[INFO] fetching crate libdeadmock 0.1.6...
[INFO] testing libdeadmock-0.1.6 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate libdeadmock 0.1.6 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate libdeadmock 0.1.6 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libdeadmock 0.1.6
[INFO] finished tweaking crates.io crate libdeadmock 0.1.6
[INFO] tweaked toml for crates.io crate libdeadmock 0.1.6 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2021-09-08" "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] 349c03a188443742f9d51db11678f0ee0614c78154f45894655337072fdd9269
[INFO] running `Command { std: "docker" "start" "-a" "349c03a188443742f9d51db11678f0ee0614c78154f45894655337072fdd9269", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "349c03a188443742f9d51db11678f0ee0614c78154f45894655337072fdd9269", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "349c03a188443742f9d51db11678f0ee0614c78154f45894655337072fdd9269", kill_on_drop: false }`
[INFO] [stdout] 349c03a188443742f9d51db11678f0ee0614c78154f45894655337072fdd9269
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2021-09-08" "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] 1bcb46f55ad9bc04b7234845337a4c77c9177cffea382200dfaae3f49c3e08dc
[INFO] running `Command { std: "docker" "start" "-a" "1bcb46f55ad9bc04b7234845337a4c77c9177cffea382200dfaae3f49c3e08dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures v0.1.31
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]    Compiling cached_proc_macro_types v0.1.0
[INFO] [stderr]    Compiling tokio v1.11.0
[INFO] [stderr]    Compiling tokio-trace-core v0.1.0
[INFO] [stderr]    Compiling futures-channel v0.3.17
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling libeither v0.4.0
[INFO] [stderr]    Compiling headers v0.3.4
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling typed-headers v0.2.0
[INFO] [stderr]    Compiling tomlenv v0.4.1
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libeither-0.4.0/src/lib.rs:63:35
[INFO] [stdout]    |
[INFO] [stdout] 63 | #![cfg_attr(feature = "unstable", feature(error_iter))]
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `iter_sources` found for trait object `dyn StdError` in the current scope
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libeither-0.4.0/src/error.rs:79:38
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let res = std::error::Error::iter_sources(self).fold(
[INFO] [stdout]    |                                      ^^^^^^^^^^^^ function or associated item not found in `dyn StdError`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libeither` due to 3 previous errors
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tomlenv-0.4.1/src/lib.rs:266:1
[INFO] [stdout]     |
[INFO] [stdout] 266 | #![feature(crate_visibility_modifier, error_iter)]
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "1bcb46f55ad9bc04b7234845337a4c77c9177cffea382200dfaae3f49c3e08dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bcb46f55ad9bc04b7234845337a4c77c9177cffea382200dfaae3f49c3e08dc", kill_on_drop: false }`
[INFO] [stdout] 1bcb46f55ad9bc04b7234845337a4c77c9177cffea382200dfaae3f49c3e08dc