coverage 7.0.0 does a glob-to-regex transform that explicitly disallows + characters. Our pathnames when using eups distrib often contain such characters, as they're part of the eups version. Nightly clean builds of lsst_distrib don't have this problem as they're built in directories without the +.

The .coveragerc specification in afw triggers this, as its omit pattern doesn't start with a wildcard and thus has the absolute pathname prepended to it.

The safest course appears to be to pin to <7.