#56005 "write_wait_fd: unimplemented" error from 'guix substitute'

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From: Nathan Dehnel <ncdehnel@gmail.com>
Date: Sun, 23 Apr 2023 17:27:49 -0500
Message-ID: <CAEEhgEsVzvQZQ-Yc8wmoDdQBqiPc2PqTfV0GPShnFV171gXNeA@mail.gmail.com>
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 Content preview:  Can we please do a workaround for this until it is fixed?
 I can't leave my machines while they're updating and have to keep babying
 them, which is a massive waste of my time. Specific suggestion, this flag:
 --fallback fall back to building when the substituter fails This
 "unimplemented"
 error is a substituter failure, so if it fails it should fall back to building
 the pack [...] 
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