[INFO] fetching crate skill-tree 2.0.0...
[INFO] checking skill-tree-2.0.0 against try#6f8a6450478f69b8510c8976ab6c2a70b3b0e47c for pr-84920
[INFO] extracting crate skill-tree 2.0.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate skill-tree 2.0.0 on toolchain 6f8a6450478f69b8510c8976ab6c2a70b3b0e47c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate skill-tree 2.0.0
[INFO] finished tweaking crates.io crate skill-tree 2.0.0
[INFO] tweaked toml for crates.io crate skill-tree 2.0.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate skill-tree 2.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v1.0.14
[INFO] [stderr]   Downloaded rustversion v1.0.2
[INFO] [stderr]   Downloaded structopt-derive v0.4.4
[INFO] [stderr]   Downloaded toml v0.5.1
[INFO] [stderr]   Downloaded syn v0.15.36
[INFO] [stderr]   Downloaded serde_derive v1.0.92
[INFO] [stderr]   Downloaded proc-macro-error-attr v0.4.9
[INFO] [stderr]   Downloaded proc-macro-error v0.4.9
[INFO] [stderr]   Downloaded structopt v0.3.11
[INFO] [stderr]   Downloaded svg v0.5.12
[INFO] [stderr]   Downloaded fehler-macros v1.0.0-alpha.2
[INFO] [stderr]   Downloaded fehler v1.0.0-alpha.2
[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" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a26d58c207213320e2330983f0226bc7d51ab748cc329e1eccc75473762db167
[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" "a26d58c207213320e2330983f0226bc7d51ab748cc329e1eccc75473762db167", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a26d58c207213320e2330983f0226bc7d51ab748cc329e1eccc75473762db167", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a26d58c207213320e2330983f0226bc7d51ab748cc329e1eccc75473762db167", kill_on_drop: false }`
[INFO] [stdout] a26d58c207213320e2330983f0226bc7d51ab748cc329e1eccc75473762db167
[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" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ed8d72e3d6d534ffbadcb89228ac60fb5215e43071b3dd780dc47b247ddb7df
[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" "9ed8d72e3d6d534ffbadcb89228ac60fb5215e43071b3dd780dc47b247ddb7df", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.36
[INFO] [stderr]    Compiling anyhow v1.0.26
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking htmlescape v0.3.1
[INFO] [stderr]     Checking svg v0.5.12
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]     Checking toml v0.5.1
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]    Compiling rustversion v1.0.2
[INFO] [stderr]    Compiling fehler-macros v1.0.0-alpha.2
[INFO] [stderr]    Compiling proc-macro-error v0.4.9
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.9
[INFO] [stderr]     Checking fehler v1.0.0-alpha.2
[INFO] [stderr]    Compiling structopt-derive v0.4.4
[INFO] [stderr]     Checking structopt v0.3.11
[INFO] [stderr]     Checking skill-tree v2.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 56.46s
[INFO] running `Command { std: "docker" "inspect" "9ed8d72e3d6d534ffbadcb89228ac60fb5215e43071b3dd780dc47b247ddb7df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ed8d72e3d6d534ffbadcb89228ac60fb5215e43071b3dd780dc47b247ddb7df", kill_on_drop: false }`
[INFO] [stdout] 9ed8d72e3d6d534ffbadcb89228ac60fb5215e43071b3dd780dc47b247ddb7df