[INFO] cloning repository https://github.com/wcr490/alg_with_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wcr490/alg_with_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwcr490%2Falg_with_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwcr490%2Falg_with_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0fa8d06ab234201f582e4a1442af854aeffb298f
[INFO] checking wcr490/alg_with_rust against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwcr490%2Falg_with_rust" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wcr490/alg_with_rust on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wcr490/alg_with_rust
[INFO] finished tweaking git repo https://github.com/wcr490/alg_with_rust
[INFO] tweaked toml for git repo https://github.com/wcr490/alg_with_rust written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/wcr490/alg_with_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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b38384dac96d4ae40da7e9136f7e17fe9674b02b8dd264d0d056d8b9cc662f6c
[INFO] running `Command { std: "docker" "start" "-a" "b38384dac96d4ae40da7e9136f7e17fe9674b02b8dd264d0d056d8b9cc662f6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b38384dac96d4ae40da7e9136f7e17fe9674b02b8dd264d0d056d8b9cc662f6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b38384dac96d4ae40da7e9136f7e17fe9674b02b8dd264d0d056d8b9cc662f6c", kill_on_drop: false }`
[INFO] [stdout] b38384dac96d4ae40da7e9136f7e17fe9674b02b8dd264d0d056d8b9cc662f6c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 439d91c45f8bf77b9e7f2ddf14841994ef183a0a214d6168428bf9d473da5458
[INFO] running `Command { std: "docker" "start" "-a" "439d91c45f8bf77b9e7f2ddf14841994ef183a0a214d6168428bf9d473da5458", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]     Checking either v1.10.0
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rayon v1.9.0
[INFO] [stderr]     Checking alg v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::bubble_sort`
[INFO] [stdout]   --> src/bubble_sort.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     use super::bubble_sort;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/merge_sort.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Weak`
[INFO] [stdout]  --> src/graph.rs:6:14
[INFO] [stdout]   |
[INFO] [stdout] 6 |     rc::{Rc, Weak},
[INFO] [stdout]   |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mem::swap`
[INFO] [stdout]   --> src/huffman_tree.rs:70:34
[INFO] [stdout]    |
[INFO] [stdout] 70 | use std::{collections::BTreeMap, mem::swap};
[INFO] [stdout]    |                                  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::b_rand::rand`
[INFO] [stdout]  --> src/skip_list.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::b_rand::rand;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::RandGen`
[INFO] [stdout]   --> src/b_rand.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     use super::RandGen;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::panic`
[INFO] [stdout]    --> src/binary_tree.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     use core::panic;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Weak`
[INFO] [stdout]  --> src/graph.rs:6:14
[INFO] [stdout]   |
[INFO] [stdout] 6 |     rc::{Rc, Weak},
[INFO] [stdout]   |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::panic`
[INFO] [stdout]   --> src/graph.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     use core::panic;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mem::swap`
[INFO] [stdout]   --> src/huffman_tree.rs:70:34
[INFO] [stdout]    |
[INFO] [stdout] 70 | use std::{collections::BTreeMap, mem::swap};
[INFO] [stdout]    |                                  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::panic`
[INFO] [stdout]    --> src/huffman_tree.rs:178:9
[INFO] [stdout]     |
[INFO] [stdout] 178 |     use core::panic;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::b_rand::rand`
[INFO] [stdout]  --> src/skip_list.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::b_rand::rand;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bubble_sort` is never used
[INFO] [stdout]  --> src/bubble_sort.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn bubble_sort<T: PartialOrd>(v: &mut [T]) {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BinTree` is never constructed
[INFO] [stdout]  --> src/binary_tree.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct BinTree<T>(Option<Box<BinData<T>>>);
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BinData` is never constructed
[INFO] [stdout]  --> src/binary_tree.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct BinData<T> {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `height`, `set_height`, `rot_left`, and `rot_right` are never used
[INFO] [stdout]   --> src/binary_tree.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl<T> BinTree<T> {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 13 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn height(&self) -> i8 {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn set_height(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn rot_left(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn rot_right(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `add_sorted` is never used
[INFO] [stdout]   --> src/binary_tree.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl<T: PartialOrd> BinTree<T> {
[INFO] [stdout]    | ------------------------------ method in this implementation
[INFO] [stdout] 36 |     pub fn add_sorted(&mut self, data: T) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_left_first` is never used
[INFO] [stdout]   --> src/binary_tree.rs:75:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | impl<T: Debug> BinTree<T> {
[INFO] [stdout]    | ------------------------- method in this implementation
[INFO] [stdout] 75 |     pub fn print_left_first(&self, dp: i32) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `rot_left` and `rot_right` are never used
[INFO] [stdout]    --> src/binary_tree.rs:89:12
[INFO] [stdout]     |
[INFO] [stdout] 88  | impl<T> BinData<T> {
[INFO] [stdout]     | ------------------ methods in this implementation
[INFO] [stdout] 89  |     pub fn rot_left(mut self) -> Box<Self> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 100 |     pub fn rot_right(mut self) -> Box<Self> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Rcc` is never used
[INFO] [stdout]  --> src/graph.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | type Rcc<T> = Rc<RefCell<T>>;
[INFO] [stdout]   |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rcc` is never used
[INFO] [stdout]   --> src/graph.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn rcc<T>(t: T) -> Rcc<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GraphErr` is never constructed
[INFO] [stdout]   --> src/graph.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct GraphErr {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GraphErr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/graph.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl GraphErr {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 20 |     pub fn new(s: &str) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `weight` is never used
[INFO] [stdout]   --> src/graph.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub trait Weight {
[INFO] [stdout]    |           ------ method in this trait
[INFO] [stdout] 26 |     fn weight(&self) -> i32;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Graph` is never constructed
[INFO] [stdout]   --> src/graph.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Graph<T, E, ID: Eq + Hash> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Graph` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_node`, and `add_edge` are never used
[INFO] [stdout]   --> src/graph.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl<T, E, ID: Eq + Clone + Hash> Graph<T, E, ID> {
[INFO] [stdout]    | ------------------------------------------------- associated items in this implementation
[INFO] [stdout] 36 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn add_node(&mut self, node: ID, data: T) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     pub fn add_edge(&mut self, edge: ID, from: ID, to: ID, edge_data: E) -> Result<(), GraphErr> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Tree` and `Leaf` are never constructed
[INFO] [stdout]   --> src/huffman_tree.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 73 | pub enum HuffNode {
[INFO] [stdout]    |          -------- variants in this enum
[INFO] [stdout] 74 |     Tree(Box<HuffNode>, Box<HuffNode>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 75 |     Leaf(char),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `HuffNode` 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 `HScore` is never constructed
[INFO] [stdout]   --> src/huffman_tree.rs:78:12
[INFO] [stdout]    |
[INFO] [stdout] 78 | pub struct HScore {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_tree` is never used
[INFO] [stdout]   --> src/huffman_tree.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 | pub fn build_tree(s: &str) -> HuffNode {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `print_lfirst`, `encode_char`, and `encode_str` are never used
[INFO] [stdout]    --> src/huffman_tree.rs:119:12
[INFO] [stdout]     |
[INFO] [stdout] 118 | impl HuffNode {
[INFO] [stdout]     | ------------- methods in this implementation
[INFO] [stdout] 119 |     pub fn print_lfirst(&self, depth: i32, dir: char) {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 140 |     pub fn encode_char(&self, c: char) -> Option<Vec<char>> {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 163 |     pub fn encode_str(&self, s: &str) -> Option<Vec<char>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `start_rc` and `contains` are never used
[INFO] [stdout]   --> src/route.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl<ID: Eq> Route<ID> {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 22 |     pub fn start_rc(pos: ID) -> Rc<Self> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn contains(&self, pos: ID) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `shortest_path` is never used
[INFO] [stdout]   --> src/route.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 50 | impl<T, E: Weight, ID: Clone + Hash + Eq> Graph<T, E, ID> {
[INFO] [stdout]    | --------------------------------------------------------- method in this implementation
[INFO] [stdout] 51 |     pub fn shortest_path(&self, from: ID, to: ID) -> Option<Rc<Route<ID>>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rcc` is never used
[INFO] [stdout]  --> src/skip_list.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn rcc<T>(t: T) -> Rcc<T> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `down` is never read
[INFO] [stdout]   --> src/skip_list.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct SkipNode<T: PartialOrd> {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 15 |     right: Option<Rcc<SkipNode<T>>>,
[INFO] [stdout] 16 |     down: Option<Rcc<SkipNode<T>>>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SkipNode` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `insert` are never used
[INFO] [stdout]   --> src/skip_list.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl<T: PartialOrd> SkipNode<T> {
[INFO] [stdout]    | ------------------------------- associated items in this implementation
[INFO] [stdout] 24 |     pub fn new(t: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn insert(&mut self, data: T) -> Option<Rcc<SkipNode<T>>> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `insert`, and `loop_up` are never used
[INFO] [stdout]   --> src/skip_list.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | impl<T: PartialOrd> SkipList<T> {
[INFO] [stdout]    | ------------------------------- associated items in this implementation
[INFO] [stdout] 66 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |     pub fn insert(&mut self, data: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |     pub fn loop_up(&mut self, ch: Rcc<SkipNode<T>>, n: usize) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/skip_list.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |         write!(w, "{:?}", self.data.borrow());
[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]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/skip_list.rs:114:13
[INFO] [stdout]     |
[INFO] [stdout] 114 |             r.borrow().print_row(w);
[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] 114 |             let _ = r.borrow().print_row(w);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Rcc` is never used
[INFO] [stdout]  --> src/graph.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | type Rcc<T> = Rc<RefCell<T>>;
[INFO] [stdout]   |      ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rcc` is never used
[INFO] [stdout]   --> src/graph.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn rcc<T>(t: T) -> Rcc<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `msg` is never read
[INFO] [stdout]   --> src/graph.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct GraphErr {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 16 |     msg: String,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GraphErr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `weight` is never used
[INFO] [stdout]   --> src/graph.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub trait Weight {
[INFO] [stdout]    |           ------ method in this trait
[INFO] [stdout] 26 |     fn weight(&self) -> i32;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `start_rc` and `contains` are never used
[INFO] [stdout]   --> src/route.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl<ID: Eq> Route<ID> {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 22 |     pub fn start_rc(pos: ID) -> Rc<Self> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn contains(&self, pos: ID) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `shortest_path` is never used
[INFO] [stdout]   --> src/route.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 50 | impl<T, E: Weight, ID: Clone + Hash + Eq> Graph<T, E, ID> {
[INFO] [stdout]    | --------------------------------------------------------- method in this implementation
[INFO] [stdout] 51 |     pub fn shortest_path(&self, from: ID, to: ID) -> Option<Rc<Route<ID>>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rcc` is never used
[INFO] [stdout]  --> src/skip_list.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn rcc<T>(t: T) -> Rcc<T> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `down` is never read
[INFO] [stdout]   --> src/skip_list.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct SkipNode<T: PartialOrd> {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 15 |     right: Option<Rcc<SkipNode<T>>>,
[INFO] [stdout] 16 |     down: Option<Rcc<SkipNode<T>>>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SkipNode` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `insert` are never used
[INFO] [stdout]   --> src/skip_list.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl<T: PartialOrd> SkipNode<T> {
[INFO] [stdout]    | ------------------------------- associated items in this implementation
[INFO] [stdout] 24 |     pub fn new(t: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn insert(&mut self, data: T) -> Option<Rcc<SkipNode<T>>> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `insert`, and `loop_up` are never used
[INFO] [stdout]   --> src/skip_list.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | impl<T: PartialOrd> SkipList<T> {
[INFO] [stdout]    | ------------------------------- associated items in this implementation
[INFO] [stdout] 66 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |     pub fn insert(&mut self, data: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |     pub fn loop_up(&mut self, ch: Rcc<SkipNode<T>>, n: usize) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/skip_list.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |         write!(w, "{:?}", self.data.borrow());
[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]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/skip_list.rs:114:13
[INFO] [stdout]     |
[INFO] [stdout] 114 |             r.borrow().print_row(w);
[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] 114 |             let _ = r.borrow().print_row(w);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.48s
[INFO] running `Command { std: "docker" "inspect" "439d91c45f8bf77b9e7f2ddf14841994ef183a0a214d6168428bf9d473da5458", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "439d91c45f8bf77b9e7f2ddf14841994ef183a0a214d6168428bf9d473da5458", kill_on_drop: false }`
[INFO] [stdout] 439d91c45f8bf77b9e7f2ddf14841994ef183a0a214d6168428bf9d473da5458