[INFO] cloning repository https://github.com/Guang1234567/minigrep
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Guang1234567/minigrep" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGuang1234567%2Fminigrep", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGuang1234567%2Fminigrep'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3289e2a28e98db281f62bb1216a3b903cce19af4
[INFO] checking Guang1234567/minigrep against try#63132bd615c9bf75e93af8405d00064212331708 for pr-153975
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGuang1234567%2Fminigrep" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Guang1234567/minigrep
[INFO] finished tweaking git repo https://github.com/Guang1234567/minigrep
[INFO] tweaked toml for git repo https://github.com/Guang1234567/minigrep written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Guang1234567/minigrep on toolchain 63132bd615c9bf75e93af8405d00064212331708
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Guang1234567/minigrep already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking Guang1234567/minigrep against try#63132bd615c9bf75e93af8405d00064212331708 for pr-153975
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGuang1234567%2Fminigrep" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Guang1234567/minigrep
[INFO] finished tweaking git repo https://github.com/Guang1234567/minigrep
[INFO] tweaked toml for git repo https://github.com/Guang1234567/minigrep written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Guang1234567/minigrep on toolchain 63132bd615c9bf75e93af8405d00064212331708
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Guang1234567/minigrep already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-threadpool v0.1.16
[INFO] [stderr]   Downloaded log v0.4.8
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[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.17
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[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.17
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[INFO] [stderr]   Downloaded mio v0.6.19
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[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.17
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[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6b132fff84d73297026d6ec1d32162a55326734170e77e6ae34451b786c1ca5c
[INFO] running `Command { std: "docker" "start" "-a" "6b132fff84d73297026d6ec1d32162a55326734170e77e6ae34451b786c1ca5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b132fff84d73297026d6ec1d32162a55326734170e77e6ae34451b786c1ca5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b132fff84d73297026d6ec1d32162a55326734170e77e6ae34451b786c1ca5c", kill_on_drop: false }`
[INFO] [stdout] 6b132fff84d73297026d6ec1d32162a55326734170e77e6ae34451b786c1ca5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+63132bd615c9bf75e93af8405d00064212331708" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 945db8de52d6b3ba0001475ffc7ea885c9ef5eca317da723c6bd8cf09a10312a
[INFO] running `Command { std: "docker" "start" "-a" "945db8de52d6b3ba0001475ffc7ea885c9ef5eca317da723c6bd8cf09a10312a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]     Checking futures v0.1.29
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking lock_api v0.3.1
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling hyper v0.12.36
[INFO] [stderr]     Checking tokio-trace-core v0.1.0
[INFO] [stderr]     Checking try-lock v0.2.2
[INFO] [stderr]    Compiling indexmap v1.3.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking iovec v0.1.4
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[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]     Checking tokio-executor v0.1.8
[INFO] [stderr]     Checking tokio-sync v0.1.7
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]     Checking futures-cpupool v0.1.8
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking http v0.1.19
[INFO] [stderr]     Checking tokio-buf v0.1.1
[INFO] [stderr]     Checking string v0.2.1
[INFO] [stderr]     Checking tokio-threadpool v0.1.16
[INFO] [stderr]     Checking tokio-timer v0.2.11
[INFO] [stderr]     Checking tokio-current-thread v0.1.6
[INFO] [stderr]     Checking tokio-reactor v0.1.10
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio v0.1.19
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking http-body v0.1.0
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking minigrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/thread_pool/mod.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::error::Error;
[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::future::Future`
[INFO] [stdout]  --> src/thread_pool/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/print/mod.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{self, Write};
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]  --> src/thread_demo/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use super::*;
[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 imports: `Arc` and `Mutex`
[INFO] [stdout]    --> src/oop_demo/mod.rs:119:21
[INFO] [stdout]     |
[INFO] [stdout] 119 |     use std::sync::{Arc, Mutex};
[INFO] [stdout]     |                     ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::mpsc`
[INFO] [stdout]    --> src/oop_demo/mod.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |     use std::sync::mpsc;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]    --> src/oop_demo/mod.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |     use std::thread;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]    --> src/oop_demo/mod.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/server_demo/mod.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/thread_pool/mod.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/thread_pool/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/print/mod.rs:2:21
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{self, Write};
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/oop_demo/mod.rs:9:27
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]   |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]  --> src/cache/mod.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Cacher<T, R>
[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 items `new`, `value`, `value2`, `value3`, `is_some`, and `is_none` are never used
[INFO] [stdout]   --> src/cache/mod.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T, R> Cacher<T, R> {
[INFO] [stdout]    | ----------------------- associated items in this implementation
[INFO] [stdout] 12 |     fn new(calculation: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn value<U>(&mut self, arg: U) -> &R
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     fn value2<U>(&mut self, arg: U) -> &R
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 47 |     fn value3<U>(&mut self, arg: U) -> &R
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn is_some(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 |     fn is_none(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]  --> src/iterator/mod.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Counter {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/iterator/mod.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl Counter {
[INFO] [stdout]   | ------------ associated function in this implementation
[INFO] [stdout] 6 |     fn new() -> Counter {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyBox` is never constructed
[INFO] [stdout]  --> src/deref/mod.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct MyBox<T>(T);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/deref/mod.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl<T> MyBox<T> {
[INFO] [stdout]   | ---------------- associated function in this implementation
[INFO] [stdout] 6 |     fn new(x: T) -> MyBox<T> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/memory/mod.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ListMemoryLeak` is never used
[INFO] [stdout]   --> src/memory/mod.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum ListMemoryLeak<T> {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]   --> src/memory/mod.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T> ListMemoryLeak<T> {
[INFO] [stdout]    | ------------------------- method in this implementation
[INFO] [stdout] 16 |     fn tail(&self) -> Option<&RefCell<Rc<ListMemoryLeak<T>>>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ListRefVersion` is never used
[INFO] [stdout]  --> src/rc/mod.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum ListRefVersion<'a, T> {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ListRcVersion` is never used
[INFO] [stdout]   --> src/rc/mod.rs:11:6
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum ListRcVersion<T> {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ListRcRefVersion` is never used
[INFO] [stdout]   --> src/rc/mod.rs:17:6
[INFO] [stdout]    |
[INFO] [stdout] 17 | enum ListRcRefVersion<T> {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Messenger` is never used
[INFO] [stdout]  --> src/ref_demo/mod.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Messenger {
[INFO] [stdout]   |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LimitTracker` is never constructed
[INFO] [stdout]  --> src/ref_demo/mod.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LimitTracker<'a, T>
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `set_value` are never used
[INFO] [stdout]   --> src/ref_demo/mod.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | / impl<'a, T> LimitTracker<'a, T>
[INFO] [stdout] 14 | |     where
[INFO] [stdout] 15 | |         T: Messenger {
[INFO] [stdout]    | |____________________- associated items in this implementation
[INFO] [stdout] 16 |       pub fn new(messenger: &'a T, max: usize) -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |       pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/tree/mod.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]  --> src/oop_demo/mod.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | trait State: Debug {
[INFO] [stdout]   |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]   --> src/oop_demo/mod.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct Draft {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]   --> src/oop_demo/mod.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct PendingReview {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]   --> src/oop_demo/mod.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Published {}
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/oop_demo/mod.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Draft {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 24 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/oop_demo/mod.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl PendingReview {
[INFO] [stdout]    | ------------------ associated function in this implementation
[INFO] [stdout] 30 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/oop_demo/mod.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Published {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 36 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]   --> src/oop_demo/mod.rs:75:12
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub struct Post {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]    --> src/oop_demo/mod.rs:88:8
[INFO] [stdout]     |
[INFO] [stdout]  87 | impl Post {
[INFO] [stdout]     | --------- associated items in this implementation
[INFO] [stdout]  88 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  95 |     pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  99 |     pub fn content(&self) -> &str {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     pub fn request_review(&mut self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 109 |     pub fn approve(&mut self) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/thread_pool/mod.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct Worker {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 36 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Vector2D` is never constructed
[INFO] [stdout]  --> src/print/mod.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Vector2D {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/deref/mod.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let z = MyBox::new(String::from("Rust"));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/memory/mod.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let b = Cons(3, a.clone());
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/memory/mod.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::env;
[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::process`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::process;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::env;
[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 variable: `b`
[INFO] [stdout]   --> src/rc/mod.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::process;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/rc/mod.rs:58:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |             let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `producer`
[INFO] [stdout]   --> src/thread_demo/mod.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let producer = thread::spawn(move || {
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_producer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/oop_demo/mod.rs:9:27
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]   |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `value` and `value2` are never used
[INFO] [stdout]   --> src/cache/mod.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T, R> Cacher<T, R> {
[INFO] [stdout]    | ----------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn value<U>(&mut self, arg: U) -> &R
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     fn value2<U>(&mut self, arg: U) -> &R
[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 `0` and `1` are never read
[INFO] [stdout]  --> src/memory/mod.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Cons(i32, Rc<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 5 -     Cons(i32, Rc<List>),
[INFO] [stdout] 5 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]  --> src/rc/mod.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(T, &'a Box<ListRefVersion<'a, T>>),
[INFO] [stdout]   |     ----    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `ListRefVersion` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(T, &'a Box<ListRefVersion<'a, T>>),
[INFO] [stdout] 6 +     Cons(T, ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> src/rc/mod.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Cons(T, Rc<ListRcVersion<T>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ListRcVersion` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 12 -     Cons(T, Rc<ListRcVersion<T>>),
[INFO] [stdout] 12 +     Cons(T, ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/rc/mod.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 |     Cons(Rc<RefCell<T>>, Rc<ListRcRefVersion<T>>),
[INFO] [stdout]    |     ---- ^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ListRcRefVersion` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 18 -     Cons(Rc<RefCell<T>>, Rc<ListRcRefVersion<T>>),
[INFO] [stdout] 18 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]  --> src/tree/mod.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node<T> {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 6 |     value: T,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     parent: RefCell<Weak<Node<T>>>,
[INFO] [stdout] 8 |     children: RefCell<Vec<Rc<Node<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] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/thread_pool/mod.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct Worker {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 36 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/print/mod.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         writeln!(&mut some_writer, "{} - {}", 123, 789);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 88 |         let _ = writeln!(&mut some_writer, "{} - {}", 123, 789);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.41s
[INFO] running `Command { std: "docker" "inspect" "945db8de52d6b3ba0001475ffc7ea885c9ef5eca317da723c6bd8cf09a10312a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "945db8de52d6b3ba0001475ffc7ea885c9ef5eca317da723c6bd8cf09a10312a", kill_on_drop: false }`
[INFO] [stdout] 945db8de52d6b3ba0001475ffc7ea885c9ef5eca317da723c6bd8cf09a10312a
