[INFO] cloning repository https://github.com/tony612/rust-by-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tony612/rust-by-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftony612%2Frust-by-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftony612%2Frust-by-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 12770c03945679fc114a5ef5accc51c6ecc0e8f9
[INFO] testing tony612/rust-by-example against 1.76.0 for beta-1.77-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftony612%2Frust-by-example" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tony612/rust-by-example on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tony612/rust-by-example
[INFO] finished tweaking git repo https://github.com/tony612/rust-by-example
[INFO] tweaked toml for git repo https://github.com/tony612/rust-by-example written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/tony612/rust-by-example 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" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9d59f804a304dfc55a176cf8fe0b2eddcf6adf5740f0b246473fded34fadccb5
[INFO] running `Command { std: "docker" "start" "-a" "9d59f804a304dfc55a176cf8fe0b2eddcf6adf5740f0b246473fded34fadccb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d59f804a304dfc55a176cf8fe0b2eddcf6adf5740f0b246473fded34fadccb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d59f804a304dfc55a176cf8fe0b2eddcf6adf5740f0b246473fded34fadccb5", kill_on_drop: false }`
[INFO] [stdout] 9d59f804a304dfc55a176cf8fe0b2eddcf6adf5740f0b246473fded34fadccb5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0589635970b6bad12e3b664f48db6b4db9c152abe43c8a6839079a2aadee36e1
[INFO] running `Command { std: "docker" "start" "-a" "0589635970b6bad12e3b664f48db6b4db9c152abe43c8a6839079a2aadee36e1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling instant v0.1.9
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]    Compiling bytes v1.0.1
[INFO] [stderr]    Compiling pin-project-lite v0.2.6
[INFO] [stderr]    Compiling once_cell v1.7.2
[INFO] [stderr]    Compiling tokio v1.6.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling mio v0.7.11
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling tokio-macros v1.2.0
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]  --> src/lifetime/function.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn longest<'a>(s1: &'a String, s2: &'a String) -> &'a String {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pick_first` is never used
[INFO] [stdout]   --> src/lifetime/function.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn pick_first<'a>(s1: &'a String, _s2: &String) -> &'a String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyStruct` is never constructed
[INFO] [stdout]  --> src/lifetime/method.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct MyStruct {}
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `empty` and `msg` are never used
[INFO] [stdout]  --> src/lifetime/method.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl MyStruct {
[INFO] [stdout]   | ------------- methods in this implementation
[INFO] [stdout] 4 |     fn empty(&self, _msg: &str) -> &str {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 8 |     fn msg<'a>(&self, msg: &'a str) -> &'a str {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyStruct` is never constructed
[INFO] [stdout]  --> src/lifetime/struct.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct MyStruct<'a> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `empty` and `msg` are never used
[INFO] [stdout]   --> src/lifetime/struct.rs:6:8
[INFO] [stdout]    |
[INFO] [stdout] 5  | impl<'a> MyStruct<'a> {
[INFO] [stdout]    | --------------------- methods in this implementation
[INFO] [stdout] 6  |     fn empty(&self, _msg: &str) -> &str {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn msg<'b>(&self, msg: &'b str) -> &'b str {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hygiene` is never used
[INFO] [stdout]  --> src/macro/hygiene.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn hygiene() -> usize {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `across_scope` is never used
[INFO] [stdout]   --> src/macro/hygiene.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn across_scope() -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ref_mut` is never used
[INFO] [stdout]  --> src/pattern_match/ref.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn ref_mut(mut s: Option<&str>) -> Option<&str> {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ref_mut2` is never used
[INFO] [stdout]   --> src/pattern_match/ref.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn ref_mut2(mut s: Option<&str>) -> Option<&str> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ref_mut3` is never used
[INFO] [stdout]   --> src/pattern_match/ref.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn ref_mut3(s: Option<&str>) -> Option<&str> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `and_mut` is never used
[INFO] [stdout]   --> src/pattern_match/ref.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn and_mut(input: Option<&mut Foo>) -> Option<Foo> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/pointer/cell.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T> Cell<T> {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 12 |     pub fn new(value: T) -> Cell<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/pointer/rc.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<T> Rc<T> {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 17 |     fn new(value: T) -> Rc<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Shared` and `Exclusive` are never constructed
[INFO] [stdout]   --> src/pointer/refcell.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | enum RefState {
[INFO] [stdout]    |      -------- variants in this enum
[INFO] [stdout] 10 |     Unshared,
[INFO] [stdout] 11 |     Shared(usize),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 12 |     Exclusive,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RefState` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `borrow`, and `borrow_mut` are never used
[INFO] [stdout]   --> src/pointer/refcell.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<T> RefCell<T> {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 21 |     fn new(value: T) -> RefCell<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn borrow(&self) -> Option<Ref<T>>
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn borrow_mut(&self) -> Option<RefMut<T>>
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `send` is never used
[INFO] [stdout]   --> src/sync/mpsc.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl<T> Sender<T> {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 30 |     fn send(&self, v: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Receiver` is never constructed
[INFO] [stdout]   --> src/sync/mpsc.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 | struct Receiver<T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `recv` is never used
[INFO] [stdout]   --> src/sync/mpsc.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 71 | impl<T> Receiver<T> {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 72 |     fn recv(&mut self) -> Option<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `queue` is never read
[INFO] [stdout]   --> src/sync/mpsc.rs:96:5
[INFO] [stdout]    |
[INFO] [stdout] 95 | struct Inner<T> {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 96 |     queue: VecDeque<T>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `channel` is never used
[INFO] [stdout]    --> src/sync/mpsc.rs:105:4
[INFO] [stdout]     |
[INFO] [stdout] 105 | fn channel<T>() -> (Sender<T>, Receiver<T>) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `data` and `sender` are never read
[INFO] [stdout]   --> src/tokio/actor.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct ActorMessage<Request, Reply> {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 12 |     data: Request,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 13 |     sender: oneshot::Sender<Reply>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spawn` is never used
[INFO] [stdout]   --> src/tokio/actor.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn spawn<A: Actor>(mut actor: A, mailbox: usize) -> Pid<A::Request, A::Reply>
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `sender` is never read
[INFO] [stdout]   --> src/tokio/actor.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub struct Pid<Request, Reply> {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 37 |     sender: mpsc::Sender<ActorMessage<Request, Reply>>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Pid` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `send` is never used
[INFO] [stdout]   --> src/tokio/actor.rs:41:18
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl<Request, Reply> Pid<Request, Reply> {
[INFO] [stdout]    | ---------------------------------------- method in this implementation
[INFO] [stdout] 41 |     pub async fn send(&self, data: Request) -> Result<Reply> {
[INFO] [stdout]    |                  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `watch` is never used
[INFO] [stdout]  --> src/tokio/watch.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | async fn watch() -> Result<()> {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/pointer/rc.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             drop(inner);
[INFO] [stdout]    |             ^^^^^-----^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  argument has type `&RcInner<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> src/pointer/rc.rs:76:26
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { Box::from_raw(self.inner.as_ptr()) };
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { let _ = Box::from_raw(self.inner.as_ptr()); };
[INFO] [stdout]    |                          +++++++                                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.86s
[INFO] running `Command { std: "docker" "inspect" "0589635970b6bad12e3b664f48db6b4db9c152abe43c8a6839079a2aadee36e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0589635970b6bad12e3b664f48db6b4db9c152abe43c8a6839079a2aadee36e1", kill_on_drop: false }`
[INFO] [stdout] 0589635970b6bad12e3b664f48db6b4db9c152abe43c8a6839079a2aadee36e1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2685bdc68a405b76f80ef654ebbf0eb6aa7378d0d2a76e77051c6406dc92e147
[INFO] running `Command { std: "docker" "start" "-a" "2685bdc68a405b76f80ef654ebbf0eb6aa7378d0d2a76e77051c6406dc92e147", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/pointer/rc.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             drop(inner);
[INFO] [stdout]    |             ^^^^^-----^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  argument has type `&RcInner<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> src/pointer/rc.rs:76:26
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { Box::from_raw(self.inner.as_ptr()) };
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { let _ = Box::from_raw(self.inner.as_ptr()); };
[INFO] [stdout]    |                          +++++++                                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.74s
[INFO] running `Command { std: "docker" "inspect" "2685bdc68a405b76f80ef654ebbf0eb6aa7378d0d2a76e77051c6406dc92e147", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2685bdc68a405b76f80ef654ebbf0eb6aa7378d0d2a76e77051c6406dc92e147", kill_on_drop: false }`
[INFO] [stdout] 2685bdc68a405b76f80ef654ebbf0eb6aa7378d0d2a76e77051c6406dc92e147
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4d9ebc83a0939070188e2641ef92f6d6bff1da90ac61b3f78954f8ca826a4aea
[INFO] running `Command { std: "docker" "start" "-a" "4d9ebc83a0939070188e2641ef92f6d6bff1da90ac61b3f78954f8ca826a4aea", kill_on_drop: false }`
[INFO] [stderr] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stderr]   --> src/pointer/rc.rs:66:13
[INFO] [stderr]    |
[INFO] [stderr] 66 |             drop(inner);
[INFO] [stderr]    |             ^^^^^-----^
[INFO] [stderr]    |                  |
[INFO] [stderr]    |                  argument has type `&RcInner<T>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: use `let _ = ...` to ignore the expression or result
[INFO] [stderr]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stderr]   --> src/pointer/rc.rs:76:26
[INFO] [stderr]    |
[INFO] [stderr] 76 |                 unsafe { Box::from_raw(self.inner.as_ptr()) };
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 76 |                 unsafe { let _ = Box::from_raw(self.inner.as_ptr()); };
[INFO] [stderr]    |                          +++++++                                   +
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-by-example` (bin "rust-by-example" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_by_example-e8860ffe49b1797c)
[INFO] [stdout] 
[INFO] [stdout] running 31 tests
[INFO] [stdout] test lifetime::function::tests::test_partial_mark ... ok
[INFO] [stdout] test lifetime::function::tests::test_invalid ... ok
[INFO] [stdout] test lifetime::method::tests::test_other_lifetime ... ok
[INFO] [stdout] test lifetime::method::tests::test_self_lifetime ... ok
[INFO] [stderr] tcache_thread_shutdown(): unaligned tcache chunk detected
[INFO] [stdout] test lifetime::function::tests::test_valid ... ok
[INFO] [stdout] test lifetime::r#struct::tests::test_lifetime ... ok
[INFO] [stdout] test pattern_match::r#ref::it_works ... ok
[INFO] [stdout] test pattern_match::r#ref::it_works2 ... ok
[INFO] [stderr] error: test failed, to rerun pass `--bin rust-by-example`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/rust_by_example-e8860ffe49b1797c` (signal: 6, SIGABRT: process abort signal)
[INFO] running `Command { std: "docker" "inspect" "4d9ebc83a0939070188e2641ef92f6d6bff1da90ac61b3f78954f8ca826a4aea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d9ebc83a0939070188e2641ef92f6d6bff1da90ac61b3f78954f8ca826a4aea", kill_on_drop: false }`
[INFO] [stdout] 4d9ebc83a0939070188e2641ef92f6d6bff1da90ac61b3f78954f8ca826a4aea
[INFO] testing tony612/rust-by-example against beta-2024-02-10 for beta-1.77-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftony612%2Frust-by-example" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tony612/rust-by-example on toolchain beta-2024-02-10
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-02-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tony612/rust-by-example
[INFO] finished tweaking git repo https://github.com/tony612/rust-by-example
[INFO] tweaked toml for git repo https://github.com/tony612/rust-by-example written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/tony612/rust-by-example 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" "+beta-2024-02-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 316d0714a82f30632476fd5774e9c4578e4820a9d2204af52dda87feb3ac0945
[INFO] running `Command { std: "docker" "start" "-a" "316d0714a82f30632476fd5774e9c4578e4820a9d2204af52dda87feb3ac0945", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "316d0714a82f30632476fd5774e9c4578e4820a9d2204af52dda87feb3ac0945", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "316d0714a82f30632476fd5774e9c4578e4820a9d2204af52dda87feb3ac0945", kill_on_drop: false }`
[INFO] [stdout] 316d0714a82f30632476fd5774e9c4578e4820a9d2204af52dda87feb3ac0945
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6cc07566c960863bc13b6659d8693f9698021fb7d8bff74f4f15285a01aa0766
[INFO] running `Command { std: "docker" "start" "-a" "6cc07566c960863bc13b6659d8693f9698021fb7d8bff74f4f15285a01aa0766", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling instant v0.1.9
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]    Compiling once_cell v1.7.2
[INFO] [stderr]    Compiling bytes v1.0.1
[INFO] [stderr]    Compiling tokio v1.6.1
[INFO] [stderr]    Compiling pin-project-lite v0.2.6
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling mio v0.7.11
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling tokio-macros v1.2.0
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]  --> src/lifetime/function.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn longest<'a>(s1: &'a String, s2: &'a String) -> &'a String {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pick_first` is never used
[INFO] [stdout]   --> src/lifetime/function.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn pick_first<'a>(s1: &'a String, _s2: &String) -> &'a String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyStruct` is never constructed
[INFO] [stdout]  --> src/lifetime/method.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct MyStruct {}
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `empty` and `msg` are never used
[INFO] [stdout]  --> src/lifetime/method.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl MyStruct {
[INFO] [stdout]   | ------------- methods in this implementation
[INFO] [stdout] 4 |     fn empty(&self, _msg: &str) -> &str {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 8 |     fn msg<'a>(&self, msg: &'a str) -> &'a str {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyStruct` is never constructed
[INFO] [stdout]  --> src/lifetime/struct.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct MyStruct<'a> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `empty` and `msg` are never used
[INFO] [stdout]   --> src/lifetime/struct.rs:6:8
[INFO] [stdout]    |
[INFO] [stdout] 5  | impl<'a> MyStruct<'a> {
[INFO] [stdout]    | --------------------- methods in this implementation
[INFO] [stdout] 6  |     fn empty(&self, _msg: &str) -> &str {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn msg<'b>(&self, msg: &'b str) -> &'b str {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hygiene` is never used
[INFO] [stdout]  --> src/macro/hygiene.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn hygiene() -> usize {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `across_scope` is never used
[INFO] [stdout]   --> src/macro/hygiene.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn across_scope() -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ref_mut` is never used
[INFO] [stdout]  --> src/pattern_match/ref.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn ref_mut(mut s: Option<&str>) -> Option<&str> {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ref_mut2` is never used
[INFO] [stdout]   --> src/pattern_match/ref.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn ref_mut2(mut s: Option<&str>) -> Option<&str> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ref_mut3` is never used
[INFO] [stdout]   --> src/pattern_match/ref.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn ref_mut3(s: Option<&str>) -> Option<&str> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `and_mut` is never used
[INFO] [stdout]   --> src/pattern_match/ref.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn and_mut(input: Option<&mut Foo>) -> Option<Foo> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/pointer/cell.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T> Cell<T> {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 12 |     pub fn new(value: T) -> Cell<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/pointer/rc.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<T> Rc<T> {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 17 |     fn new(value: T) -> Rc<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Shared` and `Exclusive` are never constructed
[INFO] [stdout]   --> src/pointer/refcell.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | enum RefState {
[INFO] [stdout]    |      -------- variants in this enum
[INFO] [stdout] 10 |     Unshared,
[INFO] [stdout] 11 |     Shared(usize),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 12 |     Exclusive,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RefState` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `borrow`, and `borrow_mut` are never used
[INFO] [stdout]   --> src/pointer/refcell.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<T> RefCell<T> {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 21 |     fn new(value: T) -> RefCell<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn borrow(&self) -> Option<Ref<T>>
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn borrow_mut(&self) -> Option<RefMut<T>>
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `send` is never used
[INFO] [stdout]   --> src/sync/mpsc.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl<T> Sender<T> {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 30 |     fn send(&self, v: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Receiver` is never constructed
[INFO] [stdout]   --> src/sync/mpsc.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 | struct Receiver<T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `recv` is never used
[INFO] [stdout]   --> src/sync/mpsc.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 71 | impl<T> Receiver<T> {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 72 |     fn recv(&mut self) -> Option<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `queue` is never read
[INFO] [stdout]   --> src/sync/mpsc.rs:96:5
[INFO] [stdout]    |
[INFO] [stdout] 95 | struct Inner<T> {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 96 |     queue: VecDeque<T>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `channel` is never used
[INFO] [stdout]    --> src/sync/mpsc.rs:105:4
[INFO] [stdout]     |
[INFO] [stdout] 105 | fn channel<T>() -> (Sender<T>, Receiver<T>) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `data` and `sender` are never read
[INFO] [stdout]   --> src/tokio/actor.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct ActorMessage<Request, Reply> {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 12 |     data: Request,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 13 |     sender: oneshot::Sender<Reply>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spawn` is never used
[INFO] [stdout]   --> src/tokio/actor.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn spawn<A: Actor>(mut actor: A, mailbox: usize) -> Pid<A::Request, A::Reply>
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `sender` is never read
[INFO] [stdout]   --> src/tokio/actor.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub struct Pid<Request, Reply> {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 37 |     sender: mpsc::Sender<ActorMessage<Request, Reply>>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Pid` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `send` is never used
[INFO] [stdout]   --> src/tokio/actor.rs:41:18
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl<Request, Reply> Pid<Request, Reply> {
[INFO] [stdout]    | ---------------------------------------- method in this implementation
[INFO] [stdout] 41 |     pub async fn send(&self, data: Request) -> Result<Reply> {
[INFO] [stdout]    |                  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `watch` is never used
[INFO] [stdout]  --> src/tokio/watch.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | async fn watch() -> Result<()> {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/pointer/rc.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             drop(inner);
[INFO] [stdout]    |             ^^^^^-----^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  argument has type `&RcInner<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> src/pointer/rc.rs:76:26
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { Box::from_raw(self.inner.as_ptr()) };
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { let _ = Box::from_raw(self.inner.as_ptr()); };
[INFO] [stdout]    |                          +++++++                                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.31s
[INFO] running `Command { std: "docker" "inspect" "6cc07566c960863bc13b6659d8693f9698021fb7d8bff74f4f15285a01aa0766", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cc07566c960863bc13b6659d8693f9698021fb7d8bff74f4f15285a01aa0766", kill_on_drop: false }`
[INFO] [stdout] 6cc07566c960863bc13b6659d8693f9698021fb7d8bff74f4f15285a01aa0766
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 45cf3a2d60060142b3c74473e0ad7d3049a73f4dd5e6c2c6418b9834cb970934
[INFO] running `Command { std: "docker" "start" "-a" "45cf3a2d60060142b3c74473e0ad7d3049a73f4dd5e6c2c6418b9834cb970934", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/pointer/rc.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             drop(inner);
[INFO] [stdout]    |             ^^^^^-----^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  argument has type `&RcInner<T>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> src/pointer/rc.rs:76:26
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { Box::from_raw(self.inner.as_ptr()) };
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 unsafe { let _ = Box::from_raw(self.inner.as_ptr()); };
[INFO] [stdout]    |                          +++++++                                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.75s
[INFO] running `Command { std: "docker" "inspect" "45cf3a2d60060142b3c74473e0ad7d3049a73f4dd5e6c2c6418b9834cb970934", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45cf3a2d60060142b3c74473e0ad7d3049a73f4dd5e6c2c6418b9834cb970934", kill_on_drop: false }`
[INFO] [stdout] 45cf3a2d60060142b3c74473e0ad7d3049a73f4dd5e6c2c6418b9834cb970934
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 618a300392147083627dd6688c8899fdebf8bda91020c9ea1fdaff6ab541481a
[INFO] running `Command { std: "docker" "start" "-a" "618a300392147083627dd6688c8899fdebf8bda91020c9ea1fdaff6ab541481a", kill_on_drop: false }`
[INFO] [stderr] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stderr]   --> src/pointer/rc.rs:66:13
[INFO] [stderr]    |
[INFO] [stderr] 66 |             drop(inner);
[INFO] [stderr]    |             ^^^^^-----^
[INFO] [stderr]    |                  |
[INFO] [stderr]    |                  argument has type `&RcInner<T>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: use `let _ = ...` to ignore the expression or result
[INFO] [stderr]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stderr]   --> src/pointer/rc.rs:76:26
[INFO] [stderr]    |
[INFO] [stderr] 76 |                 unsafe { Box::from_raw(self.inner.as_ptr()) };
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 76 |                 unsafe { let _ = Box::from_raw(self.inner.as_ptr()); };
[INFO] [stderr]    |                          +++++++                                   +
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-by-example` (bin "rust-by-example" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_by_example-92d6334b116ec80a)
[INFO] [stdout] 
[INFO] [stdout] running 31 tests
[INFO] [stdout] test lifetime::function::tests::test_invalid ... ok
[INFO] [stdout] test lifetime::function::tests::test_partial_mark ... ok
[INFO] [stdout] test lifetime::function::tests::test_valid ... ok
[INFO] [stdout] test lifetime::method::tests::test_other_lifetime ... ok
[INFO] [stdout] test lifetime::method::tests::test_self_lifetime ... ok
[INFO] [stdout] test lifetime::r#struct::tests::test_lifetime ... ok
[INFO] [stdout] test pattern_match::r#ref::it_works ... ok
[INFO] [stderr] tcache_thread_shutdown(): unaligned tcache chunk detected
[INFO] [stdout] test pattern_match::r#ref::it_works2 ... ok
[INFO] [stdout] test pointer::cell::test::works ... ok
[INFO] [stderr] error: test failed, to rerun pass `--bin rust-by-example`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/rust_by_example-92d6334b116ec80a` (signal: 6, SIGABRT: process abort signal)
[INFO] running `Command { std: "docker" "inspect" "618a300392147083627dd6688c8899fdebf8bda91020c9ea1fdaff6ab541481a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "618a300392147083627dd6688c8899fdebf8bda91020c9ea1fdaff6ab541481a", kill_on_drop: false }`
[INFO] [stdout] 618a300392147083627dd6688c8899fdebf8bda91020c9ea1fdaff6ab541481a
