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Line 921: Note also http://www.jsoftware.com/pipermail/general/2003-August/015571.html which points out that the form <lang j>basis ` ($: @: g) @. test</lang> is an anonymous form matches the "tail recursion" pattern. ~~However,~~but ~~J does~~is not automatically ~~perform~~transformed to satisfy the classic "tail recursion optimization". ~~which~~That optimization would be implemented as transforming this particular example of recursion to the non-recursive <lang j>basis @: (g^:test^:_)</lang> Of course, that won't work here, because we are adding two recursively obtained results where tail recursion requires that the recursive result is the final result.

Anonymous recursion (view source)