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More simplifications for field selection - #1174
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…as standardized in dhall-lang/dhall-lang#664.
| Just v -> pure v | ||
| Nothing -> Field <$> (RecordLit <$> traverse loop kvs) <*> pure x | ||
| Project r_ _ -> loop (Field r_ x) | ||
| Prefer l (RecordLit kvs) -> case Dhall.Map.lookup x kvs of |
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I think what you want to do here is use a pattern guard, like this:
Prefer l (RecordLit kvs) | Just v <- Dhall.Map.lookup x kvs -> pure v
Prefer (RecordLit kvs) r_ | not (Dhall.Map.member x kvs) -> loop (Field r_ x)
…The reason I suggest this is that if you handle the case for Nothing here then the normalizer won't attempt other simplifications.
Same comment for Dhall.Eval
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Are you sure? Actually the case for Nothing is also an important simplification and calls loop on the simplified expression…
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Oh whoops, I misread this. You're right
Gabriella439
approved these changes
Jul 31, 2019
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…as standardized in dhall-lang/dhall-lang#664.