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Apologies for the delay - in a shocking twist, it turns out professors
insisting on only one exit from functions had a point, and trying to
fully understand what optimisePath_, with its 14 exits and a goto, does,
was a challenge. I think I handle most of the main error cases (EEXIST,
ENOSPC, EMLINK) sort of okay now (the "shrug and ignore" sort of
exceptions are now caught, the rest are still propagated). I've also
created guix/store/deduplication.scm, and moved the relevant stuff
there. The tests pass to the same degree as before (2 failing, but
neither of them are register-path).

Here is my test-suite.log: