Leo Famulari <leo@famulari.name> writes:

> Can you send your config.scm? 
>
> Without it, it's hard to know if there is a problem with your config.scm or the Guix mapper-devices code.
>

As requested here is my config.scm.  Although I doubt there is a problem
with it since it works with commit
de2032b912ede1756290e7ca9f7af7e9b72627eb and the mapped-devices
declaration is the same as in the manual (except for the target and the
uuid).