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authorKaz Kylheku <kaz@kylheku.com>2021-12-02 08:24:28 -0800
committerKaz Kylheku <kaz@kylheku.com>2021-12-02 08:24:28 -0800
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tuples: change to abstract iteration.
* lib.c (make_like): In the COBJ case, recognize an iterator object. Pull out the underlying object and recurse on it. This is needed in tuples_func, where make_like will now be called on the abstract iterator, rather than the actual sequence object. (tuples_func): The incoming object is now an iterator, and not a sequence; we need to handle it with iter_more, iter_item and iter_step. (tuples): Instead of nullify, begin iteration with iter_begin, and use iter_more to test for empty. In non-empty case, put propagate the iterator thorugh the lazy cons car field, rather than the sequence.
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