#[test]
fn regression_validation_order() {
 let mut dfa = DFA::new("abc").unwrap();
 dfa.ms = MatchStates {
 slices: vec![],
 pattern_ids: vec![],
 pattern_len: 1,
 };
 let (buf, _) = dfa.to_bytes_native_endian();
 DFA::from_bytes(&buf).unwrap_err();
}

thread 'dfa::dense::tests::regression_validation_order' (365737) panicked at regex-automata/src/dfa/dense.rs:4644:9:
index out of bounds: the len is 0 but the index is 1
stack backtrace:
 [...]
 3: regex_automata::dfa::dense::MatchStates<T>::pattern_len
 at ./src/dfa/dense.rs:4644:9
 4: regex_automata::dfa::dense::DFA<T>::match_pattern_len
 at ./src/dfa/dense.rs:3006:17
 5: <regex_automata::dfa::dense::DFA<T> as regex_automata::dfa::automaton::Automaton>::match_len
 at ./src/dfa/dense.rs:3220:14
 6: regex_automata::dfa::dense::TransitionTable<T>::validate
 at ./src/dfa/dense.rs:3629:28
 7: regex_automata::dfa::dense::DFA<&[u32]>::from_bytes
 at ./src/dfa/dense.rs:2343:16
 8: regex_automata::dfa::dense::tests::regression_validation_order
 at ./src/dfa/dense.rs:5244:9