[INFO] cloning repository https://github.com/pjzhong/rust_practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pjzhong/rust_practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpjzhong%2Frust_practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpjzhong%2Frust_practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab6ce2210160a3218fd7638d07d8e484d397f814
[INFO] checking pjzhong/rust_practice against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpjzhong%2Frust_practice" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/pjzhong/rust_practice on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/pjzhong/rust_practice
[INFO] finished tweaking git repo https://github.com/pjzhong/rust_practice
[INFO] tweaked toml for git repo https://github.com/pjzhong/rust_practice written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/pjzhong/rust_practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded vk-sys v0.6.0
[INFO] [stderr]   Downloaded vulkano-win v0.21.0
[INFO] [stderr]   Downloaded vulkano v0.21.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1b006168ad97d7e164e65fd3dc43c6c312b336d56996622ffe1e427eb0562b1e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1b006168ad97d7e164e65fd3dc43c6c312b336d56996622ffe1e427eb0562b1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1b006168ad97d7e164e65fd3dc43c6c312b336d56996622ffe1e427eb0562b1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b006168ad97d7e164e65fd3dc43c6c312b336d56996622ffe1e427eb0562b1e", kill_on_drop: false }`
[INFO] [stdout] 1b006168ad97d7e164e65fd3dc43c6c312b336d56996622ffe1e427eb0562b1e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c21408ed0a034a09c709a7e431ca84c4886cc0c5e2978380bccaaa740964f39a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c21408ed0a034a09c709a7e431ca84c4886cc0c5e2978380bccaaa740964f39a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.91
[INFO] [stderr]    Compiling xml-rs v0.8.3
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking xdg v2.2.0
[INFO] [stderr]    Compiling vulkano v0.21.0
[INFO] [stderr]    Compiling syn v1.0.67
[INFO] [stderr]     Checking vk-sys v0.6.0
[INFO] [stderr]     Checking algorithms v0.1.0 (/opt/rustwide/workdir/algorithms)
[INFO] [stderr]     Checking learn v0.1.0 (/opt/rustwide/workdir/learn)
[INFO] [stderr]     Checking rust_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> learn/src/esc/mod.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]     Checking libloading v0.7.0
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> learn/src/chapter20/web_server.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `handle_connection`
[INFO] [stdout]   --> learn/src/chapter20/web_server.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn handle_connection(mut stream: TcpStream) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `write`
[INFO] [stdout]   --> learn/src/chapter20/web_server.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn write(stream: &mut TcpStream, response: String) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `NewJob`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     NewJob(Job),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Worker {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn new(size: usize) -> ThreadPool {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `execute`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:61:12
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn execute<F>(&self, f: F)
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> learn/src/chapter20/web_server.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `handle_connection`
[INFO] [stdout]   --> learn/src/chapter20/web_server.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn handle_connection(mut stream: TcpStream) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `write`
[INFO] [stdout]   --> learn/src/chapter20/web_server.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn write(stream: &mut TcpStream, response: String) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `NewJob`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     NewJob(Job),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Worker {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn new(size: usize) -> ThreadPool {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `execute`
[INFO] [stdout]   --> learn/src/chapter20/thread_pool.rs:61:12
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn execute<F>(&self, f: F)
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `World`
[INFO] [stdout]  --> learn/src/esc/mod.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct World {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> learn/src/esc/mod.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_entity`
[INFO] [stdout]   --> learn/src/esc/mod.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn new_entity(&mut self) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_component_to_entity`
[INFO] [stdout]   --> learn/src/esc/mod.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 |     fn add_component_to_entity<ComponentType: 'static>(
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `borrow_component_vec`
[INFO] [stdout]   --> learn/src/esc/mod.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn borrow_component_vec<ComponentType: 'static>(&self) -> Option<&Vec<Option<ComponentType>>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Heath`
[INFO] [stdout]   --> learn/src/esc/mod.rs:88:12
[INFO] [stdout]    |
[INFO] [stdout] 88 |     struct Heath(i32);
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Name`
[INFO] [stdout]   --> learn/src/esc/mod.rs:89:12
[INFO] [stdout]    |
[INFO] [stdout] 89 |     struct Name(String);
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `No`
[INFO] [stdout]   --> learn/src/esc/mod.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |     struct No(Option<String>);
[INFO] [stdout]    |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling wayland-sys v0.28.5
[INFO] [stderr]    Compiling nom v6.1.2
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking lock_api v0.4.3
[INFO] [stderr]     Checking libloading v0.6.7
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]     Checking deflate v0.8.6
[INFO] [stderr]     Checking gif v0.11.2
[INFO] [stderr]     Checking log v0.4.14
[INFO] [stderr]     Checking dlib v0.5.0
[INFO] [stderr]     Checking dlib v0.4.2
[INFO] [stderr]     Checking crossbeam-channel v0.5.0
[INFO] [stderr]     Checking crossbeam-queue v0.3.1
[INFO] [stderr]    Compiling shaderc-sys v0.6.3
[INFO] [stderr]     Checking andrew v0.3.1
[INFO] [stderr]    Compiling wayland-scanner v0.28.5
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking crossbeam v0.8.0
[INFO] [stderr]    Compiling wayland-client v0.28.5
[INFO] [stderr]    Compiling wayland-protocols v0.28.5
[INFO] [stderr]     Checking nix v0.20.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking nix v0.18.0
[INFO] [stderr]     Checking net2 v0.2.37
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking memmap2 v0.1.0
[INFO] [stderr]     Checking x11-dl v2.18.5
[INFO] [stderr]     Checking raw-window-handle v0.3.3
[INFO] [stderr]     Checking shared_library v0.1.9
[INFO] [stderr]     Checking rayon-core v1.9.0
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking xcursor v0.3.3
[INFO] [stderr]     Checking rayon v1.5.0
[INFO] [stderr] error: could not compile `nix`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name nix --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/nix-0.20.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 -C metadata=78e2638458edbbba -C extra-filename=-78e2638458edbbba --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-240d294e8e0ea2cd.rmeta --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-4967f2c063bf2af6.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-66e5682dfeb5a7a3.rmeta --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] The following warnings were emitted during compilation:
[INFO] [stderr] 
[INFO] [stderr] warning: Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr] warning: System installed library not found.  Falling back to build from source
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c21408ed0a034a09c709a7e431ca84c4886cc0c5e2978380bccaaa740964f39a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c21408ed0a034a09c709a7e431ca84c4886cc0c5e2978380bccaaa740964f39a", kill_on_drop: false }`
[INFO] [stdout] c21408ed0a034a09c709a7e431ca84c4886cc0c5e2978380bccaaa740964f39a