[INFO] fetching crate learn_rust_bugs 0.1.0...
[INFO] testing learn_rust_bugs-0.1.0 against try#0abe69e6c16114311cc2700e972492e64d69c28f for pr-154065-1
[INFO] extracting crate learn_rust_bugs 0.1.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate learn_rust_bugs 0.1.0
[INFO] finished tweaking crates.io crate learn_rust_bugs 0.1.0
[INFO] tweaked toml for crates.io crate learn_rust_bugs 0.1.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate learn_rust_bugs 0.1.0 on toolchain 0abe69e6c16114311cc2700e972492e64d69c28f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate learn_rust_bugs 0.1.0 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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2d213bc59fed5c726087077fde60b92041cfc182b94505c4dc5783d9a80f31b0
[INFO] running `Command { std: "docker" "start" "-a" "2d213bc59fed5c726087077fde60b92041cfc182b94505c4dc5783d9a80f31b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d213bc59fed5c726087077fde60b92041cfc182b94505c4dc5783d9a80f31b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d213bc59fed5c726087077fde60b92041cfc182b94505c4dc5783d9a80f31b0", kill_on_drop: false }`
[INFO] [stdout] 2d213bc59fed5c726087077fde60b92041cfc182b94505c4dc5783d9a80f31b0
[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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9c81b8669dffd0e30df0c0ef77693eb4ea14e1fe502c6917b9f862fecf2f107
[INFO] running `Command { std: "docker" "start" "-a" "b9c81b8669dffd0e30df0c0ef77693eb4ea14e1fe502c6917b9f862fecf2f107", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling regex-syntax v0.6.28
[INFO] [stderr]    Compiling termcolor v1.2.0
[INFO] [stderr]    Compiling humantime v2.1.0
[INFO] [stderr]    Compiling aho-corasick v0.7.20
[INFO] [stderr]    Compiling regex v1.7.1
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling env_logger v0.9.3
[INFO] [stderr]    Compiling learn_rust_bugs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/locks.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/state_pattern/states.rs:6:27
[INFO] [stdout]   |
[INFO] [stdout] 6 |     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 `MyBox` is never constructed
[INFO] [stdout]  --> src/boxs/deref.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct MyBox<T>(T);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/boxs/deref.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: function `mybox_test` is never used
[INFO] [stdout]   --> src/boxs/deref.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn mybox_test() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/boxs/linked_list.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 8 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `MessageSender` is never used
[INFO] [stdout]  --> src/boxs/refcells.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | trait MessageSender {
[INFO] [stdout]   |       ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LimitChecker` is never constructed
[INFO] [stdout]  --> src/boxs/refcells.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct LimitChecker<'a, T>
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `set_value` are never used
[INFO] [stdout]   --> src/boxs/refcells.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | / impl<'a, T> LimitChecker<'a, T>
[INFO] [stdout] 18 | | where
[INFO] [stdout] 19 | |     T: MessageSender,
[INFO] [stdout]    | |_____________________- associated items in this implementation
[INFO] [stdout] 20 |   {
[INFO] [stdout] 21 |       pub fn new(message_sender: &'a T, max: usize) -> LimitChecker<'a, T> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value`, `parent`, and `children` are never read
[INFO] [stdout]  --> src/boxs/trees.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Node {
[INFO] [stdout]   |            ---- fields in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tree_test` is never used
[INFO] [stdout]   --> src/boxs/trees.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn tree_test() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]  --> src/state_pattern.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Post {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `request_review`, `approve`, and `content` are never used
[INFO] [stdout]   --> src/state_pattern.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout]  8 | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout]  9 |     pub fn new() -> Post {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn add_text(&mut self, msg: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn request_review(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn approve(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn content(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]  --> src/state_pattern/states.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub trait State {
[INFO] [stdout]   |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]   --> src/state_pattern/states.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Draft {}
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]   --> src/state_pattern/states.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct PendingReview {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Approved` is never constructed
[INFO] [stdout]   --> src/state_pattern/states.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Approved {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `COUNT` is never used
[INFO] [stdout]   --> src/unsafes.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 | static mut COUNT: u32 = 0;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.15s
[INFO] running `Command { std: "docker" "inspect" "b9c81b8669dffd0e30df0c0ef77693eb4ea14e1fe502c6917b9f862fecf2f107", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9c81b8669dffd0e30df0c0ef77693eb4ea14e1fe502c6917b9f862fecf2f107", kill_on_drop: false }`
[INFO] [stdout] b9c81b8669dffd0e30df0c0ef77693eb4ea14e1fe502c6917b9f862fecf2f107
[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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 39b589f27030b9aff8dff9ed3ed95684ad0e1f55346e78fda0cb9a4a936ef39a
[INFO] running `Command { std: "docker" "start" "-a" "39b589f27030b9aff8dff9ed3ed95684ad0e1f55346e78fda0cb9a4a936ef39a", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/locks.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/state_pattern/states.rs:6:27
[INFO] [stdout]   |
[INFO] [stdout] 6 |     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 `MyBox` is never constructed
[INFO] [stdout]  --> src/boxs/deref.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct MyBox<T>(T);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/boxs/deref.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: function `mybox_test` is never used
[INFO] [stdout]   --> src/boxs/deref.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn mybox_test() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/boxs/linked_list.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 8 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `MessageSender` is never used
[INFO] [stdout]  --> src/boxs/refcells.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | trait MessageSender {
[INFO] [stdout]   |       ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LimitChecker` is never constructed
[INFO] [stdout]  --> src/boxs/refcells.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct LimitChecker<'a, T>
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `set_value` are never used
[INFO] [stdout]   --> src/boxs/refcells.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | / impl<'a, T> LimitChecker<'a, T>
[INFO] [stdout] 18 | | where
[INFO] [stdout] 19 | |     T: MessageSender,
[INFO] [stdout]    | |_____________________- associated items in this implementation
[INFO] [stdout] 20 |   {
[INFO] [stdout] 21 |       pub fn new(message_sender: &'a T, max: usize) -> LimitChecker<'a, T> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value`, `parent`, and `children` are never read
[INFO] [stdout]  --> src/boxs/trees.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Node {
[INFO] [stdout]   |            ---- fields in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tree_test` is never used
[INFO] [stdout]   --> src/boxs/trees.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn tree_test() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]  --> src/state_pattern.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Post {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `request_review`, `approve`, and `content` are never used
[INFO] [stdout]   --> src/state_pattern.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout]  8 | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout]  9 |     pub fn new() -> Post {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn add_text(&mut self, msg: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn request_review(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn approve(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn content(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]  --> src/state_pattern/states.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub trait State {
[INFO] [stdout]   |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]   --> src/state_pattern/states.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Draft {}
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]   --> src/state_pattern/states.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct PendingReview {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Approved` is never constructed
[INFO] [stdout]   --> src/state_pattern/states.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Approved {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `COUNT` is never used
[INFO] [stdout]   --> src/unsafes.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 | static mut COUNT: u32 = 0;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling learn_rust_bugs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/locks.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `point`
[INFO] [stdout]  --> tests/integration_test.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let point = Point::new(1, 2);
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_point`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/state_pattern/states.rs:6:27
[INFO] [stdout]   |
[INFO] [stdout] 6 |     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 `MyBox` is never constructed
[INFO] [stdout]  --> src/boxs/deref.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct MyBox<T>(T);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/boxs/deref.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: function `mybox_test` is never used
[INFO] [stdout]   --> src/boxs/deref.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn mybox_test() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/boxs/linked_list.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 8 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value`, `parent`, and `children` are never read
[INFO] [stdout]  --> src/boxs/trees.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Node {
[INFO] [stdout]   |            ---- fields in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tree_test` is never used
[INFO] [stdout]   --> src/boxs/trees.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn tree_test() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `COUNT` is never used
[INFO] [stdout]   --> src/unsafes.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 | static mut COUNT: u32 = 0;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `Command { std: "docker" "inspect" "39b589f27030b9aff8dff9ed3ed95684ad0e1f55346e78fda0cb9a4a936ef39a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39b589f27030b9aff8dff9ed3ed95684ad0e1f55346e78fda0cb9a4a936ef39a", kill_on_drop: false }`
[INFO] [stdout] 39b589f27030b9aff8dff9ed3ed95684ad0e1f55346e78fda0cb9a4a936ef39a
[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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] dfc47e1b926d142179a72011e3b82a98f63906524b68e2e3b1a715dd30ddbf04
[INFO] running `Command { std: "docker" "start" "-a" "dfc47e1b926d142179a72011e3b82a98f63906524b68e2e3b1a715dd30ddbf04", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/locks.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `post`
[INFO] [stderr]  --> src/state_pattern/states.rs:6:27
[INFO] [stderr]   |
[INFO] [stderr] 6 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stderr]   |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `MyBox` is never constructed
[INFO] [stderr]  --> src/boxs/deref.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct MyBox<T>(T);
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]  --> src/boxs/deref.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | impl<T> MyBox<T> {
[INFO] [stderr]   | ---------------- associated function in this implementation
[INFO] [stderr] 6 |     fn new(x: T) -> MyBox<T> {
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `mybox_test` is never used
[INFO] [stderr]   --> src/boxs/deref.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn mybox_test() {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0` and `1` are never read
[INFO] [stderr]  --> src/boxs/linked_list.rs:8:10
[INFO] [stderr]   |
[INFO] [stderr] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stderr]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stderr]   |     |
[INFO] [stderr]   |     fields in this variant
[INFO] [stderr]   |
[INFO] [stderr]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]   |
[INFO] [stderr] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stderr] 8 +     Cons((), ()),
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] warning: trait `MessageSender` is never used
[INFO] [stderr]  --> src/boxs/refcells.rs:4:7
[INFO] [stderr]   |
[INFO] [stderr] 4 | trait MessageSender {
[INFO] [stderr]   |       ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `LimitChecker` is never constructed
[INFO] [stderr]  --> src/boxs/refcells.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct LimitChecker<'a, T>
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new` and `set_value` are never used
[INFO] [stderr]   --> src/boxs/refcells.rs:21:12
[INFO] [stderr]    |
[INFO] [stderr] 17 | / impl<'a, T> LimitChecker<'a, T>
[INFO] [stderr] 18 | | where
[INFO] [stderr] 19 | |     T: MessageSender,
[INFO] [stderr]    | |_____________________- associated items in this implementation
[INFO] [stderr] 20 |   {
[INFO] [stderr] 21 |       pub fn new(message_sender: &'a T, max: usize) -> LimitChecker<'a, T> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] ...
[INFO] [stderr] 29 |       pub fn set_value(&mut self, value: usize) {
[INFO] [stderr]    |              ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `value`, `parent`, and `children` are never read
[INFO] [stderr]  --> src/boxs/trees.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Node {
[INFO] [stderr]   |            ---- fields in this struct
[INFO] [stderr] 6 |     value: i32,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: function `tree_test` is never used
[INFO] [stderr]   --> src/boxs/trees.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn tree_test() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Post` is never constructed
[INFO] [stderr]  --> src/state_pattern.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct Post {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `add_text`, `request_review`, `approve`, and `content` are never used
[INFO] [stderr]   --> src/state_pattern.rs:9:12
[INFO] [stderr]    |
[INFO] [stderr]  8 | impl Post {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr]  9 |     pub fn new() -> Post {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 15 |     pub fn add_text(&mut self, msg: &str) {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 18 |     pub fn request_review(&mut self) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 21 |     pub fn approve(&mut self) {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 24 |     pub fn content(&self) -> &str {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `State` is never used
[INFO] [stderr]  --> src/state_pattern/states.rs:3:11
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub trait State {
[INFO] [stderr]   |           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Draft` is never constructed
[INFO] [stderr]   --> src/state_pattern/states.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub struct Draft {}
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `PendingReview` is never constructed
[INFO] [stderr]   --> src/state_pattern/states.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | struct PendingReview {}
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Approved` is never constructed
[INFO] [stderr]   --> src/state_pattern/states.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | struct Approved {}
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static `COUNT` is never used
[INFO] [stderr]   --> src/unsafes.rs:47:12
[INFO] [stderr]    |
[INFO] [stderr] 47 | static mut COUNT: u32 = 0;
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `learn_rust_bugs` (lib) generated 18 warnings (run `cargo fix --lib -p learn_rust_bugs` to apply 2 suggestions)
[INFO] [stderr] warning: unused variable: `point`
[INFO] [stderr]  --> tests/integration_test.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let point = Point::new(1, 2);
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_point`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `learn_rust_bugs` (test "integration_test") generated 1 warning (run `cargo fix --test "integration_test" -p learn_rust_bugs` to apply 1 suggestion)
[INFO] [stderr] warning: `learn_rust_bugs` (lib test) generated 9 warnings (9 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/library-1973e33033f4eb62)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test boxs::refcells::test::limit_checker ... ok
[INFO] [stdout] test overload::test::add ... ok
[INFO] [stdout] test generics::test_point::test_larger ... ok
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/binary-26610bf20dfdb190)
[INFO] [stdout] test state_pattern::test::post ... ok
[INFO] [stdout] test generics::test_point::test_panic - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stderr]      Running tests/integration_test.rs (/opt/rustwide/target/debug/deps/integration_test-d4e7fae7c18d4628)
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_point ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests library
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/overload.rs - overload::MilliMeter (line 22) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.29s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "dfc47e1b926d142179a72011e3b82a98f63906524b68e2e3b1a715dd30ddbf04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfc47e1b926d142179a72011e3b82a98f63906524b68e2e3b1a715dd30ddbf04", kill_on_drop: false }`
[INFO] [stdout] dfc47e1b926d142179a72011e3b82a98f63906524b68e2e3b1a715dd30ddbf04
