[INFO] cloning repository https://github.com/simpletrontdip/learn-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/simpletrontdip/learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpletrontdip%2Flearn-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpletrontdip%2Flearn-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] deaeb3c108c9fa2cbb6a137ceac252c37ebc9821
[INFO] testing simpletrontdip/learn-rust against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145330-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsimpletrontdip%2Flearn-rust" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/simpletrontdip/learn-rust
[INFO] finished tweaking git repo https://github.com/simpletrontdip/learn-rust
[INFO] tweaked toml for git repo https://github.com/simpletrontdip/learn-rust written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/simpletrontdip/learn-rust on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/simpletrontdip/learn-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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 576da5530d1fe60cd60c409d1ed9fdd8760e4c00889af793d6d0589d9f5ebcb2
[INFO] running `Command { std: "docker" "start" "-a" "576da5530d1fe60cd60c409d1ed9fdd8760e4c00889af793d6d0589d9f5ebcb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "576da5530d1fe60cd60c409d1ed9fdd8760e4c00889af793d6d0589d9f5ebcb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "576da5530d1fe60cd60c409d1ed9fdd8760e4c00889af793d6d0589d9f5ebcb2", kill_on_drop: false }`
[INFO] [stdout] 576da5530d1fe60cd60c409d1ed9fdd8760e4c00889af793d6d0589d9f5ebcb2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cf92c68d7a17d96128f84ac80f32f0d27402a2ce370b25cede8510e77ae497f0
[INFO] running `Command { std: "docker" "start" "-a" "cf92c68d7a17d96128f84ac80f32f0d27402a2ce370b25cede8510e77ae497f0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling libc v0.2.159
[INFO] [stderr]    Compiling cfg-if v1.0.0
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[INFO] [stderr]    Compiling pin-project-lite v0.2.15
[INFO] [stderr]    Compiling futures-sink v0.3.31
[INFO] [stderr]    Compiling httparse v1.9.5
[INFO] [stderr]    Compiling futures-core v0.3.31
[INFO] [stderr]    Compiling itoa v1.0.11
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling anyhow v1.0.89
[INFO] [stderr]    Compiling thiserror v1.0.64
[INFO] [stderr]    Compiling base64 v0.22.1
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling http v1.1.0
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling fastrand v2.2.0
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling sha1_smol v1.0.1
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling mio v1.0.2
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling thiserror-impl v1.0.64
[INFO] [stderr]    Compiling tokio v1.41.0
[INFO] [stderr]    Compiling zerocopy v0.7.35
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling ppv-lite86 v0.2.20
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling tokio-util v0.7.12
[INFO] [stderr]    Compiling tokio-websockets v0.10.1
[INFO] [stderr]    Compiling learn-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::result`
[INFO] [stdout]  --> src/bin/server.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::result;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error`
[INFO] [stdout]  --> src/errorresult.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::error;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicBool` and `Ordering`
[INFO] [stdout]  --> src/philosophers.rs:2:25
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::atomic::{AtomicBool, Ordering};
[INFO] [stdout]   |                         ^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `JoinHandle`
[INFO] [stdout]  --> src/philosophers.rs:4:25
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::thread::{self, JoinHandle};
[INFO] [stdout]   |                         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `oneshot`
[INFO] [stdout]  --> src/philotokio.rs:6:25
[INFO] [stdout]   |
[INFO] [stdout] 6 | use tokio::sync::{mpsc, oneshot, Mutex};
[INFO] [stdout]   |                         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::task::JoinHandle`
[INFO] [stdout]  --> src/philotokio.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use tokio::task::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::task::spawn`
[INFO] [stdout]  --> src/tasks.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::task::spawn;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/bst.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node<T: Ord> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/bst.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T: Ord> Node<T> {
[INFO] [stdout]    | -------------------- associated function in this implementation
[INFO] [stdout] 12 |     fn new(value: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Subtree` is never constructed
[INFO] [stdout]   --> src/bst.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Subtree<T: Ord>(Option<Box<Node<T>>>);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BinaryTree` is never constructed
[INFO] [stdout]   --> src/bst.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct BinaryTree<T: Ord> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]   --> src/bst.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl<T: Ord> BinaryTree<T> {
[INFO] [stdout]    | -------------------------- associated items in this implementation
[INFO] [stdout] 34 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |     fn insert(&mut self, value: T) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 44 |     fn has(&self, value: &T) -> bool {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn in_order_iter<'a>(&'a self) -> Box<dyn Iterator<Item = &'a T> + 'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 55 |     fn pre_order_iter<'a>(&'a self) -> Box<dyn Iterator<Item = &'a T> + 'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 58 |     fn post_order_iter<'a>(&'a self) -> Box<dyn Iterator<Item = &'a T> + 'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/bst.rs:65:8
[INFO] [stdout]     |
[INFO] [stdout]  64 | impl<T: Ord> Subtree<T> {
[INFO] [stdout]     | ----------------------- associated items in this implementation
[INFO] [stdout]  65 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  69 |     fn insert(&mut self, value: T) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  80 |     fn has(&self, value: &T) -> bool {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  91 |     fn len(&self) -> usize {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  98 |     fn in_order_iter<'a>(&'a self) -> Box<dyn Iterator<Item = &'a T> + 'a> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 110 |     fn pre_order_iter<'a>(&'a self) -> Box<dyn Iterator<Item = &'a T> + 'a> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 121 |     fn post_order_iter<'a>(&'a self) -> Box<dyn Iterator<Item = &'a T> + 'a> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Language` is never used
[INFO] [stdout]  --> src/builder.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Language {
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dependency` is never constructed
[INFO] [stdout]  --> src/builder.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Dependency {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Package` is never constructed
[INFO] [stdout]   --> src/builder.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Package {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `as_dependency` is never used
[INFO] [stdout]   --> src/builder.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl Package {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn as_dependency(&self) -> Dependency {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PackageBuilder` is never constructed
[INFO] [stdout]   --> src/builder.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct PackageBuilder(Package);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `version`, `authors`, `dependency`, `language`, and `build` are never used
[INFO] [stdout]   --> src/builder.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl PackageBuilder {
[INFO] [stdout]    | ------------------- associated items in this implementation
[INFO] [stdout] 39 |     fn new(name: impl Into<String>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn version(mut self, version: impl Into<String>) -> Self {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 58 |     fn authors(mut self, authors: Vec<String>) -> Self {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 |     fn dependency(mut self, dependency: Dependency) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     fn language(mut self, language: Language) -> Self {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 75 |     fn build(self) -> Package {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Op` is never used
[INFO] [stdout]  --> src/errorresult.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum Op {
[INFO] [stdout]   |      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Token` is never used
[INFO] [stdout]   --> src/errorresult.rs:18:6
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum Token {
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expression` is never used
[INFO] [stdout]   --> src/errorresult.rs:26:6
[INFO] [stdout]    |
[INFO] [stdout] 26 | enum Expression {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tokenize` is never used
[INFO] [stdout]   --> src/errorresult.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn tokenize(input: &str) -> Tokenizer {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tokenizer` is never constructed
[INFO] [stdout]   --> src/errorresult.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Tokenizer<'a>(Peekable<Chars<'a>>);
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `collect_number` and `collect_identifier` are never used
[INFO] [stdout]   --> src/errorresult.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl<'a> Tokenizer<'a> {
[INFO] [stdout]    | ---------------------- methods in this implementation
[INFO] [stdout] 42 |     fn collect_number(&mut self, first_char: char) -> Token {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     fn collect_identifier(&mut self, first_char: char) -> Token {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TokenizeError` is never used
[INFO] [stdout]   --> src/errorresult.rs:62:6
[INFO] [stdout]    |
[INFO] [stdout] 62 | enum TokenizeError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParseError` is never used
[INFO] [stdout]   --> src/errorresult.rs:68:6
[INFO] [stdout]    |
[INFO] [stdout] 68 | enum ParseError {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]   --> src/errorresult.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn parse(input: &str) -> Result<Expression, ParseError> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `EvalError` is never used
[INFO] [stdout]    --> src/errorresult.rs:132:6
[INFO] [stdout]     |
[INFO] [stdout] 132 | enum EvalError {
[INFO] [stdout]     |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval` is never used
[INFO] [stdout]    --> src/errorresult.rs:139:4
[INFO] [stdout]     |
[INFO] [stdout] 139 | fn eval(expression: &Expression, context: &HashMap<String, i32>) -> Result<f64, EvalError> {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `min` is never used
[INFO] [stdout]  --> src/expression.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn min<T>(a: T, b: T) -> T
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Operation` is never used
[INFO] [stdout]   --> src/expression.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Operation {
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expression` is never used
[INFO] [stdout]   --> src/expression.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Expression {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval` is never used
[INFO] [stdout]   --> src/expression.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn eval(e: Expression) -> Result<i64, String> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `offset_differences` is never used
[INFO] [stdout]  --> src/iterators.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn offset_differences<N>(offset: usize, values: Vec<N>) -> Vec<N>
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `luhn` is never used
[INFO] [stdout]  --> src/luhn.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn luhn(cc_number: &str) -> bool {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Widget` is never used
[INFO] [stdout]  --> src/migui.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Widget {
[INFO] [stdout]   |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Label` is never constructed
[INFO] [stdout]   --> src/migui.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub struct Label {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/migui.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl Label {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 21 |     fn new(label: &str) -> Label {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Button` is never constructed
[INFO] [stdout]   --> src/migui.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub struct Button {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/migui.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl Button {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 33 |     fn new(label: &str) -> Button {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Window` is never constructed
[INFO] [stdout]   --> src/migui.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub struct Window {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_widget`, and `inner_width` are never used
[INFO] [stdout]   --> src/migui.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl Window {
[INFO] [stdout]    | ----------- associated items in this implementation
[INFO] [stdout] 46 |     fn new(title: &str) -> Window {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 53 |     fn add_widget(&mut self, widget: Box<dyn Widget>) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn inner_width(&self) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Fork` is never constructed
[INFO] [stdout]  --> src/philosophers.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Fork(usize);
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ControlMsg` is never used
[INFO] [stdout]   --> src/philosophers.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum ControlMsg {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Philosopher` is never constructed
[INFO] [stdout]   --> src/philosophers.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct Philosopher {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Stats` is never constructed
[INFO] [stdout]   --> src/philosophers.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Stats {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `run`, `think`, and `eat` are never used
[INFO] [stdout]   --> src/philosophers.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Philosopher {
[INFO] [stdout]    | ---------------- methods in this implementation
[INFO] [stdout] 30 |     fn run(&self, stats: &mut Stats) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn think(&self, stats: &mut Stats) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     fn eat(&self, stats: &mut Stats) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `PHILOSOPHERS` is never used
[INFO] [stdout]   --> src/philosophers.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 | static PHILOSOPHERS: &[&str] = &["Socrates", "Hypatia", "Plato", "Aristotle", "Pythagoras"];
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Fork` is never constructed
[INFO] [stdout]   --> src/philotokio.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Fork(usize);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ControlMsg` is never used
[INFO] [stdout]   --> src/philotokio.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum ControlMsg {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Philosopher` is never constructed
[INFO] [stdout]   --> src/philotokio.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct Philosopher {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Stats` is never constructed
[INFO] [stdout]   --> src/philotokio.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct Stats {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `run`, `think`, and `eat` are never used
[INFO] [stdout]   --> src/philotokio.rs:33:14
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl Philosopher {
[INFO] [stdout]    | ---------------- methods in this implementation
[INFO] [stdout] 33 |     async fn run(&self, stats: &mut Stats) {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     async fn think(&self, stats: &mut Stats) {
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 56 |     async fn eat(&self, stats: &mut Stats) {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `PHILOSOPHERS` is never used
[INFO] [stdout]   --> src/philotokio.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 | static PHILOSOPHERS: &[&str] = &["Socrates", "Hypatia", "Plato", "Aristotle", "Pythagoras"];
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RotDecoder` is never constructed
[INFO] [stdout]  --> src/rot13.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct RotDecoder<R: Read> {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RotEncoder` is never constructed
[INFO] [stdout]  --> src/rot13.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct RotEncoder<W: Write> {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `X` is never constructed
[INFO] [stdout]  --> src/traits.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct X(u32);
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Y` is never constructed
[INFO] [stdout]  --> src/traits.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Y(u32);
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Z` is never constructed
[INFO] [stdout]  --> src/traits.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Z(u32);
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Type` is never used
[INFO] [stdout]  --> src/traits.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | trait Type {
[INFO] [stdout]   |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Work` is never constructed
[INFO] [stdout]  --> src/tasks.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Work {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_sleep` is never used
[INFO] [stdout]   --> src/tasks.rs:13:10
[INFO] [stdout]    |
[INFO] [stdout] 13 | async fn new_sleep() {
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `worker` is never used
[INFO] [stdout]   --> src/tasks.rs:20:10
[INFO] [stdout]    |
[INFO] [stdout] 20 | async fn worker(mut work_queue: mpsc::Receiver<Work>) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_work` is never used
[INFO] [stdout]   --> src/tasks.rs:46:10
[INFO] [stdout]    |
[INFO] [stdout] 46 | async fn do_work(work_queue: &mpsc::Sender<Work>, input: u32) -> u32 {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/borrowing.rs:35:25
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport {
[INFO] [stdout]    |                         ^^^^^^^^^ the lifetime is elided here     ------------ the same lifetime is hidden 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] 35 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport<'_> {
[INFO] [stdout]    |                                                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/borrowing.rs:157:22
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn parse_field(data: &[u8]) -> (Field, &[u8]) {
[INFO] [stdout]     |                      ^^^^^      -----  ----- the same lifetime is elided here
[INFO] [stdout]     |                      |          |
[INFO] [stdout]     |                      |          the same lifetime is hidden here
[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] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn parse_field(data: &[u8]) -> (Field<'_>, &[u8]) {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/errorresult.rs:35:20
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn tokenize(input: &str) -> Tokenizer {
[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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn tokenize(input: &str) -> Tokenizer<'_> {
[INFO] [stdout]    |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.68s
[INFO] running `Command { std: "docker" "inspect" "cf92c68d7a17d96128f84ac80f32f0d27402a2ce370b25cede8510e77ae497f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf92c68d7a17d96128f84ac80f32f0d27402a2ce370b25cede8510e77ae497f0", kill_on_drop: false }`
[INFO] [stdout] cf92c68d7a17d96128f84ac80f32f0d27402a2ce370b25cede8510e77ae497f0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 761e88b0df667bbcb53c785bb2dc7528573a7c69048987b2ef00cb0d98d826d1
[INFO] running `Command { std: "docker" "start" "-a" "761e88b0df667bbcb53c785bb2dc7528573a7c69048987b2ef00cb0d98d826d1", kill_on_drop: false }`
[INFO] [stderr]    Compiling learn-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::result`
[INFO] [stdout]  --> src/bin/server.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::result;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error`
[INFO] [stdout]  --> src/errorresult.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::error;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicBool` and `Ordering`
[INFO] [stdout]  --> src/philosophers.rs:2:25
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::atomic::{AtomicBool, Ordering};
[INFO] [stdout]   |                         ^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Java` and `Perl` are never constructed
[INFO] [stdout]  --> src/builder.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Language {
[INFO] [stdout]   |      -------- variants in this enum
[INFO] [stdout] 3 |     Rust,
[INFO] [stdout] 4 |     Java,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 5 |     Perl,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Language` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `version_expression` are never read
[INFO] [stdout]   --> src/builder.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | struct Dependency {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 10 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     version_expression: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Dependency` 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: field `0` is never read
[INFO] [stdout]  --> src/philosophers.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Fork(usize);
[INFO] [stdout]   |        ---- ^^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `Fork` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Run` is never constructed
[INFO] [stdout]   --> src/philosophers.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum ControlMsg {
[INFO] [stdout]    |      ---------- variant in this enum
[INFO] [stdout] 11 |     Run,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> src/philosophers.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Stats {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 24 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Stats` 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 `0` is never read
[INFO] [stdout]   --> src/philotokio.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Fork(usize);
[INFO] [stdout]    |        ---- ^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `Fork` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ControlMsg` is never used
[INFO] [stdout]   --> src/philotokio.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum ControlMsg {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> src/philotokio.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct Stats {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 27 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Stats` 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 `0` is never read
[INFO] [stdout]  --> src/traits.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct X(u32);
[INFO] [stdout]   |        - ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/traits.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Y(u32);
[INFO] [stdout]   |        - ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/traits.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Z(u32);
[INFO] [stdout]   |        - ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/borrowing.rs:35:25
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport {
[INFO] [stdout]    |                         ^^^^^^^^^ the lifetime is elided here     ------------ the same lifetime is hidden 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] 35 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport<'_> {
[INFO] [stdout]    |                                                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/borrowing.rs:157:22
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn parse_field(data: &[u8]) -> (Field, &[u8]) {
[INFO] [stdout]     |                      ^^^^^      -----  ----- the same lifetime is elided here
[INFO] [stdout]     |                      |          |
[INFO] [stdout]     |                      |          the same lifetime is hidden here
[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] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn parse_field(data: &[u8]) -> (Field<'_>, &[u8]) {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/errorresult.rs:35:20
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn tokenize(input: &str) -> Tokenizer {
[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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn tokenize(input: &str) -> Tokenizer<'_> {
[INFO] [stdout]    |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.49s
[INFO] running `Command { std: "docker" "inspect" "761e88b0df667bbcb53c785bb2dc7528573a7c69048987b2ef00cb0d98d826d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "761e88b0df667bbcb53c785bb2dc7528573a7c69048987b2ef00cb0d98d826d1", kill_on_drop: false }`
[INFO] [stdout] 761e88b0df667bbcb53c785bb2dc7528573a7c69048987b2ef00cb0d98d826d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ed0440e680d6d549aeff2971bbcb5503d18677d0fa1e009a94efe6d28f978bcf
[INFO] running `Command { std: "docker" "start" "-a" "ed0440e680d6d549aeff2971bbcb5503d18677d0fa1e009a94efe6d28f978bcf", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::error`
[INFO] [stderr]  --> src/errorresult.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::error;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `AtomicBool` and `Ordering`
[INFO] [stderr]  --> src/philosophers.rs:2:25
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::sync::atomic::{AtomicBool, Ordering};
[INFO] [stderr]   |                         ^^^^^^^^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Java` and `Perl` are never constructed
[INFO] [stderr]  --> src/builder.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum Language {
[INFO] [stderr]   |      -------- variants in this enum
[INFO] [stderr] 3 |     Rust,
[INFO] [stderr] 4 |     Java,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 5 |     Perl,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `Language` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `name` and `version_expression` are never read
[INFO] [stderr]   --> src/builder.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr]  9 | struct Dependency {
[INFO] [stderr]    |        ---------- fields in this struct
[INFO] [stderr] 10 |     name: String,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 11 |     version_expression: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Dependency` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]  --> src/philosophers.rs:8:13
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct Fork(usize);
[INFO] [stderr]   |        ---- ^^^^^
[INFO] [stderr]   |        |
[INFO] [stderr]   |        field in this struct
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing this field
[INFO] [stderr]   = note: `Fork` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: variant `Run` is never constructed
[INFO] [stderr]   --> src/philosophers.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | enum ControlMsg {
[INFO] [stderr]    |      ---------- variant in this enum
[INFO] [stderr] 11 |     Run,
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `name` is never read
[INFO] [stderr]   --> src/philosophers.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct Stats {
[INFO] [stderr]    |        ----- field in this struct
[INFO] [stderr] 24 |     name: String,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Stats` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/philotokio.rs:11:13
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Fork(usize);
[INFO] [stderr]    |        ---- ^^^^^
[INFO] [stderr]    |        |
[INFO] [stderr]    |        field in this struct
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider removing this field
[INFO] [stderr]    = note: `Fork` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: enum `ControlMsg` is never used
[INFO] [stderr]   --> src/philotokio.rs:13:6
[INFO] [stderr]    |
[INFO] [stderr] 13 | enum ControlMsg {
[INFO] [stderr]    |      ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `name` is never read
[INFO] [stderr]   --> src/philotokio.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct Stats {
[INFO] [stderr]    |        ----- field in this struct
[INFO] [stderr] 27 |     name: String,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Stats` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]  --> src/traits.rs:1:10
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct X(u32);
[INFO] [stderr]   |        - ^^^
[INFO] [stderr]   |        |
[INFO] [stderr]   |        field in this struct
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing this field
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]  --> src/traits.rs:2:10
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct Y(u32);
[INFO] [stderr]   |        - ^^^
[INFO] [stderr]   |        |
[INFO] [stderr]   |        field in this struct
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing this field
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]  --> src/traits.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct Z(u32);
[INFO] [stderr]   |        - ^^^
[INFO] [stderr]   |        |
[INFO] [stderr]   |        field in this struct
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing this field
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/borrowing.rs:35:25
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport {
[INFO] [stderr]    |                         ^^^^^^^^^ the lifetime is elided here     ------------ the same lifetime is hidden here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport<'_> {
[INFO] [stderr]    |                                                                               ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/borrowing.rs:157:22
[INFO] [stderr]     |
[INFO] [stderr] 157 | fn parse_field(data: &[u8]) -> (Field, &[u8]) {
[INFO] [stderr]     |                      ^^^^^      -----  ----- the same lifetime is elided here
[INFO] [stderr]     |                      |          |
[INFO] [stderr]     |                      |          the same lifetime is hidden here
[INFO] [stderr]     |                      the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 157 | fn parse_field(data: &[u8]) -> (Field<'_>, &[u8]) {
[INFO] [stderr]     |                                      ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/errorresult.rs:35:20
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn tokenize(input: &str) -> Tokenizer {
[INFO] [stderr]    |                    ^^^^     --------- the same lifetime is hidden here
[INFO] [stderr]    |                    |
[INFO] [stderr]    |                    the lifetime is elided here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn tokenize(input: &str) -> Tokenizer<'_> {
[INFO] [stderr]    |                                      ++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::result`
[INFO] [stderr]  --> src/bin/server.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::result;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `learn-rust` (bin "learn-rust" test) generated 16 warnings (run `cargo fix --bin "learn-rust" --tests` to apply 5 suggestions)
[INFO] [stderr] warning: `learn-rust` (bin "server" test) generated 1 warning (run `cargo fix --bin "server" --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running unittests src/bin/client.rs (/opt/rustwide/target/debug/deps/client-be67cba77aeb3097)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/learn_rust-4e8a96d1b98b6a12)
[INFO] [stdout] 
[INFO] [stdout] running 39 tests
[INFO] [stdout] test borrowing::test_visit ... ok
[INFO] [stdout] test borrowing::test_proto ... ok
[INFO] [stdout] test bst::tests::len ... ok
[INFO] [stdout] test bst::tests::test_iter ... ok
[INFO] [stdout] test bst::tests::unbalanced ... ok
[INFO] [stdout] test builder::main ... ok
[INFO] [stdout] test bst::tests::has ... ok
[INFO] [stdout] test errorresult::test::test_eval_exceptions ... ok
[INFO] [stdout] test errorresult::test::test_catch_all_exception ... ok
[INFO] [stdout] test expression::test_add ... ok
[INFO] [stdout] test errorresult::test::test_parse_expressions ... ok
[INFO] [stdout] test errorresult::test::test_eval_expressions ... ok
[INFO] [stdout] test expression::test_error ... ok
[INFO] [stdout] test expression::test_generic ... ok
[INFO] [stdout] test expression::test_recursion ... ok
[INFO] [stdout] test expression::test_recursion_error ... ok
[INFO] [stdout] test expression::test_sum ... ok
[INFO] [stdout] test expression::test_value ... ok
[INFO] [stdout] test iterators::test_custom_type ... ok
[INFO] [stdout] test iterators::test_degenerate_cases ... ok
[INFO] [stdout] test iterators::test_larger_offsets ... ok
[INFO] [stdout] test luhn::test::test_empty_number ... ok
[INFO] [stdout] test luhn::test::test_invalid_cc_number ... ok
[INFO] [stdout] test iterators::test_offset_one ... ok
[INFO] [stdout] test luhn::test::test_invalid_characters ... ok
[INFO] [stdout] test luhn::test::test_too_short_number ... ok
[INFO] [stdout] test migui::test_migui ... ok
[INFO] [stdout] test luhn::test::test_valid_cc_number ... ok
[INFO] [stdout] test rot13::test::binary ... ok
[INFO] [stdout] test rot13::test::joke ... ok
[INFO] [stdout] test rot13::test::test_encode_decode ... ok
[INFO] [stdout] test traits::test_trait_impl_box ... ok
[INFO] [stdout] test traits::test_trait_impl ... ok
[INFO] [stdout] test unsafeffi::test_ffi ... ok
[INFO] [stdout] test unsafeffi::test_nonexisting_directory ... ok
[INFO] [stdout] test tasks::test_select ... ok
[INFO] [stdout] test tasks::test_main ... ok
[INFO] [stdout] test philotokio::test_main ... ok
[INFO] [stdout] test philosophers::test_main ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 39 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.07s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/server.rs (/opt/rustwide/target/debug/deps/server-8b72f87eced1afb1)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ed0440e680d6d549aeff2971bbcb5503d18677d0fa1e009a94efe6d28f978bcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed0440e680d6d549aeff2971bbcb5503d18677d0fa1e009a94efe6d28f978bcf", kill_on_drop: false }`
[INFO] [stdout] ed0440e680d6d549aeff2971bbcb5503d18677d0fa1e009a94efe6d28f978bcf