[swift-evolution] Using "where" to filter an array

[Charles Constant]

I noticed several weeks ago that the following is illegal:

    let new_arr = el in arr where el.is_foo // illegal

I assumed it would work because it's consistent with the filtering that
exists in a "for" loop, i.e.:

    for el in arr where el.is_foo // legal

Is this "new proposal" material? I thought I would check in case it's
already on the roadmap, or inherently wrong.
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