[INFO] updating cached repository https://github.com/mustacean/algorithms_and_data_structures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 09428555313d6b8c53be8492adb5a8ca78e1cfbf
[INFO] checking mustacean/algorithms_and_data_structures against try#6024cfef3a82f9a7688f07054f1650081bad3af5 for pr-74130
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmustacean%2Falgorithms_and_data_structures" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mustacean/algorithms_and_data_structures on toolchain 6024cfef3a82f9a7688f07054f1650081bad3af5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mustacean/algorithms_and_data_structures
[INFO] finished tweaking git repo https://github.com/mustacean/algorithms_and_data_structures
[INFO] tweaked toml for git repo https://github.com/mustacean/algorithms_and_data_structures written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/mustacean/algorithms_and_data_structures already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 205834b745106dba541c3e652d3913942d7aa89dbe0a626b2af59a1dbb6ffcbc
[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" "205834b745106dba541c3e652d3913942d7aa89dbe0a626b2af59a1dbb6ffcbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "205834b745106dba541c3e652d3913942d7aa89dbe0a626b2af59a1dbb6ffcbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "205834b745106dba541c3e652d3913942d7aa89dbe0a626b2af59a1dbb6ffcbc", kill_on_drop: false }`
[INFO] [stdout] 205834b745106dba541c3e652d3913942d7aa89dbe0a626b2af59a1dbb6ffcbc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=forbid" "-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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ae19ff9e18827a9325674f3674982d48aea5ac8f206075c69dbac5bd0e238766
[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" "ae19ff9e18827a9325674f3674982d48aea5ac8f206075c69dbac5bd0e238766", kill_on_drop: false }`
[INFO] [stderr]     Checking data_structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `Trans_Log` should have an upper camel case name
[INFO] [stdout]   --> src/linked_list.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^ help: convert the identifier to upper camel case: `TransLog`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Trans_Log` should have an upper camel case name
[INFO] [stdout]   --> src/double_linked_list.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^ help: convert the identifier to upper camel case: `TransLog`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(value: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Trans_Log`
[INFO] [stdout]   --> src/linked_list.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/linked_list.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn new_empty() -> Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/linked_list.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn append(&mut self, value: String) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/linked_list.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     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/double_linked_list.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn new(value: String) -> Rc<RefCell<Node>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Trans_Log`
[INFO] [stdout]   --> src/double_linked_list.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_empty`
[INFO] [stdout]   --> src/double_linked_list.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn new_empty() -> Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Trans_Log` should have an upper camel case name
[INFO] [stdout]   --> src/linked_list.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^ help: convert the identifier to upper camel case: `TransLog`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Trans_Log` should have an upper camel case name
[INFO] [stdout]   --> src/double_linked_list.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct Trans_Log {
[INFO] [stdout]    |            ^^^^^^^^^ help: convert the identifier to upper camel case: `TransLog`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f_node`
[INFO] [stdout]   --> src/linked_list.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let f_node = Node::new("mustafa can".to_owned());
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_f_node`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_node`
[INFO] [stdout]   --> src/linked_list.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let s_node = Node::new("yeah, hommie.".to_owned());
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f_node`
[INFO] [stdout]   --> src/double_linked_list.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let f_node = Node::new("mustafa can".to_owned());
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_f_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_node`
[INFO] [stdout]   --> src/double_linked_list.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let s_node = Node::new("yeah, hommie.".to_owned());
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_trans`
[INFO] [stdout]   --> src/double_linked_list.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut new_trans = Trans_Log::new_empty();
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_trans`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/double_linked_list.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut new_trans = Trans_Log::new_empty();
[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: field is never read: `head`
[INFO] [stdout]   --> src/double_linked_list.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     head: Link,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `tail`
[INFO] [stdout]   --> src/double_linked_list.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     tail: Link,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.33s
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ae19ff9e18827a9325674f3674982d48aea5ac8f206075c69dbac5bd0e238766", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae19ff9e18827a9325674f3674982d48aea5ac8f206075c69dbac5bd0e238766", kill_on_drop: false }`
[INFO] [stdout] ae19ff9e18827a9325674f3674982d48aea5ac8f206075c69dbac5bd0e238766