tree cfc551343a520a6f6bc2c219094c93b1798e1a41
parent 835ed58da9c40cc0c1b1c71750bbaf1d42bcd8f9
author Marcel van Lohuizen <mpvl@golang.org> 1567680761 +0200
committer Marcel van Lohuizen <mpvl@golang.org> 1568131467 +0000

cue: tighten API of comprehensions

When *bottom implemented error, it was a bad idea
to return it as an error (nil-interface issue).
Not it does not, it can safely be done while improving
the API.

Change-Id: Ie6451fca4172cf408de9e0f58d7931a9d7344450
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3182
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>