[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 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftony612%2Frust-by-example" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tony612/rust-by-example on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-11/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: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 66e164c2988a5385635b66fd238d3b19da9395ef8f645954eb6469c7577b8221
[INFO] running `Command { std: "docker" "start" "-a" "66e164c2988a5385635b66fd238d3b19da9395ef8f645954eb6469c7577b8221", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "66e164c2988a5385635b66fd238d3b19da9395ef8f645954eb6469c7577b8221", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66e164c2988a5385635b66fd238d3b19da9395ef8f645954eb6469c7577b8221", kill_on_drop: false }`
[INFO] [stdout] 66e164c2988a5385635b66fd238d3b19da9395ef8f645954eb6469c7577b8221
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a82a24eeb6b213131e1e0b0a69b9796d87af9738f37adad09c0a82473b51a602
[INFO] running `Command { std: "docker" "start" "-a" "a82a24eeb6b213131e1e0b0a69b9796d87af9738f37adad09c0a82473b51a602", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling tokio v1.6.1
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling mio v0.7.11
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[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 is never used: `longest`
[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 is never used: `pick_first`
[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 is never constructed: `MyStruct`
[INFO] [stdout]  --> src/lifetime/method.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct MyStruct {}
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]  --> src/lifetime/method.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn empty(&self, _msg: &str) -> &str {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `msg`
[INFO] [stdout]  --> src/lifetime/method.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn msg<'a>(&self, msg: &'a str) -> &'a str {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MyStruct`
[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: associated function is never used: `empty`
[INFO] [stdout]  --> src/lifetime/struct.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn empty(&self, _msg: &str) -> &str {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `msg`
[INFO] [stdout]   --> src/lifetime/struct.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn msg<'b>(&self, msg: &'b str) -> &'b str {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hygiene`
[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 is never used: `across_scope`
[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 is never used: `ref_mut`
[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 is never used: `ref_mut2`
[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 is never used: `ref_mut3`
[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 is never used: `and_mut`
[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 is never used: `new`
[INFO] [stdout]   --> src/pointer/cell.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(value: T) -> Cell<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/pointer/rc.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn new(value: T) -> Rc<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Shared`
[INFO] [stdout]   --> src/pointer/refcell.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Shared(usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Exclusive`
[INFO] [stdout]   --> src/pointer/refcell.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Exclusive,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/pointer/refcell.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn new(value: T) -> RefCell<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `borrow`
[INFO] [stdout]   --> src/pointer/refcell.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn borrow(&self) -> Option<Ref<T>>
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `borrow_mut`
[INFO] [stdout]   --> src/pointer/refcell.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 |     fn borrow_mut(&self) -> Option<RefMut<T>>
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `send`
[INFO] [stdout]   --> src/sync/mpsc.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn send(&self, v: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Receiver`
[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: associated function is never used: `recv`
[INFO] [stdout]   --> src/sync/mpsc.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn recv(&mut self) -> Option<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `queue`
[INFO] [stdout]   --> src/sync/mpsc.rs:96:5
[INFO] [stdout]    |
[INFO] [stdout] 96 |     queue: VecDeque<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `channel`
[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: field is never read: `data`
[INFO] [stdout]   --> src/tokio/actor.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     data: Request,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sender`
[INFO] [stdout]   --> src/tokio/actor.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     sender: oneshot::Sender<Reply>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `spawn`
[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: associated function is never used: `send`
[INFO] [stdout]   --> src/tokio/actor.rs:41:18
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub async fn send(&self, data: Request) -> Result<Reply> {
[INFO] [stdout]    |                  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `watch`
[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: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.96s
[INFO] running `Command { std: "docker" "inspect" "a82a24eeb6b213131e1e0b0a69b9796d87af9738f37adad09c0a82473b51a602", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a82a24eeb6b213131e1e0b0a69b9796d87af9738f37adad09c0a82473b51a602", kill_on_drop: false }`
[INFO] [stdout] a82a24eeb6b213131e1e0b0a69b9796d87af9738f37adad09c0a82473b51a602
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dd541a577ae4257234b7ad15c7fc280094a05aa4f64927fdee519773689458dc
[INFO] running `Command { std: "docker" "start" "-a" "dd541a577ae4257234b7ad15c7fc280094a05aa4f64927fdee519773689458dc", 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]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.33s
[INFO] running `Command { std: "docker" "inspect" "dd541a577ae4257234b7ad15c7fc280094a05aa4f64927fdee519773689458dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd541a577ae4257234b7ad15c7fc280094a05aa4f64927fdee519773689458dc", kill_on_drop: false }`
[INFO] [stdout] dd541a577ae4257234b7ad15c7fc280094a05aa4f64927fdee519773689458dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d014bca27db9c6f77692457dc6378e2046230857a49a2150e690d36a109e316c
[INFO] running `Command { std: "docker" "start" "-a" "d014bca27db9c6f77692457dc6378e2046230857a49a2150e690d36a109e316c", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stdout] running 31 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_by_example-3ddf306f0e0e4d2e)
[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-3ddf306f0e0e4d2e` (signal: 11, SIGSEGV: invalid memory reference)
[INFO] running `Command { std: "docker" "inspect" "d014bca27db9c6f77692457dc6378e2046230857a49a2150e690d36a109e316c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d014bca27db9c6f77692457dc6378e2046230857a49a2150e690d36a109e316c", kill_on_drop: false }`
[INFO] [stdout] d014bca27db9c6f77692457dc6378e2046230857a49a2150e690d36a109e316c
