Incompatability with `symbol-fstring`
An incompability exists with https://github.com/Shopify/symbol-fstring. I'm not sure if the bug is in this gem or that one, but it's easier to make a test case here and I think the bug is here.
The attached test fails, but it passes if you remove the extra gem. It fails because with the gem, const_name is frozen? here. As a result this line raises a FrozenError, and that gets handled here.
This is only an issue when loading a namespaced constant.
I've only made a test case as I don't really know how to fix it :(
cc @byroot in case this is an issue in symbol-fstring (I doubt that) or in case you have some good ideas on how to fix this.
https://github.com/basecamp/console1984/blob/f0f2efd489b94be8bbc9bcfb6bff778be3885d78/lib/console1984/command_validator/.command_parser.rb#L43
const_name is a symbol here, so Symbol#to_s returns a frozen string when symbol-fstring is present, which is expected.
Amusingly that the first ever recorded incompatibility I'm aware of with it, but as I said, totally expected as it's a monkey patch that changes the behavior.
As for fixing it, explictly using const_name.name.dup would work.