6 use hashbrown::{HashMap, HashSet};
315     static ref SET_EMPTY: HashSet<char> = HashSet::new();
316     static ref SET: HashSet<char> = {
317         let mut s = HashSet::new();
386     let set_seq = SET_VEC_EMPTY.clone().into_iter().collect::<HashSet<_>>();  in set_seq_par_equivalence_collect_empty()
390         .collect::<HashSet<_>>();  in set_seq_par_equivalence_collect_empty()
400     let set_seq = SET_VEC.clone().into_iter().collect::<HashSet<_>>();  in set_seq_par_equivalence_collect()
401     let set_par = SET_VEC.clone().into_par_iter().collect::<HashSet<_>>();  in set_seq_par_equivalence_collect()
409     static ref SET_EXISTING_EMPTY: HashSet<char> = HashSet::new();
410     static ref SET_EXISTING: HashSet<char> = {
411         let mut s = HashSet::new();
422     let expected = HashSet::new();  in set_seq_par_equivalence_existing_empty_extend_empty()
434     let expected = SET_EXTENSION.iter().cloned().collect::<HashSet<_>>();  in set_seq_par_equivalence_existing_empty_extend()
469     static ref SET_A: HashSet<char> = ['a', 'b', 'c', 'd'].iter().cloned().collect();
470     static ref SET_B: HashSet<char> = ['a', 'b', 'e', 'f'].iter().cloned().collect();
471     static ref SET_DIFF_AB: HashSet<char> = ['c', 'd'].iter().cloned().collect();
472     static ref SET_DIFF_BA: HashSet<char> = ['e', 'f'].iter().cloned().collect();
473     static ref SET_SYMM_DIFF_AB: HashSet<char> = ['c', 'd', 'e', 'f'].iter().cloned().collect();
474     static ref SET_INTERSECTION_AB: HashSet<char> = ['a', 'b'].iter().cloned().collect();
475     static ref SET_UNION_AB: HashSet<char> =
481     let diff_ab_seq = SET_A.difference(&*SET_B).cloned().collect::<HashSet<_>>();  in set_seq_par_equivalence_difference()
485         .collect::<HashSet<_>>();  in set_seq_par_equivalence_difference()
489     let diff_ba_seq = SET_B.difference(&*SET_A).cloned().collect::<HashSet<_>>();  in set_seq_par_equivalence_difference()
493         .collect::<HashSet<_>>();  in set_seq_par_equivalence_difference()
503         .collect::<HashSet<_>>();  in set_seq_par_equivalence_symmetric_difference()
507         .collect::<HashSet<_>>();  in set_seq_par_equivalence_symmetric_difference()
514     let intersection_ab_seq = SET_A.intersection(&*SET_B).cloned().collect::<HashSet<_>>();  in set_seq_par_equivalence_intersection()
518         .collect::<HashSet<_>>();  in set_seq_par_equivalence_intersection()
529     let union_ab_seq = SET_A.union(&*SET_B).cloned().collect::<HashSet<_>>();  in set_seq_par_equivalence_union()
530     let union_ab_par = SET_A.par_union(&*SET_B).cloned().collect::<HashSet<_>>();  in set_seq_par_equivalence_union()