[INFO] cloning repository https://github.com/ppzxc/rust-learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ppzxc/rust-learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fppzxc%2Frust-learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fppzxc%2Frust-learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d4ca4c5636c1e4bacb8944063db72346295ab419
[INFO] checking ppzxc/rust-learning against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fppzxc%2Frust-learning" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ppzxc/rust-learning on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ppzxc/rust-learning
[INFO] finished tweaking git repo https://github.com/ppzxc/rust-learning
[INFO] tweaked toml for git repo https://github.com/ppzxc/rust-learning written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/ppzxc/rust-learning already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 38db022fa699e6c6ff8ab562dd004af608c745b77ad0df54cc5a64dcdf92bc57
[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" "38db022fa699e6c6ff8ab562dd004af608c745b77ad0df54cc5a64dcdf92bc57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "38db022fa699e6c6ff8ab562dd004af608c745b77ad0df54cc5a64dcdf92bc57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38db022fa699e6c6ff8ab562dd004af608c745b77ad0df54cc5a64dcdf92bc57", kill_on_drop: false }`
[INFO] [stdout] 38db022fa699e6c6ff8ab562dd004af608c745b77ad0df54cc5a64dcdf92bc57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e5bdf16dbaea363f816392fc54ef9eaeb9b974bb268d4b9bb92d8bff7e3eea9f
[INFO] running `Command { std: "docker" "start" "-a" "e5bdf16dbaea363f816392fc54ef9eaeb9b974bb268d4b9bb92d8bff7e3eea9f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking communicator v0.1.0 (/opt/rustwide/workdir/communicator)
[INFO] [stderr]     Checking getrandom v0.2.2
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking rust-learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `example_generic1`
[INFO] [stdout]  --> src/ch18_generic_trait_lifetime.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_generic1() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/ch18_generic_trait_lifetime.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `example_generic2`
[INFO] [stdout]   --> src/ch18_generic_trait_lifetime.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn example_generic2() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `example_generic1`
[INFO] [stdout]  --> src/ch18_generic_trait_lifetime.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_generic1() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/ch18_generic_trait_lifetime.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `example_generic2`
[INFO] [stdout]   --> src/ch18_generic_trait_lifetime.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn example_generic2() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.72s
[INFO] running `Command { std: "docker" "inspect" "e5bdf16dbaea363f816392fc54ef9eaeb9b974bb268d4b9bb92d8bff7e3eea9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5bdf16dbaea363f816392fc54ef9eaeb9b974bb268d4b9bb92d8bff7e3eea9f", kill_on_drop: false }`
[INFO] [stdout] e5bdf16dbaea363f816392fc54ef9eaeb9b974bb268d4b9bb92d8bff7e3eea9f