[INFO] fetching crate leetcode_test 0.1.2...
[INFO] testing leetcode_test-0.1.2 against 1.54.0 for beta-1.55-1
[INFO] extracting crate leetcode_test 0.1.2 into /workspace/builds/worker-97/source
[INFO] validating manifest of crates.io crate leetcode_test 0.1.2 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-97/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8104376cba6665a252dbeb92599dd3525b8ca3cd6aa571a75e621618791f9be9
[INFO] running `Command { std: "docker" "start" "-a" "8104376cba6665a252dbeb92599dd3525b8ca3cd6aa571a75e621618791f9be9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8104376cba6665a252dbeb92599dd3525b8ca3cd6aa571a75e621618791f9be9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8104376cba6665a252dbeb92599dd3525b8ca3cd6aa571a75e621618791f9be9", kill_on_drop: false }`
[INFO] [stdout] 8104376cba6665a252dbeb92599dd3525b8ca3cd6aa571a75e621618791f9be9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 163b3c948831f1fb6f50be9b4eb06f416042bd705e3a98f7ecda3c164d054b4b
[INFO] running `Command { std: "docker" "start" "-a" "163b3c948831f1fb6f50be9b4eb06f416042bd705e3a98f7ecda3c164d054b4b", kill_on_drop: false }`
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling leetcode_test v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.92s
[INFO] running `Command { std: "docker" "inspect" "163b3c948831f1fb6f50be9b4eb06f416042bd705e3a98f7ecda3c164d054b4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "163b3c948831f1fb6f50be9b4eb06f416042bd705e3a98f7ecda3c164d054b4b", kill_on_drop: false }`
[INFO] [stdout] 163b3c948831f1fb6f50be9b4eb06f416042bd705e3a98f7ecda3c164d054b4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-97/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 806faa182f66975eae14ae9cd61bfdf832377149a55c04119ee349f133f5fd30
[INFO] running `Command { std: "docker" "start" "-a" "806faa182f66975eae14ae9cd61bfdf832377149a55c04119ee349f133f5fd30", 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`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "806faa182f66975eae14ae9cd61bfdf832377149a55c04119ee349f133f5fd30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "806faa182f66975eae14ae9cd61bfdf832377149a55c04119ee349f133f5fd30", kill_on_drop: false }`
[INFO] [stdout] 806faa182f66975eae14ae9cd61bfdf832377149a55c04119ee349f133f5fd30
