[INFO] fetching crate platter-walk 0.1.3...
[INFO] checking platter-walk-0.1.3 against try#6f8a6450478f69b8510c8976ab6c2a70b3b0e47c for pr-84920
[INFO] extracting crate platter-walk 0.1.3 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate platter-walk 0.1.3 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 platter-walk 0.1.3
[INFO] finished tweaking crates.io crate platter-walk 0.1.3
[INFO] tweaked toml for crates.io crate platter-walk 0.1.3 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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 build_const v0.2.2
[INFO] [stderr]   Downloaded crc v1.8.1
[INFO] [stderr]   Downloaded minilzo v0.1.2
[INFO] [stderr]   Downloaded uuid v0.3.1
[INFO] [stderr]   Downloaded btrfs2 v1.2.2
[INFO] [stderr]   Downloaded flate2 v0.2.20
[INFO] [stderr]   Downloaded mnt v0.3.1
[INFO] [stderr]   Downloaded nix v0.8.1
[INFO] [stderr]   Downloaded minilzo-sys v0.1.0
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ea6d3bdf42201b921d1d6c76efd1589f97beb864e3c874c7c9d77415b8569517
[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" "ea6d3bdf42201b921d1d6c76efd1589f97beb864e3c874c7c9d77415b8569517", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea6d3bdf42201b921d1d6c76efd1589f97beb864e3c874c7c9d77415b8569517", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea6d3bdf42201b921d1d6c76efd1589f97beb864e3c874c7c9d77415b8569517", kill_on_drop: false }`
[INFO] [stdout] ea6d3bdf42201b921d1d6c76efd1589f97beb864e3c874c7c9d77415b8569517
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "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] 11207cda266212b138b3dc757975fe6b2bf3f8870f057372c8395bf0574565c9
[INFO] running `Command { std: "docker" "start" "-a" "11207cda266212b138b3dc757975fe6b2bf3f8870f057372c8395bf0574565c9", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.67
[INFO] [stderr]    Compiling build_const v0.2.2
[INFO] [stderr]     Checking bitflags v0.7.0
[INFO] [stderr]     Checking uuid v0.3.1
[INFO] [stderr]     Checking minilzo-sys v0.1.0
[INFO] [stderr]     Checking mnt v0.3.1
[INFO] [stderr]     Checking nix v0.8.1
[INFO] [stderr]     Checking minilzo v0.1.2
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]     Checking btrfs2 v1.2.2
[INFO] [stderr]     Checking platter-walk v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `prev_fetched`
[INFO] [stdout]    --> src/lib.rs:207:13
[INFO] [stdout]     |
[INFO] [stdout] 207 |         let prev_fetched = self.prefetched.len();
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_fetched`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev_fetched`
[INFO] [stdout]    --> src/lib.rs:207:13
[INFO] [stdout]     |
[INFO] [stdout] 207 |         let prev_fetched = self.prefetched.len();
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_fetched`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` 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 11.23s
[INFO] running `Command { std: "docker" "inspect" "11207cda266212b138b3dc757975fe6b2bf3f8870f057372c8395bf0574565c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11207cda266212b138b3dc757975fe6b2bf3f8870f057372c8395bf0574565c9", kill_on_drop: false }`
[INFO] [stdout] 11207cda266212b138b3dc757975fe6b2bf3f8870f057372c8395bf0574565c9