The golang-github-cznic-b package was last uploaded on 2018-02-11 and
appears unmaintained.  It has no reverse dependencies in Debian.

https://tracker.debian.org/pkg/golang-github-cznic-b

The upstream project was archived in 2018:

https://github.com/cznic/b

This removal request is part of a larger batch to remove 100+ unused
golang-*-dev packages from Debian.  I believe the QA cost associated
with keeping all of them is larger than the cost of (hopefully extremely
rare) re-introduction of any accidentally removed package if there is
ever any future need for it.  Meanwhile, I don't think it is useful to
keep this package in Debian.

/Simon

jas@frallan:~/dpkg/golang-qa-find-zombies$ ssh mirror.ftp-master.debian.org dak rm -Rn golang-github-cznic-b
Will remove the following packages from unstable:

golang-github-cznic-b | 0.0~git20151027.0.01b13d7-2 | source
golang-github-cznic-b-dev | 0.0~git20151027.0.01b13d7-2 | all

Maintainer: Debian Go Packaging Team <pkg-go-maintainers@lists.alioth.debian.org>
------------------- Reason -------------------

----------------------------------------------

Checking reverse dependencies...
No dependency problem found.

jas@frallan:~/dpkg/golang-qa-find-zombies$