On Mon, 20 Jun 2022, Elijah Stone wrote:

Actually, it needs to be a suffix.  That's the issue.

   7 9 ''}i.2 2

Thinking about the issue a little bit more: using an empty list for m, it could have been intended as an array of k-indices for any k<$$y, meaning that the shape of the result from indexing could be any prefix of $y. So if 0-:*/$m, then the amend is legal (and a no op) if and only if +./($x) E. ($m),}.$y.

Thoughts?
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