let procName: string = $procDef.name
  if routes.hasKey(procName):
    let otherProcLine: string = routes[procName].lineInfo
    error(fmt"`The {procName} proc could not be registered with appster. A proc
with that name was already registered! Previous proc here: {otherProcLine}",
procDef)
  ```
Went with that.

If I could get that to do line breaks without becoming hyper ugly I'd love it