[INFO] fetching crate nb-field-names 0.1.0...
[INFO] checking nb-field-names-0.1.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate nb-field-names 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate nb-field-names 0.1.0
[INFO] finished tweaking crates.io crate nb-field-names 0.1.0
[INFO] tweaked toml for crates.io crate nb-field-names 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate nb-field-names 0.1.0 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4d1bd7ed4927acfe35fecd52fe6027e81d16784110cd08cc96248b6a62d29f76
[INFO] running `Command { std: "docker" "start" "-a" "4d1bd7ed4927acfe35fecd52fe6027e81d16784110cd08cc96248b6a62d29f76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4d1bd7ed4927acfe35fecd52fe6027e81d16784110cd08cc96248b6a62d29f76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d1bd7ed4927acfe35fecd52fe6027e81d16784110cd08cc96248b6a62d29f76", kill_on_drop: false }`
[INFO] [stdout] 4d1bd7ed4927acfe35fecd52fe6027e81d16784110cd08cc96248b6a62d29f76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "RUSTDOCFLAGS=--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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2f7857f0665f6da6666763b15d67f36ce7dc1cf5b6cf4fc3de4a933011575492
[INFO] running `Command { std: "docker" "start" "-a" "2f7857f0665f6da6666763b15d67f36ce7dc1cf5b6cf4fc3de4a933011575492", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-ident v1.0.18
[INFO] [stderr]     Checking proc-macro2 v1.0.95
[INFO] [stderr]     Checking quote v1.0.40
[INFO] [stderr]     Checking syn v2.0.104
[INFO] [stderr]     Checking nb-field-names v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.81s
[INFO] running `Command { std: "docker" "inspect" "2f7857f0665f6da6666763b15d67f36ce7dc1cf5b6cf4fc3de4a933011575492", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f7857f0665f6da6666763b15d67f36ce7dc1cf5b6cf4fc3de4a933011575492", kill_on_drop: false }`
[INFO] [stdout] 2f7857f0665f6da6666763b15d67f36ce7dc1cf5b6cf4fc3de4a933011575492