SYNOPSIS
        mixed heart_beat_error(object culprit, string err, string prg,
                               string curobj, int line)

DESCRIPTION
        This function is called when a runtime error occurs while
        executing the heart_beat() function of the object culprit. prg
        is program where the actual error happened, in object curobj
        at the given line.

        At time of call, the heart_beat has been turned off.
        Return anything != 0 to restart the heart_beat in culprit.

        If culprit is a user, it should at least get the message ``You
        have no heartbeat''. A more advanced handling would destruct
        the offending object curobj and and allow the heartbeat to
        restart.

        Note that prg denotes the program actually executed (which
        might be an inherited one) whereas curobj is just the
        offending object.

SEE ALSO
        set_heart_beat(E), heart_beat(A), runtime_error(M)