Remove erroneous usages of List::union
#5585
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`union` on `List` is concatenation. Duplicates are not removed. Also `union` is deprecated in 2.13.
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| /** Union on lists seen as sets */ | ||
| def | (ys: List[T]): List[T] = xs ++ (ys filterNot (xs contains _)) | ||
| def | (ys: List[T]): List[T] = xs ::: (ys filterNot (xs contains _)) |
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Maybe we should do xs filterNot (ys contains _) ::: ys to always share the tail.
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Maybe. I did't want to change the semantic. Maybe ordering matters.
I suggest trying out optimisations in another PR. Definitely worth investigating!
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uniononListis concatenation. Duplicates are not removed. Alsounionis deprecated in 2.13.