[INFO] fetching crate isolate 0.1.2...
[INFO] checking isolate-0.1.2 against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] extracting crate isolate 0.1.2 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate isolate 0.1.2 on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate isolate 0.1.2
[INFO] finished tweaking crates.io crate isolate 0.1.2
[INFO] tweaked toml for crates.io crate isolate 0.1.2 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unshare v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d1eb077ff5e0b915e2a96a99eaa4ad371332dd4926c644df5e70f29df897f84e
[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" "d1eb077ff5e0b915e2a96a99eaa4ad371332dd4926c644df5e70f29df897f84e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d1eb077ff5e0b915e2a96a99eaa4ad371332dd4926c644df5e70f29df897f84e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1eb077ff5e0b915e2a96a99eaa4ad371332dd4926c644df5e70f29df897f84e", kill_on_drop: false }`
[INFO] [stdout] d1eb077ff5e0b915e2a96a99eaa4ad371332dd4926c644df5e70f29df897f84e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa5c4b038e90b220c2170660655a43f409364da10d0ff3c89c35a15d469bd93a
[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" "fa5c4b038e90b220c2170660655a43f409364da10d0ff3c89c35a15d469bd93a", kill_on_drop: false }`
[INFO] [stderr]     Checking ucd-util v0.1.8
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking bitflags v0.9.1
[INFO] [stderr]     Checking utf8-ranges v1.0.4
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking nix v0.9.0
[INFO] [stderr]     Checking unshare v0.2.0
[INFO] [stderr]     Checking docopt v0.8.3
[INFO] [stderr]     Checking isolate v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `config`
[INFO] [stdout]    --> src/main.rs:144:5
[INFO] [stdout]     |
[INFO] [stdout] 144 |     config: Configuration,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `config`
[INFO] [stdout]    --> src/main.rs:144:5
[INFO] [stdout]     |
[INFO] [stdout] 144 |     config: Configuration,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.25s
[INFO] running `Command { std: "docker" "inspect" "fa5c4b038e90b220c2170660655a43f409364da10d0ff3c89c35a15d469bd93a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa5c4b038e90b220c2170660655a43f409364da10d0ff3c89c35a15d469bd93a", kill_on_drop: false }`
[INFO] [stdout] fa5c4b038e90b220c2170660655a43f409364da10d0ff3c89c35a15d469bd93a