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josevalim
commented
Sep 27, 2026
| # | ||
| # If the collectable may also be a list, the body may be valid | ||
| # on that path, so we only error when the list path is impossible. | ||
| if empty?(intersection) and :non_empty_list not in into_kinds do |
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I think we can remove the TODO above because I believe it is talking about exactly this case!
josevalim
commented
Sep 27, 2026
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| cond do | ||
| # A comprehension may concatenate the block an arbitrary number of times. | ||
| # Even if both the initial value and each block are unaligned bitstrings, | ||
| # repeated concatenation may eventually produce an aligned binary. | ||
| bitstring_type?(type) and empty_list_type?(type) -> |
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Let's convert this into a case {bitstring_type?(type), empty_list_type?(type)}.
josevalim
commented
Sep 27, 2026
| [flag], | ||
| ( | ||
| into = if flag, do: [], else: "" | ||
| for(_ <- [1], do: :ok, into: into) |
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This should not type check in the static version. It would type check in the dynamic one.
josevalim
commented
Sep 27, 2026
| ( | ||
| into = if flag, do: [], else: "" | ||
| value = if flag, do: :ok, else: "ok" | ||
| for(_ <- [1], do: value, into: into) |
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I don't think this should type check in the static version either. Because if you write it as value = if !flag, it will fail, and the type system would accept it.
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