[INFO] fetching crate flagset 0.4.2...
[INFO] checking flagset-0.4.2 against 1.55.0 for beta-1.56-3
[INFO] extracting crate flagset 0.4.2 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate flagset 0.4.2 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flagset 0.4.2
[INFO] finished tweaking crates.io crate flagset 0.4.2
[INFO] tweaked toml for crates.io crate flagset 0.4.2 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_repr v0.1.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e08a623ceab329db1fef8cb1423752dcdd1d8d59244e1fe0785a96e27520d31b
[INFO] running `Command { std: "docker" "start" "-a" "e08a623ceab329db1fef8cb1423752dcdd1d8d59244e1fe0785a96e27520d31b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e08a623ceab329db1fef8cb1423752dcdd1d8d59244e1fe0785a96e27520d31b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e08a623ceab329db1fef8cb1423752dcdd1d8d59244e1fe0785a96e27520d31b", kill_on_drop: false }`
[INFO] [stdout] e08a623ceab329db1fef8cb1423752dcdd1d8d59244e1fe0785a96e27520d31b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 02bacab5fe675d86e120c1e380840091c82db5e897443347a1a8e5b212d48fda
[INFO] running `Command { std: "docker" "start" "-a" "02bacab5fe675d86e120c1e380840091c82db5e897443347a1a8e5b212d48fda", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking flagset v0.4.2 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]    Compiling serde_repr v0.1.7
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.63s
[INFO] running `Command { std: "docker" "inspect" "02bacab5fe675d86e120c1e380840091c82db5e897443347a1a8e5b212d48fda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "02bacab5fe675d86e120c1e380840091c82db5e897443347a1a8e5b212d48fda", kill_on_drop: false }`
[INFO] [stdout] 02bacab5fe675d86e120c1e380840091c82db5e897443347a1a8e5b212d48fda
