[INFO] fetching crate permutator 0.4.0...
[INFO] checking permutator-0.4.0 against try#6f8a6450478f69b8510c8976ab6c2a70b3b0e47c for pr-84920
[INFO] extracting crate permutator 0.4.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate permutator 0.4.0 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 permutator 0.4.0
[INFO] finished tweaking crates.io crate permutator 0.4.0
[INFO] tweaked toml for crates.io crate permutator 0.4.0 written to /workspace/builds/worker-3/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] 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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--no-deps" "--format-version=1", 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] 1ce80eceec2d68ed87e645d83962a7bc63a50bb23b49d9e8ae52b504c07a5c59
[INFO] running `Command { std: "docker" "start" "-a" "1ce80eceec2d68ed87e645d83962a7bc63a50bb23b49d9e8ae52b504c07a5c59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ce80eceec2d68ed87e645d83962a7bc63a50bb23b49d9e8ae52b504c07a5c59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ce80eceec2d68ed87e645d83962a7bc63a50bb23b49d9e8ae52b504c07a5c59", kill_on_drop: false }`
[INFO] [stdout] 1ce80eceec2d68ed87e645d83962a7bc63a50bb23b49d9e8ae52b504c07a5c59
[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=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] dc11246efad105f2e90182db0a6f62e913696e4f846aa1ed953eefcda6a58569
[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" "dc11246efad105f2e90182db0a6f62e913696e4f846aa1ed953eefcda6a58569", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking permutator v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]     --> src/lib.rs:2292:6
[INFO] [stdout]      |
[INFO] [stdout] 2292 |     };
[INFO] [stdout]      |      ^ help: remove this semicolon
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]     --> src/lib.rs:2292:6
[INFO] [stdout]      |
[INFO] [stdout] 2292 |     };
[INFO] [stdout]      |      ^ help: remove this semicolon
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/copy/mod.rs:3047:5
[INFO] [stdout]      |
[INFO] [stdout] 3047 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/copy/mod.rs:3157:5
[INFO] [stdout]      |
[INFO] [stdout] 3157 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/copy/mod.rs:3280:5
[INFO] [stdout]      |
[INFO] [stdout] 3280 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/lib.rs:3747:5
[INFO] [stdout]      |
[INFO] [stdout] 3747 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/lib.rs:3856:5
[INFO] [stdout]      |
[INFO] [stdout] 3856 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/lib.rs:3978:5
[INFO] [stdout]      |
[INFO] [stdout] 3978 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/copy/mod.rs:3047:5
[INFO] [stdout]      |
[INFO] [stdout] 3047 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/copy/mod.rs:3157:5
[INFO] [stdout]      |
[INFO] [stdout] 3157 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/copy/mod.rs:3280:5
[INFO] [stdout]      |
[INFO] [stdout] 3280 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/lib.rs:3747:5
[INFO] [stdout]      |
[INFO] [stdout] 3747 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/lib.rs:3856:5
[INFO] [stdout]      |
[INFO] [stdout] 3856 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `i`
[INFO] [stdout]     --> src/lib.rs:3978:5
[INFO] [stdout]      |
[INFO] [stdout] 3978 |     i : usize, // slot index being mutate.
[INFO] [stdout]      |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.77s
[INFO] running `Command { std: "docker" "inspect" "dc11246efad105f2e90182db0a6f62e913696e4f846aa1ed953eefcda6a58569", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc11246efad105f2e90182db0a6f62e913696e4f846aa1ed953eefcda6a58569", kill_on_drop: false }`
[INFO] [stdout] dc11246efad105f2e90182db0a6f62e913696e4f846aa1ed953eefcda6a58569