Hi,
> 4. if neither ad-hoc nor inputs-of present then
>   a. if GUIX_ENVIRONMENT_DEPRECATED is 1: do the current behaviour,
>   b. if GUIX_ENVIRONMENT_DEPRECATED is undefined, or is not 1: do the
> new behaviour.

One remark:

I suggest the test to be "set to a non-empty string" resp. "unset or empty".

This is the way many programs to such checks.
In shell this would be `[ -n "$VAR" ] ` and `[ -n "$VAR" ]`.

-- 

Regards
Hartmut Goebel

| Hartmut Goebel          | h.goe...@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |


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