[INFO] fetching crate libdeadmock 0.1.6...
[INFO] documenting libdeadmock-0.1.6 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate libdeadmock 0.1.6 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate libdeadmock 0.1.6 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 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-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cached v0.24.0
[INFO] [stderr]   Downloaded tokio v0.1.19
[INFO] [stderr]   Downloaded libeither v0.4.0
[INFO] [stderr]   Downloaded tokio-async-await v0.1.7
[INFO] [stderr]   Downloaded tomlenv v0.4.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 57b02af489c56e8221367f887dad7ca32ece0f28816956ce8ee444de4980bb11
[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" "57b02af489c56e8221367f887dad7ca32ece0f28816956ce8ee444de4980bb11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57b02af489c56e8221367f887dad7ca32ece0f28816956ce8ee444de4980bb11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57b02af489c56e8221367f887dad7ca32ece0f28816956ce8ee444de4980bb11", kill_on_drop: false }`
[INFO] [stdout] 57b02af489c56e8221367f887dad7ca32ece0f28816956ce8ee444de4980bb11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "RUSTDOCFLAGS=--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" "doc" "--frozen" "--no-deps" "--document-private-items" "--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] ab3c3bb5b91447c0727458fcdb8099663ed28ec4801d362c557f1ca4d7e3a5d9
[INFO] running `Command { std: "docker" "start" "-a" "ab3c3bb5b91447c0727458fcdb8099663ed28ec4801d362c557f1ca4d7e3a5d9", kill_on_drop: false }`
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]    Compiling event-listener v2.5.1
[INFO] [stderr]    Compiling cached_proc_macro_types v0.1.0
[INFO] [stderr]    Compiling slog-async v2.7.0
[INFO] [stderr]     Checking take_mut v0.2.2
[INFO] [stderr]     Checking bytes v0.6.0
[INFO] [stderr]    Compiling tokio v1.9.0
[INFO] [stderr]     Checking tokio-trace-core v0.1.0
[INFO] [stderr]     Checking headers-core v0.2.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking futures-util v0.3.16
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking libeither v0.4.0
[INFO] [stderr]     Checking typed-headers v0.2.0
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking headers v0.3.4
[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] [stderr]    Compiling darling_core v0.10.2
[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] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[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] [stderr] error: could not compile `libeither` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ab3c3bb5b91447c0727458fcdb8099663ed28ec4801d362c557f1ca4d7e3a5d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab3c3bb5b91447c0727458fcdb8099663ed28ec4801d362c557f1ca4d7e3a5d9", kill_on_drop: false }`
[INFO] [stdout] ab3c3bb5b91447c0727458fcdb8099663ed28ec4801d362c557f1ca4d7e3a5d9
