Re: using an SRFI that is not available in Guile

[Attila Lendvai]

> How about using ‘*unspecified*’ in those cases?


hrm, that looks interesting, thanks! i'll try using that first. it's
Guile-specific, but then most of the rest of Guix is...


> Out of curiosity, in what case do you need to represent “unset fields”?


i think an example works better here: consider Swarm, a p2p storage
solution. its node implementation is called Bee. bees can join
swarms. there are some well-known swarms: 'testnet' and 'mainnet'.

when someone specifies the swarm field as a symbol naming one of the
well-known swarms, then some other mandatory fields should default to
the appropriate values derived from it, *and* the service should warn
if those fields are also set by the user.

and when one is joining a custom swarm, as per giving a string name in
the swarm field, then the service should warn when these mandatory
fields are not explicitly specified.

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• attila lendvai
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“We read the world wrong and say that it deceives us.”
        — Rabindranath Thakur, aka Tagore (1861–1941)