Small Proposal "!in"

[Mike Samuel]

On Thu, Jul 19, 2018 at 10:40 AM Augusto Moura <augusto.borgesm at gmail.com>
wrote:

> Of couse the usage of `in` is most of the time is not recommended, but it
> has it place.
>

What places does it have?
I remain unconvinced that `in` has significant enough use cases to warrant
high-level ergonomics
were it being proposed today.

It exists, and it'll probably never be removed from the language, but I
don't think it should be taught
as a good part of the language, and linters should probably flag it.
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