaps move the loop r check above so that does not have to be repeated across the branches, like this:
Field r k -> loop r && case r of
RecordLit _ -> False
…
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I actually did that in a previous version of this fix, but I just couldn't handle the inefficiency! ;)
If you don't mind too much I'd slightly prefer to keep the fix as it is now.
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I don't mind! It was just a suggestion 🙂
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In expressions like
isNormalizeddidn't check if the expression being selected fromwas normalized.
Fixes #1209.