Availability:built-in
 [ISO]haltTerminate Prolog execution with default exit code using halt/1. 
The default exit code is normally 0, but can be 1 if one of the Prolog 
flags on_error or on_warning 
is set to
[ISO]haltTerminate Prolog execution with default exit code using halt/1. 
The default exit code is normally 0, but can be 1 if one of the Prolog 
flags on_error or on_warning 
is set to
status and there have been errors or warnings.