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initialization(Goal, main)is executed as main goal. If Goal fails or raises an exception, the process terminates with non-zero exit code. If not explicitly specified using the -t the toplevel goal is set to halt/0, causing the process to exit with status 0. An explicitly specified toplevel is executed normally. This implies that
-t prologcauses the application to start the normal interactive toplevel after completing Goal. See also the Prolog flag toplevel_goal and section 22.214.171.124.