When moving to version 3.0.0, I get the following warning for

Starting compilation server

[warn] ./scripts/helper.sc:277:40
[warn] Infinite loop in function body

for this code:

given rwConfigType: ReadWriter[ConfigType] = macroRW, where ConfigType is defined as:

enum ConfigType:
  case Config, ConfigStructural, StateAppliedConfig, StateDerived, StateStructural, Unknown

, which I can confirm at run time that the compile warning is indeed correct ;-).

Deleting the given and adding a "derives ReadWriter" fixes the issue, but thought that it would be helpful to flag this.