[INFO] cloning repository https://github.com/umurgdk/soundlines
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/umurgdk/soundlines" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fumurgdk%2Fsoundlines", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fumurgdk%2Fsoundlines'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6bbd84705f543bd07366b7839e15954db07fd13e
[INFO] testing umurgdk/soundlines against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fumurgdk%2Fsoundlines" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/umurgdk/soundlines 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/umurgdk/soundlines
[INFO] finished tweaking git repo https://github.com/umurgdk/soundlines
[INFO] tweaked toml for git repo https://github.com/umurgdk/soundlines written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/umurgdk/soundlines 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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] b8014a0e5a9cdd3ca37bf60acdf007c56a79ce16eeef85571898fa6cf3384d4b
[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" "b8014a0e5a9cdd3ca37bf60acdf007c56a79ce16eeef85571898fa6cf3384d4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b8014a0e5a9cdd3ca37bf60acdf007c56a79ce16eeef85571898fa6cf3384d4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8014a0e5a9cdd3ca37bf60acdf007c56a79ce16eeef85571898fa6cf3384d4b", kill_on_drop: false }`
[INFO] [stdout] b8014a0e5a9cdd3ca37bf60acdf007c56a79ce16eeef85571898fa6cf3384d4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] eb31cfdddd7a99e2284243e3539439f9447675706c8f9871abf7d6995fccff26
[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" "eb31cfdddd7a99e2284243e3539439f9447675706c8f9871abf7d6995fccff26", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.31
[INFO] [stderr]    Compiling num-traits v0.1.40
[INFO] [stderr]    Compiling lazy_static v0.2.9
[INFO] [stderr]    Compiling cc v1.0.0
[INFO] [stderr]    Compiling matches v0.1.6
[INFO] [stderr]    Compiling unicode-normalization v0.1.5
[INFO] [stderr]    Compiling serde v1.0.15
[INFO] [stderr]    Compiling byteorder v1.1.0
[INFO] [stderr]    Compiling typenum v1.9.0
[INFO] [stderr]    Compiling odds v0.2.25
[INFO] [stderr]    Compiling log v0.3.8
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling either v1.2.0
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling scopeguard v0.3.2
[INFO] [stderr]    Compiling rayon-core v1.2.1
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling byte-tools v0.2.0
[INFO] [stderr]    Compiling futures v0.1.16
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling dtoa v0.4.2
[INFO] [stderr]    Compiling itoa v0.3.4
[INFO] [stderr]    Compiling rustc-demangle v0.1.5
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling constant_time_eq v0.1.3
[INFO] [stderr]    Compiling percent-encoding v1.0.0
[INFO] [stderr]    Compiling siphasher v0.2.2
[INFO] [stderr]    Compiling utf8-ranges v0.1.3
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling regex-syntax v0.3.9
[INFO] [stderr]    Compiling md5 v0.3.5
[INFO] [stderr]    Compiling httparse v1.2.3
[INFO] [stderr]    Compiling fallible-iterator v0.1.3
[INFO] [stderr]    Compiling gcc v0.3.54
[INFO] [stderr]    Compiling hex v0.2.0
[INFO] [stderr]    Compiling yansi v0.3.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/yansi-0.3.4/src/lib.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature="nightly", feature(const_atomic_bool_new))]
[INFO] [stdout]   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling utf8-ranges v1.0.0
[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 `yansi` 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" "eb31cfdddd7a99e2284243e3539439f9447675706c8f9871abf7d6995fccff26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb31cfdddd7a99e2284243e3539439f9447675706c8f9871abf7d6995fccff26", kill_on_drop: false }`
[INFO] [stdout] eb31cfdddd7a99e2284243e3539439f9447675706c8f9871abf7d6995fccff26