Re: I think thunked fields are breaking my previously working code

[Ricardo Wurmus]

edk@beaver-labs.com writes:

> For example, given that "minimal-container" is an operating system, I
> can do the following:
>
> (set-fields minimal-container ((operating-system-host-name) "toto"))
>
> But not:
>
> (set-fields minimal-container ((operating-system-label) "toto"))

In Guile we usually try to avoid mutation like that.  The records API
allows you to use inheritance instead:

  (operating-system
    (inherit minimal-container)
    (label "toto"))

Thunking just means that the field is a procedure that returns a value
when called with no arguments.  The records in (guix records) are not
plain SRFI9 records, so I would not expect set-fields to work at all.

-- 
Ricardo