[m-rev.] diff: add list.map_corresponding/4

[Ben Schmidt]

> Add a predicate version of list.map_corresponding/3.

A little unclear. Would be better if it were more like the one in NEWS:

> +* We have added list.map_corresponding/4, a predicate version of +  
> list.map_corresponding/3.

Looks good apart from that.

Ben.


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