[INFO] fetching crate libp3p 0.0.0...
[INFO] testing libp3p-0.0.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate libp3p 0.0.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate libp3p 0.0.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libp3p 0.0.0
[INFO] finished tweaking crates.io crate libp3p 0.0.0
[INFO] tweaked toml for crates.io crate libp3p 0.0.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crunchy v0.2.2
[INFO] [stderr]   Downloaded static_assertions v1.1.0
[INFO] [stderr]   Downloaded const_fn v0.4.4
[INFO] [stderr]   Downloaded fixedbitset v0.2.0
[INFO] [stderr]   Downloaded parking_lot_core v0.7.2
[INFO] [stderr]   Downloaded parking_lot v0.10.2
[INFO] [stderr]   Downloaded curve25519-dalek v2.1.0
[INFO] [stderr]   Downloaded petgraph v0.5.1
[INFO] [stderr]   Downloaded async-std v0.99.12
[INFO] [stderr]   Downloaded async-macros v1.0.0
[INFO] [stderr]   Downloaded async-task v1.3.1
[INFO] [stderr]   Downloaded futures-core v0.3.8
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]   Downloaded futures-timer v1.0.3
[INFO] [stderr]   Downloaded crossbeam-utils v0.6.6
[INFO] [stderr]   Downloaded rand_xorshift v0.1.1
[INFO] [stderr]   Downloaded crossbeam-channel v0.4.4
[INFO] [stderr]   Downloaded futures-io v0.3.8
[INFO] [stderr]   Downloaded rand_jitter v0.1.4
[INFO] [stderr]   Downloaded rand_hc v0.1.0
[INFO] [stderr]   Downloaded crossbeam v0.7.3
[INFO] [stderr]   Downloaded rand v0.6.5
[INFO] [stderr]   Downloaded balloon v0.0.10
[INFO] [stderr]   Downloaded rand_isaac v0.1.1
[INFO] [stderr]   Downloaded autocfg v0.1.7
[INFO] [stderr]   Downloaded blake2b_simd v0.5.11
[INFO] [stderr]   Downloaded rand_os v0.1.3
[INFO] [stderr]   Downloaded rand_chacha v0.1.1
[INFO] [stderr]   Downloaded rand_pcg v0.1.2
[INFO] [stderr]   Downloaded generic-array v0.12.3
[INFO] [stderr]   Downloaded digest v0.8.1
[INFO] [stderr]   Downloaded kv-log-macro v1.0.7
[INFO] [stderr]   Downloaded hashbrown v0.5.0
[INFO] [stderr]   Downloaded bacteria v0.0.8
[INFO] [stderr]   Downloaded schnorr v0.0.20
[INFO] [stderr]   Downloaded quickcheck v0.8.5
[INFO] [stderr]   Downloaded packed_simd v0.3.3
[INFO] [stderr]   Downloaded pin-utils v0.1.0
[INFO] [stderr]   Downloaded failure_derive v0.1.8
[INFO] [stderr]   Downloaded crossbeam-channel v0.3.9
[INFO] [stderr]   Downloaded num-bigint-dig v0.4.0
[INFO] [stderr]   Downloaded mohan v0.0.53
[INFO] [stderr]   Downloaded thread-id v3.3.0
[INFO] [stderr]   Downloaded rustc-hex v2.1.0
[INFO] [stderr]   Downloaded zeroize_derive v1.0.1
[INFO] [stderr]   Downloaded uint v0.8.5
[INFO] [stderr]   Downloaded synstructure v0.12.4
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 25de0d0d93b0e0fc9d8590b560d434572e327dd138e108978c279c799b89016f
[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" "25de0d0d93b0e0fc9d8590b560d434572e327dd138e108978c279c799b89016f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "25de0d0d93b0e0fc9d8590b560d434572e327dd138e108978c279c799b89016f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25de0d0d93b0e0fc9d8590b560d434572e327dd138e108978c279c799b89016f", kill_on_drop: false }`
[INFO] [stdout] 25de0d0d93b0e0fc9d8590b560d434572e327dd138e108978c279c799b89016f
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 15203bb03b88a32f095716f1459431ed15e6e9e375b624078e85faaf9f4a7739
[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" "15203bb03b88a32f095716f1459431ed15e6e9e375b624078e85faaf9f4a7739", 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] [stderr]    Compiling packed_simd v0.3.3
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling subtle v2.4.0
[INFO] [stderr]    Compiling num-bigint-dig v0.4.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling async-macros v1.0.0
[INFO] [stderr]    Compiling futures-timer v1.0.3
[INFO] [stderr]    Compiling thread-id v3.3.0
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling thiserror-impl v1.0.23
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling zeroize v1.2.0
[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/subtle-2.4.0/src/lib.rs:12:34
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(feature = "nightly", feature(external_doc))]
[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 `subtle`
[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" "15203bb03b88a32f095716f1459431ed15e6e9e375b624078e85faaf9f4a7739", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15203bb03b88a32f095716f1459431ed15e6e9e375b624078e85faaf9f4a7739", kill_on_drop: false }`
[INFO] [stdout] 15203bb03b88a32f095716f1459431ed15e6e9e375b624078e85faaf9f4a7739