[INFO] cloning repository https://github.com/terakun/syntactic_monoid
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakun%2Fsyntactic_monoid'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 74a94df4aa27f5aa2492693dbd167f596e147fe0
[INFO] checking terakun/syntactic_monoid against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakun%2Fsyntactic_monoid" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/terakun/syntactic_monoid on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-4/source/Cargo.toml
[INFO] crate git repo https://github.com/terakun/syntactic_monoid already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 77957786b9c9e86f087ec19553f5774bea3a0108267f392cb1b542cf2509e1b9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "77957786b9c9e86f087ec19553f5774bea3a0108267f392cb1b542cf2509e1b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77957786b9c9e86f087ec19553f5774bea3a0108267f392cb1b542cf2509e1b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77957786b9c9e86f087ec19553f5774bea3a0108267f392cb1b542cf2509e1b9", kill_on_drop: false }`
[INFO] [stdout] 77957786b9c9e86f087ec19553f5774bea3a0108267f392cb1b542cf2509e1b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52baed93199fa4dce6ce6aaf931b94945d7bf1939a894ef2793a18d098b3f9d9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "52baed93199fa4dce6ce6aaf931b94945d7bf1939a894ef2793a18d098b3f9d9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking bit-set v0.4.0
[INFO] [stderr]     Checking syntactic_monoid v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `regex::RegularExpression`
[INFO] [stdout]  --> src/syntactic_monoid.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use regex::RegularExpression;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `regex::RegularExpression`
[INFO] [stdout]  --> src/syntactic_monoid.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use regex::RegularExpression;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:125:21
[INFO] [stdout]     |
[INFO] [stdout] 125 |                 let mut s_f = State::new(1, true);
[INFO] [stdout]     |                     ----^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:146:21
[INFO] [stdout]     |
[INFO] [stdout] 146 |                 let mut nfa1 = NFA::construct(e1);
[INFO] [stdout]     |                     ----^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:148:21
[INFO] [stdout]     |
[INFO] [stdout] 148 |                 let mut nfa2 = NFA::construct(e2);
[INFO] [stdout]     |                     ----^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:151:21
[INFO] [stdout]     |
[INFO] [stdout] 151 |                 let mut s_i2 = nfa2.start.clone();
[INFO] [stdout]     |                     ----^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:221:21
[INFO] [stdout]     |
[INFO] [stdout] 221 |                 let mut nfa = NFA::construct(e);
[INFO] [stdout]     |                     ----^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:226:21
[INFO] [stdout]     |
[INFO] [stdout] 226 |                 let mut s_f = State::new(snum + 1, true);
[INFO] [stdout]     |                     ----^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/dfa.rs:161:25
[INFO] [stdout]     |
[INFO] [stdout] 161 |             if let Some(mut v) = transition_map.get_mut(&(s.t.clone(), s.accept)) {
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Empty`
[INFO] [stdout]  --> src/regex.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     Empty,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Epsilon`
[INFO] [stdout]  --> src/regex.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Epsilon,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_trans`
[INFO] [stdout]   --> src/nfa.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn print_trans(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_graphviz`
[INFO] [stdout]    --> src/nfa.rs:253:12
[INFO] [stdout]     |
[INFO] [stdout] 253 |     pub fn to_graphviz(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_trans`
[INFO] [stdout]   --> src/dfa.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_trans`
[INFO] [stdout]   --> src/dfa.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn add_trans(&mut self, id: i32, ch: usize) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_trans`
[INFO] [stdout]   --> src/dfa.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn print_trans(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_subset`
[INFO] [stdout]   --> src/dfa.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 71 |     pub fn print_subset(subset: &SubSet) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `accept`
[INFO] [stdout]    --> src/dfa.rs:227:12
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `alphabets`
[INFO] [stdout]   --> src/syntactic_monoid.rs:75:5
[INFO] [stdout]    |
[INFO] [stdout] 75 |     alphabets: BitSet,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `input`
[INFO] [stdout]   --> src/syntactic_monoid.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     input: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:125:21
[INFO] [stdout]     |
[INFO] [stdout] 125 |                 let mut s_f = State::new(1, true);
[INFO] [stdout]     |                     ----^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:146:21
[INFO] [stdout]     |
[INFO] [stdout] 146 |                 let mut nfa1 = NFA::construct(e1);
[INFO] [stdout]     |                     ----^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:148:21
[INFO] [stdout]     |
[INFO] [stdout] 148 |                 let mut nfa2 = NFA::construct(e2);
[INFO] [stdout]     |                     ----^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:151:21
[INFO] [stdout]     |
[INFO] [stdout] 151 |                 let mut s_i2 = nfa2.start.clone();
[INFO] [stdout]     |                     ----^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:221:21
[INFO] [stdout]     |
[INFO] [stdout] 221 |                 let mut nfa = NFA::construct(e);
[INFO] [stdout]     |                     ----^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/nfa.rs:226:21
[INFO] [stdout]     |
[INFO] [stdout] 226 |                 let mut s_f = State::new(snum + 1, true);
[INFO] [stdout]     |                     ----^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/dfa.rs:161:25
[INFO] [stdout]     |
[INFO] [stdout] 161 |             if let Some(mut v) = transition_map.get_mut(&(s.t.clone(), s.accept)) {
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Empty`
[INFO] [stdout]  --> src/regex.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     Empty,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Epsilon`
[INFO] [stdout]  --> src/regex.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Epsilon,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_trans`
[INFO] [stdout]   --> src/nfa.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn print_trans(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_graphviz`
[INFO] [stdout]    --> src/nfa.rs:253:12
[INFO] [stdout]     |
[INFO] [stdout] 253 |     pub fn to_graphviz(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_trans`
[INFO] [stdout]   --> src/dfa.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn set_trans(&mut self, transition: &Vec<i32>) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_trans`
[INFO] [stdout]   --> src/dfa.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn add_trans(&mut self, id: i32, ch: usize) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_trans`
[INFO] [stdout]   --> src/dfa.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn print_trans(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print_subset`
[INFO] [stdout]   --> src/dfa.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 71 |     pub fn print_subset(subset: &SubSet) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `accept`
[INFO] [stdout]    --> src/dfa.rs:227:12
[INFO] [stdout]     |
[INFO] [stdout] 227 |     pub fn accept(&self, input: &Vec<u8>) -> bool {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `alphabets`
[INFO] [stdout]   --> src/syntactic_monoid.rs:75:5
[INFO] [stdout]    |
[INFO] [stdout] 75 |     alphabets: BitSet,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `input`
[INFO] [stdout]   --> src/syntactic_monoid.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     input: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.11s
[INFO] running `Command { std: "docker" "inspect" "52baed93199fa4dce6ce6aaf931b94945d7bf1939a894ef2793a18d098b3f9d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52baed93199fa4dce6ce6aaf931b94945d7bf1939a894ef2793a18d098b3f9d9", kill_on_drop: false }`
[INFO] [stdout] 52baed93199fa4dce6ce6aaf931b94945d7bf1939a894ef2793a18d098b3f9d9