[INFO] cloning repository https://github.com/link-a/learning-rust
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[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flink-a%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5cfe739935d47058eacef6536a5a34cefc528368
[INFO] checking link-a/learning-rust/5cfe739935d47058eacef6536a5a34cefc528368 against 1ed2df61a19042f231709eb05d032ae9e2cb2084 for pr-160235
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flink-a%2Flearning-rust" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/link-a/learning-rust
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[INFO] validating manifest of git repo https://github.com/link-a/learning-rust on toolchain 1ed2df61a19042f231709eb05d032ae9e2cb2084
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1ed2df61a19042f231709eb05d032ae9e2cb2084" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/link-a/learning-rust 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" "+1ed2df61a19042f231709eb05d032ae9e2cb2084" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bloom v0.3.2
[INFO] [stderr]   Downloaded hermit-abi v0.1.6
[INFO] [stderr]   Downloaded bit-vec v0.4.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:00c5645b54fe3ce5dae1417175e3c7fb6a6646c021d554ecd63a097b8b9f3602" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08
[INFO] running `Command { std: "docker" "start" "5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08" "/opt/rustwide/cargo-home/bin/cargo" "+1ed2df61a19042f231709eb05d032ae9e2cb2084" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08" "/opt/rustwide/cargo-home/bin/cargo" "+1ed2df61a19042f231709eb05d032ae9e2cb2084" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking bit-vec v0.4.4
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking bloom v0.3.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking ctci v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/bin/ref_cells.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[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::cell::RefCell`
[INFO] [stdout]  --> src/bin/ref_cells.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cell::RefCell;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/bin/ref_cells.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/bin/ref_cells.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]    --> src/bin/ref_cells.rs:228:9
[INFO] [stdout]     |
[INFO] [stdout] 228 |     use std::mem;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `val` and `next` are never read
[INFO] [stdout]   --> src/bin/ref_cells.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     struct Node {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 15 |         val: i32,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 16 |         next: Option<Rc<RefCell<Node>>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` 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: field `val` is never read
[INFO] [stdout]  --> src/bin/ownership.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Foo {
[INFO] [stdout]   |        --- field in this struct
[INFO] [stdout] 3 |     val: i32,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Foo` 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 `val`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/bin/ownership.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub struct Node {
[INFO] [stdout]    |                ---- fields in this struct
[INFO] [stdout] 17 |         val: u64,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 18 |         next: Option<Box<Node>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 19 |         prev: Option<Box<Node>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `val`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/bin/ownership.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub struct Node<'a> {
[INFO] [stdout]    |                ---- fields in this struct
[INFO] [stdout] 42 |         val: u64,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 43 |         next: Option<&'a Box<Node<'a>>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 44 |         prev: Option<&'a Box<Node<'a>>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/bin/unsafe.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cell_1`
[INFO] [stdout]  --> src/bin/unsafe.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let cell_1 = Cell {
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_cell_1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `val` and `next` are never read
[INFO] [stdout]  --> src/bin/unsafe.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Cell {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 2 |     val: i32,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 3 |     next: Option<Box<Cell>>,
[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 `val`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/bin/linked_list.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  8 | struct Node<T> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout]  9 |     val: T,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 10 |     next: NodePtr<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     prev: NodePtr<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` 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: field `tail` is never read
[INFO] [stdout]   --> src/bin/linked_list.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct DoublyLinkedList<T> where T: Default + Debug + Copy {
[INFO] [stdout]    |        ---------------- field in this struct
[INFO] [stdout] 37 |     head: NodePtr<T>,
[INFO] [stdout] 38 |     tail: NodePtr<T>
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DoublyLinkedList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NaiveSolution` is never constructed
[INFO] [stdout]  --> src/bin/max_distance_in_arrays.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct NaiveSolution {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `max_distance` is never used
[INFO] [stdout]  --> src/bin/max_distance_in_arrays.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl NaiveSolution {
[INFO] [stdout]   | ------------------ associated function in this implementation
[INFO] [stdout] 4 |
[INFO] [stdout] 5 |     pub fn max_distance(arrays: Vec<Vec<i32>>) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FastestSolution` is never constructed
[INFO] [stdout]   --> src/bin/max_distance_in_arrays.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct FastestSolution {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `max_distance` is never used
[INFO] [stdout]   --> src/bin/max_distance_in_arrays.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl FastestSolution {
[INFO] [stdout]    | -------------------- associated function in this implementation
[INFO] [stdout] 25 |
[INFO] [stdout] 26 |     pub fn max_distance(arrays: Vec<Vec<i32>>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]   --> src/bin/ref_playground.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let l = &(r.left);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `val` is never read
[INFO] [stdout]  --> src/bin/ownership.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Foo {
[INFO] [stdout]   |        --- field in this struct
[INFO] [stdout] 3 |     val: i32,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Foo` 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 `val`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/bin/ownership.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub struct Node {
[INFO] [stdout]    |                ---- fields in this struct
[INFO] [stdout] 17 |         val: u64,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 18 |         next: Option<Box<Node>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 19 |         prev: Option<Box<Node>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `val`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/bin/ownership.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub struct Node<'a> {
[INFO] [stdout]    |                ---- fields in this struct
[INFO] [stdout] 42 |         val: u64,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 43 |         next: Option<&'a Box<Node<'a>>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 44 |         prev: Option<&'a Box<Node<'a>>>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/bin/ref_playground.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::VecDeque;
[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 `min_height` and `min_width_pad` are never read
[INFO] [stdout]  --> src/bin/comment_block.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct CommentBlock {
[INFO] [stdout]   |        ------------ fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     min_height: i16,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 8 |     min_width_pad: i16,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CommentBlock` has a derived impl for the trait `Clone`, 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: struct `Solution` is never constructed
[INFO] [stdout]   --> src/bin/min_depth_binary_tree.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct Solution {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `min_depth` is never used
[INFO] [stdout]   --> src/bin/min_depth_binary_tree.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 27 |     pub fn min_depth(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `min_height` and `min_width_pad` are never read
[INFO] [stdout]  --> src/bin/comment_block.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct CommentBlock {
[INFO] [stdout]   |        ------------ fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     min_height: i16,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 8 |     min_width_pad: i16,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CommentBlock` has a derived impl for the trait `Clone`, 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 `val`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/bin/linked_list.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  8 | struct Node<T> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout]  9 |     val: T,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 10 |     next: NodePtr<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     prev: NodePtr<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` 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: field `tail` is never read
[INFO] [stdout]   --> src/bin/linked_list.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct DoublyLinkedList<T> where T: Default + Debug + Copy {
[INFO] [stdout]    |        ---------------- field in this struct
[INFO] [stdout] 37 |     head: NodePtr<T>,
[INFO] [stdout] 38 |     tail: NodePtr<T>
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DoublyLinkedList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/bin/unsafe.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cell_1`
[INFO] [stdout]  --> src/bin/unsafe.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let cell_1 = Cell {
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_cell_1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `val` and `next` are never read
[INFO] [stdout]  --> src/bin/unsafe.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Cell {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 2 |     val: i32,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 3 |     next: Option<Box<Cell>>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DPSolution` is never constructed
[INFO] [stdout]  --> src/bin/house_robber_ii.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct DPSolution {}
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `rob_simple` and `rob` are never used
[INFO] [stdout]   --> src/bin/house_robber_ii.rs:5:8
[INFO] [stdout]    |
[INFO] [stdout]  4 | impl DPSolution {
[INFO] [stdout]    | --------------- associated functions in this implementation
[INFO] [stdout]  5 |     fn rob_simple(nums: &[i32]) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn rob(nums: Vec<i32>) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/bin/ref_cells.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[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::cell::RefCell`
[INFO] [stdout]  --> src/bin/ref_cells.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cell::RefCell;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/bin/ref_cells.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/bin/ref_cells.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]    --> src/bin/ref_cells.rs:228:9
[INFO] [stdout]     |
[INFO] [stdout] 228 |     use std::mem;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `val` is never read
[INFO] [stdout]   --> src/bin/ref_cells.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     struct Node {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 15 |         val: i32,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.04s
[INFO] running `Command { std: "docker" "inspect" "5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08", kill_on_drop: false }`
[INFO] [stdout] 5732d785a97c16d58ea77465a603b40fd7cfd8e3f8f936b661210feadd5cca08
