[INFO] fetching crate kakao-rs 0.2.4...
[INFO] testing kakao-rs-0.2.4 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate kakao-rs 0.2.4 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate kakao-rs 0.2.4 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate kakao-rs 0.2.4
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate kakao-rs 0.2.4
[INFO] tweaked toml for crates.io crate kakao-rs 0.2.4 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate kakao-rs 0.2.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eae7cd284af3b3c4b180e734267a8bc57294436c2e7ae5eb440b4276e036354f
[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" "eae7cd284af3b3c4b180e734267a8bc57294436c2e7ae5eb440b4276e036354f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eae7cd284af3b3c4b180e734267a8bc57294436c2e7ae5eb440b4276e036354f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eae7cd284af3b3c4b180e734267a8bc57294436c2e7ae5eb440b4276e036354f", kill_on_drop: false }`
[INFO] [stdout] eae7cd284af3b3c4b180e734267a8bc57294436c2e7ae5eb440b4276e036354f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 48a48fcb20d8155fdca7b0314ccd2642d6006988fd292d6aad9e2896fa4d017d
[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" "48a48fcb20d8155fdca7b0314ccd2642d6006988fd292d6aad9e2896fa4d017d", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.65
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling kakao-rs v0.2.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:41:1
[INFO] [stdout]    |
[INFO] [stdout] 41 | #![feature(proc_macro_hygiene, decl_macro)]
[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 `kakao-rs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "48a48fcb20d8155fdca7b0314ccd2642d6006988fd292d6aad9e2896fa4d017d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48a48fcb20d8155fdca7b0314ccd2642d6006988fd292d6aad9e2896fa4d017d", kill_on_drop: false }`
[INFO] [stdout] 48a48fcb20d8155fdca7b0314ccd2642d6006988fd292d6aad9e2896fa4d017d
