Or at least, that's what I surmise from the fact that buildfarm critter
caiman has been failing that test for the last day or so, with symptoms
indicating whitespace changes in Data::Dumper output. Some poking into
the Fedora repo shows that rawhide updated perl-Data-Dumper from 2.161
to 2.167 on May 11, so that fits ...
regards, tom lane