Error running self-update on `1.2.0-dev`

[bkhouri]

I installed 1.2.0-dev by running swift run swiftly init and swiftly self-update is failing with Error: No value set for non-argument var toVersion. Replace with a static variable, or let constant.

❯ git rev-parse HEAD
81a5d7840db9f349da5505945ee72a2d9e6d7a87

❯ swift run swiftly init
Fetching https://github.com/apple/swift-nio-http2.git from cache
<...SNIP...>
[1274/1274] Applying swiftly
Build of product 'swiftly' complete! (65.17s)
Installing swiftly in /Users/bkhouri/.swiftly/bin/swiftly...

❯ swiftly --version   
1.2.0-dev

❯ swiftly self-update
Error: No value set for non-argument var toVersion. Replace with a static variable, or let constant.
Usage: swiftly self-update [--assume-yes] [--verbose]
  See 'swiftly self-update --help' for more information.