[INFO] cloning repository https://github.com/kazukiyoshida/data-structures-and-algorithms
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kazukiyoshida/data-structures-and-algorithms" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazukiyoshida%2Fdata-structures-and-algorithms", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazukiyoshida%2Fdata-structures-and-algorithms'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7a413b29d5c5a08ac8a1781f77128e9e42afc8d7
[INFO] testing kazukiyoshida/data-structures-and-algorithms against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazukiyoshida%2Fdata-structures-and-algorithms" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kazukiyoshida/data-structures-and-algorithms on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kazukiyoshida/data-structures-and-algorithms
[INFO] finished tweaking git repo https://github.com/kazukiyoshida/data-structures-and-algorithms
[INFO] tweaked toml for git repo https://github.com/kazukiyoshida/data-structures-and-algorithms written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/kazukiyoshida/data-structures-and-algorithms already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] accb2f16d8b2b78c6c93605f028746b203f059ab58dd008157a652f47050279b
[INFO] running `Command { std: "docker" "start" "-a" "accb2f16d8b2b78c6c93605f028746b203f059ab58dd008157a652f47050279b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "accb2f16d8b2b78c6c93605f028746b203f059ab58dd008157a652f47050279b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "accb2f16d8b2b78c6c93605f028746b203f059ab58dd008157a652f47050279b", kill_on_drop: false }`
[INFO] [stdout] accb2f16d8b2b78c6c93605f028746b203f059ab58dd008157a652f47050279b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c46bcb47eac5b1bc280d05e5b7de065ec2646d68f3875cbe6d09853697b39f20
[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" "c46bcb47eac5b1bc280d05e5b7de065ec2646d68f3875cbe6d09853697b39f20", kill_on_drop: false }`
[INFO] [stderr]    Compiling data-structures-and-algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `offset`
[INFO] [stdout]   --> src/skip_list.rs:40:30
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/skip_list.rs:40:43
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |                                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn new(v: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/linked_list.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn new_empty() -> TransactionLog {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/linked_list.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub fn append(&mut self, v: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/linked_list.rs:66:12
[INFO] [stdout]    |
[INFO] [stdout] 66 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/doubly_linked_list.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn new(v: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/doubly_linked_list.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn new_empty() -> BetterTransactionLog {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/doubly_linked_list.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn append(&mut self, v: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/doubly_linked_list.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/doubly_linked_list.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 |     pub fn iter(&self) -> ListIterator {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back_iter`
[INFO] [stdout]   --> src/doubly_linked_list.rs:86:12
[INFO] [stdout]    |
[INFO] [stdout] 86 |     pub fn back_iter(self) -> ListIterator {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/skip_list.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn new(offset: u64, command: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SkipList`
[INFO] [stdout]   --> src/skip_list.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct SkipList {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/skip_list.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn new_empty() -> SkipList {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/skip_list.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
[INFO] running `Command { std: "docker" "inspect" "c46bcb47eac5b1bc280d05e5b7de065ec2646d68f3875cbe6d09853697b39f20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c46bcb47eac5b1bc280d05e5b7de065ec2646d68f3875cbe6d09853697b39f20", kill_on_drop: false }`
[INFO] [stdout] c46bcb47eac5b1bc280d05e5b7de065ec2646d68f3875cbe6d09853697b39f20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] baf8d816ce75700eb57d200652635931dcb8629a207a54840de1f7082d28672b
[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" "baf8d816ce75700eb57d200652635931dcb8629a207a54840de1f7082d28672b", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `offset`
[INFO] [stdout]   --> src/skip_list.rs:40:30
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling data-structures-and-algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/skip_list.rs:40:43
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |                                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn new(v: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/linked_list.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn new_empty() -> TransactionLog {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/linked_list.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub fn append(&mut self, v: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/linked_list.rs:66:12
[INFO] [stdout]    |
[INFO] [stdout] 66 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/doubly_linked_list.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn new(v: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/doubly_linked_list.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn new_empty() -> BetterTransactionLog {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/doubly_linked_list.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn append(&mut self, v: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/doubly_linked_list.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/doubly_linked_list.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 |     pub fn iter(&self) -> ListIterator {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back_iter`
[INFO] [stdout]   --> src/doubly_linked_list.rs:86:12
[INFO] [stdout]    |
[INFO] [stdout] 86 |     pub fn back_iter(self) -> ListIterator {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/skip_list.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn new(offset: u64, command: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SkipList`
[INFO] [stdout]   --> src/skip_list.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct SkipList {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/skip_list.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn new_empty() -> SkipList {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/skip_list.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `offset`
[INFO] [stdout]   --> src/skip_list.rs:40:30
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/skip_list.rs:40:43
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |                                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/doubly_linked_list.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/doubly_linked_list.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 |     pub fn iter(&self) -> ListIterator {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back_iter`
[INFO] [stdout]   --> src/doubly_linked_list.rs:86:12
[INFO] [stdout]    |
[INFO] [stdout] 86 |     pub fn back_iter(self) -> ListIterator {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/skip_list.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn new(offset: u64, command: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SkipList`
[INFO] [stdout]   --> src/skip_list.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct SkipList {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/skip_list.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn new_empty() -> SkipList {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/skip_list.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.09s
[INFO] running `Command { std: "docker" "inspect" "baf8d816ce75700eb57d200652635931dcb8629a207a54840de1f7082d28672b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "baf8d816ce75700eb57d200652635931dcb8629a207a54840de1f7082d28672b", kill_on_drop: false }`
[INFO] [stdout] baf8d816ce75700eb57d200652635931dcb8629a207a54840de1f7082d28672b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0c32cb18dc0c62fdb2360e96eba279a1dc3e15b10ed95ed9379ec69abe8817ef
[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" "0c32cb18dc0c62fdb2360e96eba279a1dc3e15b10ed95ed9379ec69abe8817ef", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `offset`
[INFO] [stderr]   --> src/skip_list.rs:40:30
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stderr]    |                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]   --> src/skip_list.rs:40:43
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stderr]    |                                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list.rs:30:8
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn new(v: String) -> Rc<RefCell<Node>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new_empty`
[INFO] [stderr]   --> src/linked_list.rs:48:12
[INFO] [stderr]    |
[INFO] [stderr] 48 |     pub fn new_empty() -> TransactionLog {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `append`
[INFO] [stderr]   --> src/linked_list.rs:56:12
[INFO] [stderr]    |
[INFO] [stderr] 56 |     pub fn append(&mut self, v: String) {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `pop`
[INFO] [stderr]   --> src/linked_list.rs:66:12
[INFO] [stderr]    |
[INFO] [stderr] 66 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/doubly_linked_list.rs:22:8
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn new(v: String) -> Rc<RefCell<Node>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new_empty`
[INFO] [stderr]   --> src/doubly_linked_list.rs:41:12
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn new_empty() -> BetterTransactionLog {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `append`
[INFO] [stderr]   --> src/doubly_linked_list.rs:49:12
[INFO] [stderr]    |
[INFO] [stderr] 49 |     pub fn append(&mut self, v: String) {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `pop`
[INFO] [stderr]   --> src/doubly_linked_list.rs:63:12
[INFO] [stderr]    |
[INFO] [stderr] 63 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter`
[INFO] [stderr]   --> src/doubly_linked_list.rs:82:12
[INFO] [stderr]    |
[INFO] [stderr] 82 |     pub fn iter(&self) -> ListIterator {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `back_iter`
[INFO] [stderr]   --> src/doubly_linked_list.rs:86:12
[INFO] [stderr]    |
[INFO] [stderr] 86 |     pub fn back_iter(self) -> ListIterator {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/skip_list.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 |     fn new(offset: u64, command: String) -> Rc<RefCell<Node>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SkipList`
[INFO] [stderr]   --> src/skip_list.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct SkipList {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new_empty`
[INFO] [stderr]   --> src/skip_list.rs:31:12
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn new_empty() -> SkipList {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `append`
[INFO] [stderr]   --> src/skip_list.rs:40:12
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn append(&mut self, offset: u64, value: String) {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `data-structures-and-algorithms` (lib) generated 16 warnings
[INFO] [stderr] warning: associated function is never used: `pop`
[INFO] [stderr]   --> src/doubly_linked_list.rs:63:12
[INFO] [stderr]    |
[INFO] [stderr] 63 |     pub fn pop(&mut self) -> Option<String> {
[INFO] [stderr]    |            ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `data-structures-and-algorithms` (lib test) generated 9 warnings (8 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/data_structures_and_algorithms-12859532bdb3ca29)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test doubly_linked_list::test_doubly_linked_list ... ok
[INFO] [stdout] test linked_list::test_linked_list ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests data-structures-and-algorithms
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0c32cb18dc0c62fdb2360e96eba279a1dc3e15b10ed95ed9379ec69abe8817ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c32cb18dc0c62fdb2360e96eba279a1dc3e15b10ed95ed9379ec69abe8817ef", kill_on_drop: false }`
[INFO] [stdout] 0c32cb18dc0c62fdb2360e96eba279a1dc3e15b10ed95ed9379ec69abe8817ef