> At present I can get cligen things (like that example bench above) to compile > and run ok, but with gc:arc invoking with --help raises a HelpOnly exception > that then dumps core. Current runtime seems to think the exception is > unhandled. (Haven't looked into it further.)
[https://github.com/nim-lang/Nim/issues/10288](https://github.com/nim-lang/Nim/issues/10288) My guess is that `--exception:goto` will abort on `Defect` instead of trying to handle it, and `Exception` inherits `Defect`. Try rebasing your types to `CatchableError` instead.
