Optimize subtype? by aborting early #14561
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In the same way we introduced non_disjoint_intersection to optimize compatibility, we introduce empty_difference to optimize subtyping.
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sabiwara
reviewed
Jun 7, 2025
| @@ -464,6 +464,26 @@ defmodule Module.Types.Descr do | |||
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| defp iterator_difference_static(:none, map), do: map | |||
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| defp empty_difference_static?(left, :term), do: not Map.has_key?(left, :optional) | |||
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@josevalim sorry asking for my understanding, couldn't figure this one out.
What would be an example case that justifies checking for optional?
Currently the following seems to pass all the tests, so it's probably not covered:
- defp empty_difference_static?(left, :term), do: not Map.has_key?(left, :optional)
+ defp empty_difference_static?(left, :term), do: trueThere was a problem hiding this comment.
I don't think there is a practical example, but i am keeping semantic equivalence with the empty? function. empty? check if all fields empty and, if optional is set, it is not considered empty. So I am doing the same here. I have asked @gldubc if empty?(optional(none()) is true or false.
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In the same way we introduced
non_disjoint_intersectionto optimize compatibility, we introduce
empty_differenceto optimize subtyping.