[INFO] cloning repository https://github.com/sh0623k/coding_interview
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sh0623k/coding_interview" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsh0623k%2Fcoding_interview", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsh0623k%2Fcoding_interview'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ad2a675ba51f91fb104e2272a58badfd5bfa77bc
[INFO] checking sh0623k/coding_interview against try#63132bd615c9bf75e93af8405d00064212331708 for pr-153975
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsh0623k%2Fcoding_interview" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/sh0623k/coding_interview
[INFO] finished tweaking git repo https://github.com/sh0623k/coding_interview
[INFO] tweaked toml for git repo https://github.com/sh0623k/coding_interview written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sh0623k/coding_interview on toolchain 63132bd615c9bf75e93af8405d00064212331708
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/sh0623k/coding_interview 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" "+63132bd615c9bf75e93af8405d00064212331708" "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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1d18d512c98fbcc68ac1bbd67195fd5cd48e7240f78a6a89d8fcea6ae9443065
[INFO] running `Command { std: "docker" "start" "-a" "1d18d512c98fbcc68ac1bbd67195fd5cd48e7240f78a6a89d8fcea6ae9443065", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d18d512c98fbcc68ac1bbd67195fd5cd48e7240f78a6a89d8fcea6ae9443065", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d18d512c98fbcc68ac1bbd67195fd5cd48e7240f78a6a89d8fcea6ae9443065", kill_on_drop: false }`
[INFO] [stdout] 1d18d512c98fbcc68ac1bbd67195fd5cd48e7240f78a6a89d8fcea6ae9443065
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9b00e1fc8cd28fa333b1c15886e3f25c28fe1d3ceba427786fc0327ec0052db
[INFO] running `Command { std: "docker" "start" "-a" "f9b00e1fc8cd28fa333b1c15886e3f25c28fe1d3ceba427786fc0327ec0052db", kill_on_drop: false }`
[INFO] [stderr]     Checking coding_interview v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/linked_list.rs:147:17
[INFO] [stdout]     |
[INFO] [stdout] 147 |                 &node.borrow_mut().remove();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 147 |                 let _ = &node.borrow_mut().remove();
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/queue.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn iter(&self) -> QueueIter<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn iter(&self) -> QueueIter<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/linked_list.rs:147:17
[INFO] [stdout]     |
[INFO] [stdout] 147 |                 &node.borrow_mut().remove();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 147 |                 let _ = &node.borrow_mut().remove();
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/linked_list.rs:405:17
[INFO] [stdout]     |
[INFO] [stdout] 405 |                 &node.borrow_mut().remove();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 405 |                 let _ = &node.borrow_mut().remove();
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/queue.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn iter(&self) -> QueueIter<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn iter(&self) -> QueueIter<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/bin/ch02p03.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |             &node.borrow_mut().remove();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 19 |             let _ = &node.borrow_mut().remove();
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/ch04p02.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut mbst = MinimalBinarySearchTree::<i32>::new(&arr);
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/ch07p01.rs:91:13
[INFO] [stdout]    |
[INFO] [stdout] 91 |         let mut value = 0;
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/ch07p01.rs:108:13
[INFO] [stdout]     |
[INFO] [stdout] 108 |         let mut score = 0;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `card`
[INFO] [stdout]    --> src/bin/ch07p01.rs:112:28
[INFO] [stdout]     |
[INFO] [stdout] 112 |     fn add_card(&mut self, card: BlackJackCard) {
[INFO] [stdout]     |                            ^^^^ help: if this is intentional, prefix it with an underscore: `_card`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/ch07p01.rs:136:13
[INFO] [stdout]     |
[INFO] [stdout] 136 |         let mut hand: Vec<BlackJackCard> = vec![];
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Card` is never used
[INFO] [stdout]   --> src/bin/ch07p01.rs:50:7
[INFO] [stdout]    |
[INFO] [stdout] 50 | trait Card {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Deck` is never used
[INFO] [stdout]   --> src/bin/ch07p01.rs:55:7
[INFO] [stdout]    |
[INFO] [stdout] 55 | trait Deck<C: Card> {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Hand` is never used
[INFO] [stdout]   --> src/bin/ch07p01.rs:63:7
[INFO] [stdout]    |
[INFO] [stdout] 63 | trait Hand<C: Card> {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `suit`, `rank`, and `available` are never read
[INFO] [stdout]   --> src/bin/ch07p01.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct BlackJackCard {
[INFO] [stdout]    |        ------------- fields in this struct
[INFO] [stdout] 71 |     suit: Suit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 72 |     rank: Rank,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 73 |     available: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BlackJackCard` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BlackJackHand` is never constructed
[INFO] [stdout]   --> src/bin/ch07p01.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 97 | struct BlackJackHand {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BlackJackDeck` is never constructed
[INFO] [stdout]    --> src/bin/ch07p01.rs:117:8
[INFO] [stdout]     |
[INFO] [stdout] 117 | struct BlackJackDeck {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/ch07p01.rs:91:13
[INFO] [stdout]    |
[INFO] [stdout] 91 |         let mut value = 0;
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/ch07p01.rs:108:13
[INFO] [stdout]     |
[INFO] [stdout] 108 |         let mut score = 0;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `card`
[INFO] [stdout]    --> src/bin/ch07p01.rs:112:28
[INFO] [stdout]     |
[INFO] [stdout] 112 |     fn add_card(&mut self, card: BlackJackCard) {
[INFO] [stdout]     |                            ^^^^ help: if this is intentional, prefix it with an underscore: `_card`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/ch07p01.rs:136:13
[INFO] [stdout]     |
[INFO] [stdout] 136 |         let mut hand: Vec<BlackJackCard> = vec![];
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Card` is never used
[INFO] [stdout]   --> src/bin/ch07p01.rs:50:7
[INFO] [stdout]    |
[INFO] [stdout] 50 | trait Card {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/bin/ch02p03.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |             &node.borrow_mut().remove();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 19 |             let _ = &node.borrow_mut().remove();
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Deck` is never used
[INFO] [stdout]   --> src/bin/ch07p01.rs:55:7
[INFO] [stdout]    |
[INFO] [stdout] 55 | trait Deck<C: Card> {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Hand` is never used
[INFO] [stdout]   --> src/bin/ch07p01.rs:63:7
[INFO] [stdout]    |
[INFO] [stdout] 63 | trait Hand<C: Card> {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `suit`, `rank`, and `available` are never read
[INFO] [stdout]   --> src/bin/ch07p01.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct BlackJackCard {
[INFO] [stdout]    |        ------------- fields in this struct
[INFO] [stdout] 71 |     suit: Suit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 72 |     rank: Rank,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 73 |     available: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BlackJackCard` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BlackJackHand` is never constructed
[INFO] [stdout]   --> src/bin/ch07p01.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 97 | struct BlackJackHand {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BlackJackDeck` is never constructed
[INFO] [stdout]    --> src/bin/ch07p01.rs:117:8
[INFO] [stdout]     |
[INFO] [stdout] 117 | struct BlackJackDeck {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `complete_call` and `escalate` are never used
[INFO] [stdout]   --> src/bin/ch07p02.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | trait Employee {
[INFO] [stdout]    |       -------- methods in this trait
[INFO] [stdout] 28 |     fn receive_call(&mut self, call: &Call);
[INFO] [stdout] 29 |     fn complete_call(&mut self, call: &mut Call);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 30 |     fn escalate(&mut self, call: &mut Call);
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `completed` is never read
[INFO] [stdout]   --> src/bin/ch07p02.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Call {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 37 |     rank: Rank,
[INFO] [stdout] 38 |     completed: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Call` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `complete_call` and `escalate` are never used
[INFO] [stdout]   --> src/bin/ch07p02.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | trait Employee {
[INFO] [stdout]    |       -------- methods in this trait
[INFO] [stdout] 28 |     fn receive_call(&mut self, call: &Call);
[INFO] [stdout] 29 |     fn complete_call(&mut self, call: &mut Call);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 30 |     fn escalate(&mut self, call: &mut Call);
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `completed` is never read
[INFO] [stdout]   --> src/bin/ch07p02.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Call {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 37 |     rank: Rank,
[INFO] [stdout] 38 |     completed: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Call` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/ch04p02.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut mbst = MinimalBinarySearchTree::<i32>::new(&arr);
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `Command { std: "docker" "inspect" "f9b00e1fc8cd28fa333b1c15886e3f25c28fe1d3ceba427786fc0327ec0052db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9b00e1fc8cd28fa333b1c15886e3f25c28fe1d3ceba427786fc0327ec0052db", kill_on_drop: false }`
[INFO] [stdout] f9b00e1fc8cd28fa333b1c15886e3f25c28fe1d3ceba427786fc0327ec0052db
