Reported on zulip by Kim.

$ pijul init p1
$ cd p1
$ touch a
$ pijul add a
$ pijul rec -am"."
Hash: H3H3FPAZ3QRZQ3DPGNFVV6TQQ5RJASFT6MPHMGTN3PLN5ZSYBBJAC
$ touch b
$ pijul add b
$ pijul rec -am"."
Hash: SCFQBRUGWHSSM6Z3O7BRBLP3POCT3UUMTWX2IWXRBSJ4ENL4D5TQC
$ pijul tag create -m"."
TGFWCAUK7UV6E5PWNOKF4FWQLHPSJIHCA3D7YPWTQE52HZEDHOPAC

$ pijul unrec H3
$ pijul tag
Error: No such file or directory (os error 2)
$