[INFO] fetching crate libdeadmock 0.1.6...
[INFO] checking libdeadmock-0.1.6 against beta for pr-78714
[INFO] extracting crate libdeadmock 0.1.6 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate libdeadmock 0.1.6 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", 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-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--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-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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 582a05415ea1a3086465aced37dcf8452cd6950ab911207f17f94a056eb0482d
[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" "582a05415ea1a3086465aced37dcf8452cd6950ab911207f17f94a056eb0482d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "582a05415ea1a3086465aced37dcf8452cd6950ab911207f17f94a056eb0482d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "582a05415ea1a3086465aced37dcf8452cd6950ab911207f17f94a056eb0482d", kill_on_drop: false }`
[INFO] [stdout] 582a05415ea1a3086465aced37dcf8452cd6950ab911207f17f94a056eb0482d
[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=forbid" "-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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--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] f5a042d8224d7b9feaa06f6b722872f1075f9100f87bb482b0c2215b0c0b80f8
[INFO] running `Command { std: "docker" "start" "-a" "f5a042d8224d7b9feaa06f6b722872f1075f9100f87bb482b0c2215b0c0b80f8", kill_on_drop: false }`
[INFO] [stderr]     Checking futures v0.1.30
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]    Compiling event-listener v2.5.1
[INFO] [stderr]     Checking bytes v0.6.0
[INFO] [stderr]     Checking tokio-trace-core v0.1.0
[INFO] [stderr]     Checking futures-channel v0.3.8
[INFO] [stderr]     Checking dirs-sys v0.3.5
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking typed-headers v0.2.0
[INFO] [stderr]     Checking libeither v0.4.0
[INFO] [stderr]     Checking clap v2.33.3
[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 getset v0.1.1
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking tracing-futures v0.2.4
[INFO] [stderr]    Compiling async-mutex v1.4.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking futures-util v0.3.8
[INFO] [stderr]     Checking term v0.6.1
[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`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f5a042d8224d7b9feaa06f6b722872f1075f9100f87bb482b0c2215b0c0b80f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5a042d8224d7b9feaa06f6b722872f1075f9100f87bb482b0c2215b0c0b80f8", kill_on_drop: false }`
[INFO] [stdout] f5a042d8224d7b9feaa06f6b722872f1075f9100f87bb482b0c2215b0c0b80f8