The error no_behaviour is raised by the virtual machine
operations
send() and get() if there is no implementation
for the requested selector on the requested object.
By changing the <-kind of this error,
not-implemented behaviour may be ignored (<-kind:
ignored); just printed (<-kind: warning)
or trap the tracer (<-kind: error). By
default, undefined behaviour is just printed. For program development we
advice to switch <-kind of this error to error.
This may be achieved using the Error Browser or using the
following line in your
~/.xpcerc:
:- send(error(no_behaviour), kind, error).
