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error(Formal, Context) exceptions that unify. The
tracer is started when a matching exception is raised. This
predicate enables debug mode using debug/0 to get more context
about the exception. Even with debug mode disabled exceptions are
still trapped and thus one may call nodebug/0 to run in normal mode
after installing a trap. Exceptions are trapped in any thread. Debug
mode is only enabled in the calling thread. To enable debug mode in
all threads use tdebug/0.
In many cases debugging an exception that is caught is as simple as below (assuming run/0 starts your program).
?- trap(_). ?- run.
The multifile hook trap_alias/2 allow for defining short hands for commonly used traps. Currently this defines