For example, consider:

https://ci.guix.gnu.org/build/1865837/details

.

This is a (failed) build of the gwl@0.5.1 package, with dependency 
guix@1.4.0-....

It looks like the test tests/publish.scm is functioning, i.e., it 
succeeded at detecting a bug:

make[4]: *** [Makefile:6303: tests/publish.log] Error 134

but that's a test of the (successful!) Guix package, not gwl!   It 
appears that Cuirass is missing some topological sorting of dependencies 
somewhere.