Checking es_vector:
1 1
1 3
2 0
es_vector_copy
1 1
1 3
2 0
es_copy
1 1
1 3
2 0
es_as_vector
2 3 4
es_vector with negative entry should fail.
Checking es_range:
1 1
1 3
2 0
Checking eit_as_vector using seq:
2 3 4
Checking ess_range using es_range parameters:
1 1
1 3
2 0
Checking whether ess_range accepts an empty range.
Checking es_path:
3 4
2 3
es_path with negative entry should fail.
Checking es_type.
Checking es_none.
es_pairs:
1 1
2 0
es_pairs for nonexistent pair should fail.
