That's OK. Ofcourse it does mean that code written for a base with this included won't work with an older base and hence older compiler. But things have been added to base before, so it's not a new situtation.

2016-04-13 8:25 GMT+02:00 Henning Thielemann <lemming@henning-thielemann.de>:

On Wed, 13 Apr 2016, Johan Holmquist wrote:

I am proposing inclusion into base to make it readily available out of the box. I think it would fit rather well together with the other zips in Data.List.

It's only out-of-the-box for a recent GHC. You will exclude any older compiler just because of this simple function.

If 'base' would be separate from GHC this would be no issue.