I 100% understand the motivation and agree with it. But an optional compiler flag would be nice for development, instead of the special syntax that has to be applied per unused identifier.

And I just don't get why the compiler has to throw an error about a formatting preference when the builtin formatter already changes it accordingly. Any serious project can just mandate use of the formatter to keep things consistent and be done with it. Instead the github issues have people debate tabs vs spaces because the compiler took a side in order to end the "bikeshed of all bikesheds", ironically contributing to it.