Proposal (Trac ticket #3671): Add takeRec, genericTakeRec and spanRec to Data.List

[Yitzchak Gale]

Ian Lynagh wrote:
>>    breaks (',' ==) "123,456,,78" == ["123", "456", "", "78"]

I wrote:
> runs = groupBy . on (==)
> breaks p = filter (not . p . head) . runs p

Except that has slightly different semantics than Ian's:

breaks (',' ==) "123,456,,78" == ["123","456","78"]

-Yitz