[INFO] fetching crate rust-rocket 0.3.5...
[INFO] checking rust-rocket-0.3.5 against try#575650af7d7ca88602df28e39d27bf3e456c306e for pr-80579
[INFO] extracting crate rust-rocket 0.3.5 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate rust-rocket 0.3.5 on toolchain 575650af7d7ca88602df28e39d27bf3e456c306e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rust-rocket 0.3.5
[INFO] finished tweaking crates.io crate rust-rocket 0.3.5
[INFO] tweaked toml for crates.io crate rust-rocket 0.3.5 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f0f028aa9c3d80ef6f8c314a05d8847a7af05ceb8c2bd6454b1160f4f255c786
[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" "f0f028aa9c3d80ef6f8c314a05d8847a7af05ceb8c2bd6454b1160f4f255c786", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f0f028aa9c3d80ef6f8c314a05d8847a7af05ceb8c2bd6454b1160f4f255c786", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0f028aa9c3d80ef6f8c314a05d8847a7af05ceb8c2bd6454b1160f4f255c786", kill_on_drop: false }`
[INFO] [stdout] f0f028aa9c3d80ef6f8c314a05d8847a7af05ceb8c2bd6454b1160f4f255c786
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d7a0aa8de2537694f41d8c04939547737d14ce5e555bc3088b3cce5f9e03164d
[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" "d7a0aa8de2537694f41d8c04939547737d14ce5e555bc3088b3cce5f9e03164d", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-rocket v0.3.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/client.rs:232:33
[INFO] [stdout]     |
[INFO] [stdout] 232 | ...                   let mut track =
[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/client.rs:242:33
[INFO] [stdout]     |
[INFO] [stdout] 242 | ...                   let mut track =
[INFO] [stdout]     |                           ----^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/client.rs:232:33
[INFO] [stdout]     |
[INFO] [stdout] 232 | ...                   let mut track =
[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/client.rs:242:33
[INFO] [stdout]     |
[INFO] [stdout] 242 | ...                   let mut track =
[INFO] [stdout]     |                           ----^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `Command { std: "docker" "inspect" "d7a0aa8de2537694f41d8c04939547737d14ce5e555bc3088b3cce5f9e03164d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7a0aa8de2537694f41d8c04939547737d14ce5e555bc3088b3cce5f9e03164d", kill_on_drop: false }`
[INFO] [stdout] d7a0aa8de2537694f41d8c04939547737d14ce5e555bc3088b3cce5f9e03164d