[INFO] cloning repository https://github.com/thebargaintenor/green-threads
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thebargaintenor/green-threads" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthebargaintenor%2Fgreen-threads", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthebargaintenor%2Fgreen-threads'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a41091c41f8b9b10e86f77441f0b5faf8786a95d
[INFO] testing thebargaintenor/green-threads against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthebargaintenor%2Fgreen-threads" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/thebargaintenor/green-threads 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/thebargaintenor/green-threads
[INFO] finished tweaking git repo https://github.com/thebargaintenor/green-threads
[INFO] tweaked toml for git repo https://github.com/thebargaintenor/green-threads written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/thebargaintenor/green-threads already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0ddd983d601c5c4f341168917477b2417917b4f0d4c005781bd121ff8e097422
[INFO] running `Command { std: "docker" "start" "-a" "0ddd983d601c5c4f341168917477b2417917b4f0d4c005781bd121ff8e097422", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ddd983d601c5c4f341168917477b2417917b4f0d4c005781bd121ff8e097422", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ddd983d601c5c4f341168917477b2417917b4f0d4c005781bd121ff8e097422", kill_on_drop: false }`
[INFO] [stdout] 0ddd983d601c5c4f341168917477b2417917b4f0d4c005781bd121ff8e097422
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a992526ff42a99ef24252cac8ec65007598e024cf104cd095957ca386011a325
[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" "a992526ff42a99ef24252cac8ec65007598e024cf104cd095957ca386011a325", kill_on_drop: false }`
[INFO] [stderr]    Compiling green-threads v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(asm)]
[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 `green-threads` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "a992526ff42a99ef24252cac8ec65007598e024cf104cd095957ca386011a325", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a992526ff42a99ef24252cac8ec65007598e024cf104cd095957ca386011a325", kill_on_drop: false }`
[INFO] [stdout] a992526ff42a99ef24252cac8ec65007598e024cf104cd095957ca386011a325