[INFO] cloning repository https://github.com/Bigxage/rust-ownership-lab
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Bigxage/rust-ownership-lab" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBigxage%2Frust-ownership-lab", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
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[INFO] checking Bigxage/rust-ownership-lab against try#54cf65b8d066c082e536455049b95943cf30378f for pr-151920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBigxage%2Frust-ownership-lab" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
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[INFO] started tweaking git repo https://github.com/Bigxage/rust-ownership-lab
[INFO] finished tweaking git repo https://github.com/Bigxage/rust-ownership-lab
[INFO] tweaked toml for git repo https://github.com/Bigxage/rust-ownership-lab written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Bigxage/rust-ownership-lab on toolchain 54cf65b8d066c082e536455049b95943cf30378f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Bigxage/rust-ownership-lab 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" "+54cf65b8d066c082e536455049b95943cf30378f" "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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b9a7b56f0d8ab0753f89f1e0538b57a7b9ab44012bf0704e76ace1076e4d725
[INFO] running `Command { std: "docker" "start" "-a" "5b9a7b56f0d8ab0753f89f1e0538b57a7b9ab44012bf0704e76ace1076e4d725", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b9a7b56f0d8ab0753f89f1e0538b57a7b9ab44012bf0704e76ace1076e4d725", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b9a7b56f0d8ab0753f89f1e0538b57a7b9ab44012bf0704e76ace1076e4d725", kill_on_drop: false }`
[INFO] [stdout] 5b9a7b56f0d8ab0753f89f1e0538b57a7b9ab44012bf0704e76ace1076e4d725
[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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 547313c07f61586c6d55629712506d0e45295d66cee48b128c84381058af5d01
[INFO] running `Command { std: "docker" "start" "-a" "547313c07f61586c6d55629712506d0e45295d66cee48b128c84381058af5d01", kill_on_drop: false }`
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.9
[INFO] [stderr]     Checking ownership_lab v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/bin/day36_channels.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `age` are never read
[INFO] [stdout]   --> src/bin/day24_generics.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  8 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout]  9 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 10 |     age: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Success` and `Failed` are never constructed
[INFO] [stdout]   --> src/bin/day10_enums.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum TransactonStatus {
[INFO] [stdout]    |      ---------------- variants in this enum
[INFO] [stdout] 11 |     Pending,
[INFO] [stdout] 12 |     Success,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 13 |     Failed,
[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 variable: `b`
[INFO] [stdout]   --> src/bin/day32_ref_counting.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/bin/day32_ref_counting.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/day32_ref_counting.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Cons(i32, Rc<List>), // changed box to Rc (Reference counted)
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 5 -     Cons(i32, Rc<List>), // changed box to Rc (Reference counted)
[INFO] [stdout] 5 +     Cons((), ()), // changed box to Rc (Reference counted)
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]  --> src/bin/day34_weak_refs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 6 |     parent: RefCell<Weak<Node>>, //weak reference to parent to avoid cycle
[INFO] [stdout] 7 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]  --> src/bin/day34_weak_refs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 6 |     parent: RefCell<Weak<Node>>, //weak reference to parent to avoid cycle
[INFO] [stdout] 7 |     children: RefCell<Vec<Rc<Node>>>,
[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 import: `std::rc::Rc`
[INFO] [stdout]  --> src/bin/day38_send_sync.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/bin/day36_channels.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `age` are never read
[INFO] [stdout]   --> src/bin/day24_generics.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  8 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout]  9 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 10 |     age: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/bin/day38_send_sync.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `South` and `West` are never constructed
[INFO] [stdout]  --> src/bin/day21_enums.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum Direction {
[INFO] [stdout]   |      --------- variants in this enum
[INFO] [stdout] 2 |     North,
[INFO] [stdout] 3 |     South,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 4 |     East,
[INFO] [stdout] 5 |     West,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Success` and `Failed` are never constructed
[INFO] [stdout]   --> src/bin/day10_enums.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum TransactonStatus {
[INFO] [stdout]    |      ---------------- variants in this enum
[INFO] [stdout] 11 |     Pending,
[INFO] [stdout] 12 |     Success,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 13 |     Failed,
[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 variable: `list`
[INFO] [stdout]   --> src/bin/day31_smart_pointers.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/day31_smart_pointers.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(i32, Box<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(i32, Box<List>),
[INFO] [stdout] 6 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_tax` is never used
[INFO] [stdout]  --> src/bin/day19_testing.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn calculate_tax(amount: u64) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_sol` is never used
[INFO] [stdout]  --> src/bin/day19_testing.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn send_sol(amount: u64) -> bool {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]  --> src/bin/day15_vectors.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct LandPlot {
[INFO] [stdout]   |        -------- field in this struct
[INFO] [stdout] 2 |     size: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]  --> src/bin/day25_generic_structs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Point<T> {
[INFO] [stdout]   |        ----- fields in this struct
[INFO] [stdout] 5 |     x: T,
[INFO] [stdout]   |     ^
[INFO] [stdout] 6 |     y: T,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/bin/day25_generic_structs.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct MixedPoint<T, U> {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 13 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 14 |     y: U,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MixedPoint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `holder` is never read
[INFO] [stdout]  --> src/bin/project_bank.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Account {
[INFO] [stdout]   |        ------- field in this struct
[INFO] [stdout] 7 |     holder: String,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Account` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]  --> src/bin/day25_generic_structs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Point<T> {
[INFO] [stdout]   |        ----- fields in this struct
[INFO] [stdout] 5 |     x: T,
[INFO] [stdout]   |     ^
[INFO] [stdout] 6 |     y: T,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/bin/day25_generic_structs.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct MixedPoint<T, U> {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 13 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 14 |     y: U,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MixedPoint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]  --> src/bin/day15_vectors.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct LandPlot {
[INFO] [stdout]   |        -------- field in this struct
[INFO] [stdout] 2 |     size: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_item` is never used
[INFO] [stdout]   --> src/bin/day28_capstone.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout]  7 | impl<T> Storage<T> {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn get_item(&self) -> &T {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `South` and `West` are never constructed
[INFO] [stdout]  --> src/bin/day21_enums.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum Direction {
[INFO] [stdout]   |      --------- variants in this enum
[INFO] [stdout] 2 |     North,
[INFO] [stdout] 3 |     South,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 4 |     East,
[INFO] [stdout] 5 |     West,
[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 variable: `list`
[INFO] [stdout]   --> src/bin/day31_smart_pointers.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/day31_smart_pointers.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(i32, Box<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(i32, Box<List>),
[INFO] [stdout] 6 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_item` is never used
[INFO] [stdout]   --> src/bin/day28_capstone.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout]  7 | impl<T> Storage<T> {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn get_item(&self) -> &T {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `ownership_lab`
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider adding a `main` function to `src/main.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ownership_lab` (bin "ownership_lab") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/bin/day32_ref_counting.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/bin/day32_ref_counting.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/day32_ref_counting.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Cons(i32, Rc<List>), // changed box to Rc (Reference counted)
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 5 -     Cons(i32, Rc<List>), // changed box to Rc (Reference counted)
[INFO] [stdout] 5 +     Cons((), ()), // changed box to Rc (Reference counted)
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `holder` is never read
[INFO] [stdout]  --> src/bin/project_bank.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Account {
[INFO] [stdout]   |        ------- field in this struct
[INFO] [stdout] 7 |     holder: String,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Account` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "547313c07f61586c6d55629712506d0e45295d66cee48b128c84381058af5d01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "547313c07f61586c6d55629712506d0e45295d66cee48b128c84381058af5d01", kill_on_drop: false }`
[INFO] [stdout] 547313c07f61586c6d55629712506d0e45295d66cee48b128c84381058af5d01
