Closed
Description
When a user runs juliaup self channel, currently they get an error message that asks them for a channel but does not provide a list of valid/available channels. As the list is and is likely to remain quite short, it would be nice to include in the error message.
x@fedora:~$ juliaup self channel
error: the following required arguments were not provided:
<CHANNEL>
Usage: juliaup self channel <CHANNEL>
For more information, try '--help'.
x@fedora:~$ juliaup self channel nightly
Error: 'nightly' is not a valid juliaup channel, you can only specify 'release', 'releasepreview' or 'dev'.
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