See [https://github.com/nim-lang/Nim/blob/master/lib/system.nim#L438](https://github.com/nim-lang/Nim/blob/master/lib/system.nim#L438) and [https://github.com/nim-lang/Nim/blob/master/lib/pure/os.nim#L137](https://github.com/nim-lang/Nim/blob/master/lib/pure/os.nim#L137) for example
- How do I create and raise a custom exception? marksummerfield
- Re: How do I create and raise a custom exception? vega
- Re: How do I create and raise a custom exception? marksummerfield