How to globally replace core binding?

[Tomas Volf]

Hello,

I would like to replace a core binding.  I know that I can define a module like
this:

    (define-module (foo))
    (define-public (copy-file a b)
      (display "TODO: implement file copy\n"))

And I can later use it

    scheme@(guile-user)> ,use (foo)
    scheme@(guile-user)> (copy-file 'a 'b)
    TODO: implement file copy

But!  I would like to replace the copy-file globally, for all modules, without
the need to explicitly import it.  I guess I want something in the spirit of the
`install-suspendable-ports!', so that I could do something like:

    scheme@(guile-user)> ,use (foo)
    scheme@(guile-user)> (install-better-copy-file!)

I could patch the Guile itself, but I would strongly prefer to avoid that, for
obvious reasons.  So, is it possible to achieve what I want, and if so, how?

Thank you and have a nice day,
Tomas

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

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