On 1/22/2019 0:17 AM, Henry Rich wrote:
> Opening (,<0$a:) produces a empty list of boxes, which behaves
> differently as the left argument to { than an empty numeric list.

Thank you, Henry and Bill. I've forgot about useful foreign 5!:5 and relied 
too heavily on match result. Now the reason of the error is clear to me.

-- 
Regards,
Igor


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