[INFO] fetching crate moving_gc_arena 0.3.1...
[INFO] checking moving_gc_arena-0.3.1 against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] extracting crate moving_gc_arena 0.3.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate moving_gc_arena 0.3.1 on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate moving_gc_arena 0.3.1
[INFO] finished tweaking crates.io crate moving_gc_arena 0.3.1
[INFO] tweaked toml for crates.io crate moving_gc_arena 0.3.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate moving_gc_arena 0.3.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c824bdfd78eaa75e3e5707d483dd62fae4759cd5e4e0c7fbd2d142329cb74053
[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" "c824bdfd78eaa75e3e5707d483dd62fae4759cd5e4e0c7fbd2d142329cb74053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c824bdfd78eaa75e3e5707d483dd62fae4759cd5e4e0c7fbd2d142329cb74053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c824bdfd78eaa75e3e5707d483dd62fae4759cd5e4e0c7fbd2d142329cb74053", kill_on_drop: false }`
[INFO] [stdout] c824bdfd78eaa75e3e5707d483dd62fae4759cd5e4e0c7fbd2d142329cb74053
[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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c888be9bee43924403ff331b28b78f6d023c922e80f6d05edf8abad3a808c7b
[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" "0c888be9bee43924403ff331b28b78f6d023c922e80f6d05edf8abad3a808c7b", kill_on_drop: false }`
[INFO] [stderr]     Checking moving_gc_arena v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:772:66
[INFO] [stdout]     |
[INFO] [stdout] 772 |                 let mut handle = |mut s: Entry<LList>| -> Option<(Entry<LList>)> {
[INFO] [stdout]     |                                                                  ^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:634:13
[INFO] [stdout]     |
[INFO] [stdout] 634 |         let mut rt2 = rt1.clone();
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:842:13
[INFO] [stdout]     |
[INFO] [stdout] 842 |         let mut i = 0;
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `Command { std: "docker" "inspect" "0c888be9bee43924403ff331b28b78f6d023c922e80f6d05edf8abad3a808c7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c888be9bee43924403ff331b28b78f6d023c922e80f6d05edf8abad3a808c7b", kill_on_drop: false }`
[INFO] [stdout] 0c888be9bee43924403ff331b28b78f6d023c922e80f6d05edf8abad3a808c7b