[INFO] cloning repository https://github.com/VladasZ/tools
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/VladasZ/tools" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVladasZ%2Ftools", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVladasZ%2Ftools'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 77af996b069ada2cef573d75d1881e2ac8e5da9f
[INFO] testing VladasZ/tools against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVladasZ%2Ftools" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/VladasZ/tools on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/VladasZ/tools
[INFO] finished tweaking git repo https://github.com/VladasZ/tools
[INFO] tweaked toml for git repo https://github.com/VladasZ/tools written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/VladasZ/tools already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "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] a88d549598e25a2463effad968a9ae6a530802ebb038d8bb13e081e9a30fe010
[INFO] running `Command { std: "docker" "start" "-a" "a88d549598e25a2463effad968a9ae6a530802ebb038d8bb13e081e9a30fe010", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a88d549598e25a2463effad968a9ae6a530802ebb038d8bb13e081e9a30fe010", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a88d549598e25a2463effad968a9ae6a530802ebb038d8bb13e081e9a30fe010", kill_on_drop: false }`
[INFO] [stdout] a88d549598e25a2463effad968a9ae6a530802ebb038d8bb13e081e9a30fe010
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--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] 264154b3b0c6834270617b55ce02a3f2818dc6442102d21c5dcbe7d161983313
[INFO] running `Command { std: "docker" "start" "-a" "264154b3b0c6834270617b55ce02a3f2818dc6442102d21c5dcbe7d161983313", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_derive v1.0.131
[INFO] [stderr]    Compiling serde v1.0.131
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling dirs v3.0.2
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling tokio v1.15.0
[INFO] [stderr]    Compiling serde_json v1.0.73
[INFO] [stderr]    Compiling rtools v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(specialization)]
[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 `rtools` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "264154b3b0c6834270617b55ce02a3f2818dc6442102d21c5dcbe7d161983313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "264154b3b0c6834270617b55ce02a3f2818dc6442102d21c5dcbe7d161983313", kill_on_drop: false }`
[INFO] [stdout] 264154b3b0c6834270617b55ce02a3f2818dc6442102d21c5dcbe7d161983313