[INFO] cloning repository https://github.com/ArberSephirotheca/chord_rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ArberSephirotheca/chord_rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArberSephirotheca%2Fchord_rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArberSephirotheca%2Fchord_rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 593af5c09d0e1d716a4de53731df9e8532d3291b
[INFO] building ArberSephirotheca/chord_rs against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArberSephirotheca%2Fchord_rs" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ArberSephirotheca/chord_rs on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ArberSephirotheca/chord_rs
[INFO] finished tweaking git repo https://github.com/ArberSephirotheca/chord_rs
[INFO] tweaked toml for git repo https://github.com/ArberSephirotheca/chord_rs written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ArberSephirotheca/chord_rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bbb5871702665232d9a70597b1f7cdbd024337204fb908a6fc5676faa57c8bf4
[INFO] running `Command { std: "docker" "start" "-a" "bbb5871702665232d9a70597b1f7cdbd024337204fb908a6fc5676faa57c8bf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbb5871702665232d9a70597b1f7cdbd024337204fb908a6fc5676faa57c8bf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbb5871702665232d9a70597b1f7cdbd024337204fb908a6fc5676faa57c8bf4", kill_on_drop: false }`
[INFO] [stdout] bbb5871702665232d9a70597b1f7cdbd024337204fb908a6fc5676faa57c8bf4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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 -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f21fcfbac452e3067badef761ccc2f5b55718b5378b5a1072dd820d9c2409cd5
[INFO] running `Command { std: "docker" "start" "-a" "f21fcfbac452e3067badef761ccc2f5b55718b5378b5a1072dd820d9c2409cd5", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.75
[INFO] [stderr]    Compiling chord v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/node.rs:137:16
[INFO] [stdout]     |
[INFO] [stdout] 137 |             if let finger = item {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BITLENGTH` is never used
[INFO] [stdout]  --> src/node.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const BITLENGTH: u8 = 8;
[INFO] [stdout]   |       ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX` is never used
[INFO] [stdout]  --> src/node.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 | const MAX: u32 = 2u32.pow(BITLENGTH as u32) - 1;
[INFO] [stdout]   |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `node_inner` is never read
[INFO] [stdout]   --> src/node.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Node {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 12 |     pub node_inner: NodeRef,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `start` and `node` are never read
[INFO] [stdout]   --> src/node.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Finger {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 17 |     start: u8,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 18 |     node: Option<Node>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Finger` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `node_id`, `predecessor`, and `finger_table` are never read
[INFO] [stdout]   --> src/node.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct FingerTable {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 22 |     node_id: u8,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 23 |     predecessor: Option<Node>,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 24 |     finger_table: Vec<Option<Finger>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `FingerTable` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `finger_table`, `local_keys`, and `lookup_info` are never read
[INFO] [stdout]   --> src/node.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub struct NodeInner {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 29 |     id: u8,
[INFO] [stdout] 30 |     finger_table: FingerTable,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 31 |     //key = key identifier/ finger id, aslo the index for fingertable, value = node identifier
[INFO] [stdout] 32 |     local_keys: HashMap<u8, Option<u8>>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 33 |     lookup_info: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `NodeInner` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `set_node` are never used
[INFO] [stdout]   --> src/node.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Finger {
[INFO] [stdout]    | ----------- associated items in this implementation
[INFO] [stdout] 36 |     fn new(start: u8, node: Option<Node>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |     fn set_node(&mut self, node: Node) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/node.rs:45:8
[INFO] [stdout]     |
[INFO] [stdout] 44  | impl<'a> FingerTable {
[INFO] [stdout]     | -------------------- associated items in this implementation
[INFO] [stdout] 45  |     fn new(node_id: u8) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 60  |     fn set(&mut self, index: u8, successor: Node) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 68  |     fn get(&self, index: u8) -> &Finger {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 73  |     fn get_start(&self, index: u8) -> Result<u8> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 86  |     fn get_successor_id(&self) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 94  |     fn get_successor_node(&self) -> Option<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 100 |     fn set_successor(&mut self, node: Node) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 105 |     fn set_predecessor(&mut self, predecessor: Option<Node>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 109 |     fn get_predecessor_id(&self) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 116 |     pub fn finger_id(node_id: u8, index: u8) -> u8 {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 125 |     fn pretty_print(&self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/node.rs:170:12
[INFO] [stdout]     |
[INFO] [stdout] 169 | impl NodeInner {
[INFO] [stdout]     | -------------- associated function in this implementation
[INFO] [stdout] 170 |     pub fn new(node_id: u8) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/node.rs:181:12
[INFO] [stdout]     |
[INFO] [stdout] 180 | impl Node {
[INFO] [stdout]     | --------- associated items in this implementation
[INFO] [stdout] 181 |     pub fn new(node_id: u8) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     pub fn new_inner(node_inner: NodeRef) -> Self {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 190 |     pub fn join(&mut self, node: Option<Node>) -> Result<()> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 212 |     pub fn init_finger_table(&mut self, node: Node) -> Result<()> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 260 |     fn update_others(&mut self) -> Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 275 |     fn update_finger_table(&mut self, node: Node, index: u8) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 306 |     fn update_finger_table_leave(&mut self, node: Node, index: u8, leav_id: u8) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 336 |     pub fn leave(&mut self) -> Result<()> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 358 |     fn update_others_leave(&self) -> Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 369 |     pub fn pretty_print(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 373 |     pub fn print_keys(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 394 |     pub fn print_lookup_results(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 403 |     pub fn find(&self, key: u8) -> Option<u8> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 433 |     pub fn insert(&mut self, key: u8, value: Option<u8>) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 442 |     fn remove(&mut self, key: u8) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 447 |     fn transfer_keys(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 477 |     fn transfer_keys_leave(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 503 |     fn successor(&self) -> Result<Node> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 516 |     fn predecessor(&self) -> Option<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 520 |     fn find_successor(&self, id: u8) -> Result<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 525 |     fn decrease(value: u8, size: u8) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 532 |     fn find_predecessor(&self, id: u8) -> Result<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 544 |     fn is_between_ring_e(&self, id: u8, node1: u8, node2: u8) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 552 |     fn e_is_between_ring(&self, id: u8, node1: u8, node2: u8) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 560 |     fn between(&self, mut id: u8, mut node1: u8, mut node2: u8) -> bool {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 572 |     fn closest_preceding_node(&self, id: u8) -> Result<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.07s
[INFO] running `Command { std: "docker" "inspect" "f21fcfbac452e3067badef761ccc2f5b55718b5378b5a1072dd820d9c2409cd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f21fcfbac452e3067badef761ccc2f5b55718b5378b5a1072dd820d9c2409cd5", kill_on_drop: false }`
[INFO] [stdout] f21fcfbac452e3067badef761ccc2f5b55718b5378b5a1072dd820d9c2409cd5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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 -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ee35c63bfb5a01bd8b102d081723b9a1004b0af5fb7fae7ab60a2471cb07fc6
[INFO] running `Command { std: "docker" "start" "-a" "2ee35c63bfb5a01bd8b102d081723b9a1004b0af5fb7fae7ab60a2471cb07fc6", kill_on_drop: false }`
[INFO] [stderr]    Compiling chord v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/node.rs:137:16
[INFO] [stdout]     |
[INFO] [stdout] 137 |             if let finger = item {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `set_node` is never used
[INFO] [stdout]   --> src/node.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Finger {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 40 |     fn set_node(&mut self, node: Node) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         n0.join(None);
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let _ = n0.join(None);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         n1.join(Some(n0.clone()));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let _ = n1.join(Some(n0.clone()));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         n2.join(Some(n1.clone()));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 15 |         let _ = n2.join(Some(n1.clone()));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         n3.join(Some(n2.clone()));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let _ = n3.join(Some(n2.clone()));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         n4.join(Some(n3.clone()));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 17 |         let _ = n4.join(Some(n3.clone()));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         n5.join(Some(n4.clone()));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let _ = n5.join(Some(n4.clone()));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         n6.join(Some(n5.clone()));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let _ = n6.join(Some(n5.clone()));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/test.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |         n2.leave();
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 94 |         let _ = n2.leave();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.53s
[INFO] running `Command { std: "docker" "inspect" "2ee35c63bfb5a01bd8b102d081723b9a1004b0af5fb7fae7ab60a2471cb07fc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ee35c63bfb5a01bd8b102d081723b9a1004b0af5fb7fae7ab60a2471cb07fc6", kill_on_drop: false }`
[INFO] [stdout] 2ee35c63bfb5a01bd8b102d081723b9a1004b0af5fb7fae7ab60a2471cb07fc6