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

[Tobias Geerinckx-Rice]

The point is that people shouldn't have to resort to gross 
not-even-POSIX hacks just to get rid of this message.  Imagine 
typing

 ... | grep x /dev/stdin | uniq /dev/stdin | wc /dev/stdin

Kind regards,

T G-R

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