[INFO] cloning repository https://github.com/terakun/syntactic_monoid
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/terakun/syntactic_monoid" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakun%2Fsyntactic_monoid"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakun%2Fsyntactic_monoid'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 74a94df4aa27f5aa2492693dbd167f596e147fe0
[INFO] testing terakun/syntactic_monoid against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakun%2Fsyntactic_monoid" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/terakun/syntactic_monoid on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/terakun/syntactic_monoid
[INFO] finished tweaking git repo https://github.com/terakun/syntactic_monoid
[INFO] tweaked toml for git repo https://github.com/terakun/syntactic_monoid written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/terakun/syntactic_monoid already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d759d13bf4d5bd03278afe80acdbc203963876181a63d7a0eb673c6e63c95bdf
[INFO] running `"docker" "start" "-a" "d759d13bf4d5bd03278afe80acdbc203963876181a63d7a0eb673c6e63c95bdf"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling bit-set v0.4.0
[INFO] [stderr]    Compiling syntactic_monoid v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `regex::RegularExpression`
[INFO] [stderr]  --> src/syntactic_monoid.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use regex::RegularExpression;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:125:21
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 let mut s_f = State::new(1, true);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:146:21
[INFO] [stderr]     |
[INFO] [stderr] 146 |                 let mut nfa1 = NFA::construct(e1);
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:148:21
[INFO] [stderr]     |
[INFO] [stderr] 148 |                 let mut nfa2 = NFA::construct(e2);
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:151:21
[INFO] [stderr]     |
[INFO] [stderr] 151 |                 let mut s_i2 = nfa2.start.clone();
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:221:21
[INFO] [stderr]     |
[INFO] [stderr] 221 |                 let mut nfa = NFA::construct(e);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:226:21
[INFO] [stderr]     |
[INFO] [stderr] 226 |                 let mut s_f = State::new(snum + 1, true);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/dfa.rs:161:25
[INFO] [stderr]     |
[INFO] [stderr] 161 |             if let Some(mut v) = transition_map.get_mut(&(s.t.clone(), s.accept)) {
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/regex.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     Empty,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Epsilon`
[INFO] [stderr]  --> src/regex.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     Epsilon,
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/nfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_graphviz`
[INFO] [stderr]    --> src/nfa.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     pub fn to_graphviz(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_trans`
[INFO] [stderr]   --> src/dfa.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_trans`
[INFO] [stderr]   --> src/dfa.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn add_trans(&mut self, id: i32, ch: usize) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/dfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_subset`
[INFO] [stderr]   --> src/dfa.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn print_subset(subset: &SubSet) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `accept`
[INFO] [stderr]    --> src/dfa.rs:227:5
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `alphabets`
[INFO] [stderr]   --> src/syntactic_monoid.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     alphabets: BitSet,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.57s
[INFO] running `"docker" "inspect" "d759d13bf4d5bd03278afe80acdbc203963876181a63d7a0eb673c6e63c95bdf"`
[INFO] running `"docker" "rm" "-f" "d759d13bf4d5bd03278afe80acdbc203963876181a63d7a0eb673c6e63c95bdf"`
[INFO] [stdout] d759d13bf4d5bd03278afe80acdbc203963876181a63d7a0eb673c6e63c95bdf
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1c2ab55c735eaa05ce99c7393006a4961823c48e2d7524f4d76086f882fa9cf6
[INFO] running `"docker" "start" "-a" "1c2ab55c735eaa05ce99c7393006a4961823c48e2d7524f4d76086f882fa9cf6"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syntactic_monoid v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `regex::RegularExpression`
[INFO] [stderr]  --> src/syntactic_monoid.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use regex::RegularExpression;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:125:21
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 let mut s_f = State::new(1, true);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:146:21
[INFO] [stderr]     |
[INFO] [stderr] 146 |                 let mut nfa1 = NFA::construct(e1);
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:148:21
[INFO] [stderr]     |
[INFO] [stderr] 148 |                 let mut nfa2 = NFA::construct(e2);
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:151:21
[INFO] [stderr]     |
[INFO] [stderr] 151 |                 let mut s_i2 = nfa2.start.clone();
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:221:21
[INFO] [stderr]     |
[INFO] [stderr] 221 |                 let mut nfa = NFA::construct(e);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:226:21
[INFO] [stderr]     |
[INFO] [stderr] 226 |                 let mut s_f = State::new(snum + 1, true);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/dfa.rs:161:25
[INFO] [stderr]     |
[INFO] [stderr] 161 |             if let Some(mut v) = transition_map.get_mut(&(s.t.clone(), s.accept)) {
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/regex.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     Empty,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Epsilon`
[INFO] [stderr]  --> src/regex.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     Epsilon,
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/nfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_graphviz`
[INFO] [stderr]    --> src/nfa.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     pub fn to_graphviz(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_trans`
[INFO] [stderr]   --> src/dfa.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_trans`
[INFO] [stderr]   --> src/dfa.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn add_trans(&mut self, id: i32, ch: usize) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/dfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_subset`
[INFO] [stderr]   --> src/dfa.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn print_subset(subset: &SubSet) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `accept`
[INFO] [stderr]    --> src/dfa.rs:227:5
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `alphabets`
[INFO] [stderr]   --> src/syntactic_monoid.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     alphabets: BitSet,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `"docker" "inspect" "1c2ab55c735eaa05ce99c7393006a4961823c48e2d7524f4d76086f882fa9cf6"`
[INFO] running `"docker" "rm" "-f" "1c2ab55c735eaa05ce99c7393006a4961823c48e2d7524f4d76086f882fa9cf6"`
[INFO] [stdout] 1c2ab55c735eaa05ce99c7393006a4961823c48e2d7524f4d76086f882fa9cf6
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stdout] e0a13d222707734695a40df6b87d1a5bcab7a723eb2ec3015afddca9a212e951
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "e0a13d222707734695a40df6b87d1a5bcab7a723eb2ec3015afddca9a212e951"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused import: `regex::RegularExpression`
[INFO] [stderr]  --> src/syntactic_monoid.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use regex::RegularExpression;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:125:21
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 let mut s_f = State::new(1, true);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:146:21
[INFO] [stderr]     |
[INFO] [stderr] 146 |                 let mut nfa1 = NFA::construct(e1);
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:148:21
[INFO] [stderr]     |
[INFO] [stderr] 148 |                 let mut nfa2 = NFA::construct(e2);
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:151:21
[INFO] [stderr]     |
[INFO] [stderr] 151 |                 let mut s_i2 = nfa2.start.clone();
[INFO] [stderr]     |                     ----^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:221:21
[INFO] [stderr]     |
[INFO] [stderr] 221 |                 let mut nfa = NFA::construct(e);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/nfa.rs:226:21
[INFO] [stderr]     |
[INFO] [stderr] 226 |                 let mut s_f = State::new(snum + 1, true);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/dfa.rs:161:25
[INFO] [stderr]     |
[INFO] [stderr] 161 |             if let Some(mut v) = transition_map.get_mut(&(s.t.clone(), s.accept)) {
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/regex.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     Empty,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Epsilon`
[INFO] [stderr]  --> src/regex.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     Epsilon,
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/nfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_graphviz`
[INFO] [stderr]    --> src/nfa.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     pub fn to_graphviz(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_trans`
[INFO] [stderr]   --> src/dfa.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_trans`
[INFO] [stderr]   --> src/dfa.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn add_trans(&mut self, id: i32, ch: usize) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_trans`
[INFO] [stderr]   --> src/dfa.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn print_trans(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `print_subset`
[INFO] [stderr]   --> src/dfa.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn print_subset(subset: &SubSet) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `accept`
[INFO] [stderr]    --> src/dfa.rs:227:5
[INFO] [stderr]     |
[INFO] [stderr] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `alphabets`
[INFO] [stderr]   --> src/syntactic_monoid.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     alphabets: BitSet,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 18 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/syntactic_monoid-93562b183c1b8d42
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "e0a13d222707734695a40df6b87d1a5bcab7a723eb2ec3015afddca9a212e951"`
[INFO] running `"docker" "rm" "-f" "e0a13d222707734695a40df6b87d1a5bcab7a723eb2ec3015afddca9a212e951"`
[INFO] [stdout] e0a13d222707734695a40df6b87d1a5bcab7a723eb2ec3015afddca9a212e951