[INFO] fetching crate leetcode_test 0.1.2...
[INFO] testing leetcode_test-0.1.2 against 1.60.0 for beta-1.61-1
[INFO] extracting crate leetcode_test 0.1.2 into /workspace/builds/worker-115/source
[INFO] validating manifest of crates.io crate leetcode_test 0.1.2 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate leetcode_test 0.1.2
[INFO] finished tweaking crates.io crate leetcode_test 0.1.2
[INFO] tweaked toml for crates.io crate leetcode_test 0.1.2 written to /workspace/builds/worker-115/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 909b293b0526df1dc5b795a336d1a119e29228f15bd280970458c6c06bc4e536
[INFO] running `Command { std: "docker" "start" "-a" "909b293b0526df1dc5b795a336d1a119e29228f15bd280970458c6c06bc4e536", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "909b293b0526df1dc5b795a336d1a119e29228f15bd280970458c6c06bc4e536", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "909b293b0526df1dc5b795a336d1a119e29228f15bd280970458c6c06bc4e536", kill_on_drop: false }`
[INFO] [stdout] 909b293b0526df1dc5b795a336d1a119e29228f15bd280970458c6c06bc4e536
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f3fbfda6c508b39614c8475470d8cdbbef8c08a64814165c3a459ea31e9087d6
[INFO] running `Command { std: "docker" "start" "-a" "f3fbfda6c508b39614c8475470d8cdbbef8c08a64814165c3a459ea31e9087d6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling ryu v1.0.9
[INFO] [stderr]    Compiling itoa v1.0.1
[INFO] [stderr]    Compiling leetcode_test v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 43.52s
[INFO] running `Command { std: "docker" "inspect" "f3fbfda6c508b39614c8475470d8cdbbef8c08a64814165c3a459ea31e9087d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3fbfda6c508b39614c8475470d8cdbbef8c08a64814165c3a459ea31e9087d6", kill_on_drop: false }`
[INFO] [stdout] f3fbfda6c508b39614c8475470d8cdbbef8c08a64814165c3a459ea31e9087d6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1c53875fed54a0fd6f6518880de29c0466b7665afadaf637bdf54778d885d962
[INFO] running `Command { std: "docker" "start" "-a" "1c53875fed54a0fd6f6518880de29c0466b7665afadaf637bdf54778d885d962", kill_on_drop: false }`
[INFO] [stderr]    Compiling leetcode_test v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tests/test.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `leetcode_test` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "1c53875fed54a0fd6f6518880de29c0466b7665afadaf637bdf54778d885d962", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c53875fed54a0fd6f6518880de29c0466b7665afadaf637bdf54778d885d962", kill_on_drop: false }`
[INFO] [stdout] 1c53875fed54a0fd6f6518880de29c0466b7665afadaf637bdf54778d885d962