using an SRFI that is not available in Guile

[Attila Lendvai]

dear Guixers,

when working on the (gnu services configuration) module, i would like to use srfi-189, which is not available in Guile (https://srfi.schemers.org/srfi-189/srfi-189.html).

is there any way to add it, or an already established custom for such a situation? e.g. adding the .scm file to Guix, preferrably late in the load order, until Guile catches up and shadows it with its own?

- attila

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