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from std.containers let Collection
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from std.system.current-process let stderr
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let run`+entrypoint` does:
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nothing = { }
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things = { 42 }
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print-set-element things
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print-set-element nothing
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let print-set-element`Collection` elements`Collection, return : 1` does:
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with? element = ( ( elements.as-iterator ).next )
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do stderr "set element: {element}"
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