SYNOPSIS
        void raise_error(string arg)

DESCRIPTION
        Abort execution. If the current program execution was
        initiated by catch(), that catch expression will return arg as
        error code, else the arg will printed as error message.         This
        is very similar to throw(), but while throw() is intended to
        be called inside catch(), raise_error() can be called
        anywhere.

SEE ALSO
        catch(E), throw(E)