.. efun:: void raise_error(string arg)

  Abort execution. If the current program execution was initiated by :efun:`catch`, that catch expression will return arg as error code, else the arg will printed as error message.

  This is very similar to :efun:`throw`, but while :efun:`throw` is intended to be called inside :efun:`catch`, :efun:`raise_error` can be called anywhere. Furthermore, :efun:`raise_error` includes the complete error handling with generation of a stack backtrace, making it a very expensive function.

  .. seealso:: :efun:`catch`, :efun:`throw`