[INFO] fetching crate cursed-collections 0.6.2...
[INFO] checking cursed-collections-0.6.2 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate cursed-collections 0.6.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate cursed-collections 0.6.2 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cursed-collections 0.6.2
[INFO] finished tweaking crates.io crate cursed-collections 0.6.2
[INFO] tweaked toml for crates.io crate cursed-collections 0.6.2 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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] bac2458c8732560000d6b46153e2f354bbaf92343a01e85907767f5370a028f5
[INFO] running `Command { std: "docker" "start" "-a" "bac2458c8732560000d6b46153e2f354bbaf92343a01e85907767f5370a028f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bac2458c8732560000d6b46153e2f354bbaf92343a01e85907767f5370a028f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bac2458c8732560000d6b46153e2f354bbaf92343a01e85907767f5370a028f5", kill_on_drop: false }`
[INFO] [stdout] bac2458c8732560000d6b46153e2f354bbaf92343a01e85907767f5370a028f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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] 0d67e65ba2ab63d6b1aa650ae02d7ccfcb4ff4b782acd7dcf1f68a583d10f760
[INFO] running `Command { std: "docker" "start" "-a" "0d67e65ba2ab63d6b1aa650ae02d7ccfcb4ff4b782acd7dcf1f68a583d10f760", kill_on_drop: false }`
[INFO] [stderr]     Checking cursed-collections v0.6.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/append_only_vec.rs:217:9
[INFO] [stdout]     |
[INFO] [stdout] 217 |         &vec[2];
[INFO] [stdout]     |         ^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 217 |         let _ = &vec[2];
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "0d67e65ba2ab63d6b1aa650ae02d7ccfcb4ff4b782acd7dcf1f68a583d10f760", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d67e65ba2ab63d6b1aa650ae02d7ccfcb4ff4b782acd7dcf1f68a583d10f760", kill_on_drop: false }`
[INFO] [stdout] 0d67e65ba2ab63d6b1aa650ae02d7ccfcb4ff4b782acd7dcf1f68a583d10f760