Bug#942673: warn about b-d on python3-all-dev and package not building for all supported python versions
Package: lintian
please warn about b-d on python3-all-dev and package not  building for all 
supported python versions.  Not sure if that's implementable, because you can 
only warn about that when there are currently multiple supported python3 
versions (like in python3-defaults in experimental). Or can you reference the 
buildinfo file for that?
Examples which I found so far:
jsonnet
ldb
apparmor
libkdtree++
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