[INFO] cloning repository https://github.com/denoland/serde_v8
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/denoland/serde_v8" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdenoland%2Fserde_v8", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdenoland%2Fserde_v8'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b1ef191881dbfd2f85483aa35245005483a3b8cd
[INFO] checking denoland/serde_v8 against master#0a8629bff642c3c3b84bb644c0099194f063b627 for pr-86231
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdenoland%2Fserde_v8" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/denoland/serde_v8 on toolchain 0a8629bff642c3c3b84bb644c0099194f063b627
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/denoland/serde_v8
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/denoland/serde_v8
[INFO] tweaked toml for git repo https://github.com/denoland/serde_v8 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/denoland/serde_v8 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+0a8629bff642c3c3b84bb644c0099194f063b627" "metadata" "--no-deps" "--format-version=1", 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] 89f47a5599c4796a40c0f9cf70a5570a2c6ecf32cfb4aca68e3c2933c4ac89a2
[INFO] running `Command { std: "docker" "start" "-a" "89f47a5599c4796a40c0f9cf70a5570a2c6ecf32cfb4aca68e3c2933c4ac89a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "89f47a5599c4796a40c0f9cf70a5570a2c6ecf32cfb4aca68e3c2933c4ac89a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89f47a5599c4796a40c0f9cf70a5570a2c6ecf32cfb4aca68e3c2933c4ac89a2", kill_on_drop: false }`
[INFO] [stdout] 89f47a5599c4796a40c0f9cf70a5570a2c6ecf32cfb4aca68e3c2933c4ac89a2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+0a8629bff642c3c3b84bb644c0099194f063b627" "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] 39f88dcea91d20abf94cbeeb3a444977db17879a5c65eadf05803e0946111a11
[INFO] running `Command { std: "docker" "start" "-a" "39f88dcea91d20abf94cbeeb3a444977db17879a5c65eadf05803e0946111a11", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling fslock v0.1.6
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling which v4.1.0
[INFO] [stderr]    Compiling rusty_v8 v0.22.3
[INFO] [stderr]     Checking serde_v8 v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `a`
[INFO] [stdout]   --> tests/magic.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 |   pub a: u64,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `b`
[INFO] [stdout]   --> tests/magic.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout] 12 |   pub b: u64,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `operator`
[INFO] [stdout]   --> tests/magic.rs:14:3
[INFO] [stdout]    |
[INFO] [stdout] 14 |   pub operator: Option<String>,
[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 17.57s
[INFO] running `Command { std: "docker" "inspect" "39f88dcea91d20abf94cbeeb3a444977db17879a5c65eadf05803e0946111a11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39f88dcea91d20abf94cbeeb3a444977db17879a5c65eadf05803e0946111a11", kill_on_drop: false }`
[INFO] [stdout] 39f88dcea91d20abf94cbeeb3a444977db17879a5c65eadf05803e0946111a11