Restarts are named jumping points established by
rst_list() returns the names of all restarts currently
rst_exists() checks if a given restart is
rst_jump() stops execution of the current function
and jumps to a restart point. If the restart does not exist, an
error is thrown.
rst_maybe_jump() first checks that a restart
exists before jumping.
The name of a restart.
Arguments passed on to the restart function. These dots support tidy dots features.