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Re: using a module : rename a single definition

From: Tomas Volf
Subject: Re: using a module : rename a single definition
Date: Sun, 3 Mar 2024 12:50:09 +0100

On 2024-03-03 09:46:41 +0100, Damien Mattei wrote:
> hello,
> is it possible to import a module having just one variable renamed (not
> all) , as in Racket:
> (require (rename-in srfi/42
>              (: s42:))) ; Eager Comprehensions
> it seems in Guile either all is imported and prefixed or only a selection
> of bindings can be imported:
> (use-modules ((ice-9 popen)
>               #:select ((open-pipe . pipe-open) close-pipe)
>               #:prefix unixy:))
> regards,

There does not seem to be a way to *exclude* a single symbol from the import,
but, if you do not mind having *also* the original symbol (or if you will just
override it later with something else anyway), it seems you can do something
like this:

    (use-modules (ice-9 popen)
                 ((ice-9 popen) #:select ((open-pipe . foo-bar))))

After that you have both `open-pipe' and `foo-bar' available, pointing to the
same procedure.  At this point you could just re-define `open-pipe' to something
else and use the `foo-bar'.

Maybe there is a better way, but I did not find it in the manual.

Have a nice day,
Tomas Volf

There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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