bug#44612: Read standard input in `guix repl'

[Pierre Neidhardt]

If I understand correctly, "-t machine" is for when we want to retrieve
the results of all top-level evaluations.

If we only want specific results, then we are better off "passing" the
desired value to the caller by dumping them to the standard output.

For the latter, "-t machine" is not necessary I believe.

Is this correct?

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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