Use of uninitialized value in concatenation (.) or string at /usr/share/perl5/Devscripts/Uscan/WatchLine.pm line 868.
uscan warn: In debian/watch no matching hrefs for version 2.2.1 in watch line
https://github.com/brettwooldridge/SparseBitSet/tags .*/(?:.*?)([\d\.]+)\.tar\.gz
Looking for upstream 2.2.1 in upstream branch https://github.com/brettwooldridge/SparseBitSet.git/.
No upstream upstream-revision format specified, trying tag:2.2.1
No upstream upstream-revision format specified, trying tag:sparsebitset-2.2.1
No upstream upstream-revision format specified, trying tag:v2.2.1
No upstream upstream-revision format specified, trying tag:v.2.2.1
No upstream upstream-revision format specified, trying tag:release-2.2.1
No upstream upstream-revision format specified, trying tag:2_2_1_release
No upstream upstream-revision format specified, trying tag:2_2_1
No upstream upstream-revision format specified, trying tag:version-2.2.1
No upstream upstream-revision format specified, trying tag:sparsebitset-2_2_1-release
No upstream upstream-revision format specified, trying tag:sparsebitset-v2.2.1
brz: ERROR: Unable to find the needed upstream tarball for package sparsebitset, version 2.2.1.