[INFO] cloning repository https://github.com/Aloxaf/leetcode_prelude
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Aloxaf/leetcode_prelude" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAloxaf%2Fleetcode_prelude", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAloxaf%2Fleetcode_prelude'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ffab9e5a6fb780bb89edbd60eb1d9aae0b3115dc
[INFO] checking Aloxaf/leetcode_prelude against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAloxaf%2Fleetcode_prelude" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Aloxaf/leetcode_prelude on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Aloxaf/leetcode_prelude
[INFO] finished tweaking git repo https://github.com/Aloxaf/leetcode_prelude
[INFO] tweaked toml for git repo https://github.com/Aloxaf/leetcode_prelude written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d074066b76fbb7ff80dec1b89d5e5942192f2eab7249e6bf82609435bde80f73
[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" "d074066b76fbb7ff80dec1b89d5e5942192f2eab7249e6bf82609435bde80f73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d074066b76fbb7ff80dec1b89d5e5942192f2eab7249e6bf82609435bde80f73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d074066b76fbb7ff80dec1b89d5e5942192f2eab7249e6bf82609435bde80f73", kill_on_drop: false }`
[INFO] [stdout] d074066b76fbb7ff80dec1b89d5e5942192f2eab7249e6bf82609435bde80f73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 734b77e91d1fa925fbb1b5d7c3c6b65ca9d057e27789ec4083f3f6343477b126
[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" "734b77e91d1fa925fbb1b5d7c3c6b65ca9d057e27789ec4083f3f6343477b126", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking leetcode_test v0.1.1 (/opt/rustwide/workdir/leetcode_test)
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]     Checking leetcode_prelude v0.2.2 (/opt/rustwide/workdir/leetcode_prelude)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> leetcode_test/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] running `Command { std: "docker" "inspect" "734b77e91d1fa925fbb1b5d7c3c6b65ca9d057e27789ec4083f3f6343477b126", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "734b77e91d1fa925fbb1b5d7c3c6b65ca9d057e27789ec4083f3f6343477b126", kill_on_drop: false }`
[INFO] [stdout] 734b77e91d1fa925fbb1b5d7c3c6b65ca9d057e27789ec4083f3f6343477b126