Bug: (for X previous Y ...) does not check existence of Y

[Ilya Perminov]

Hello,


Iterate silently ignores "for ... previous" clauses that reference undefined variables, e.g,

(iter (repeat 2)
   (for x previous y initially 0)
   (collect x))

returns (0 0).


A patch to fix the bug is attached. Can someone apply it please.


Thanks,

Ilya

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