Glenn Morris wrote:
> Package: emacs
> Severity: minor
> Version: 27.0.50
> 
> Somewhere between 3548fd8 and 96ef76e (inclusive),
> mod-test-add-nanosecond/valid began failing.
> 
> Ref eg
> https://hydra.nixos.org/build/98764057
> https://hydra.nixos.org/build/98750439


Thanks for reporting that. It should be fixed by commit 
2019-08-16T23:25:02Z!eggert@cs.ucla.edu (attached) so I'm boldly closing the bug 
report.

On a related topic, perhaps tests shouldn't depend on time-of-day? That kind of 
phase-of-the-moon stuff can make maintenance difficult - though, as it happened, 
it wasn't a problem this time as I discovered and fixed the bug before reading 
your bug report.