[INFO] fetching crate muta-keypair 0.1.0-alpha.1...
[INFO] documenting muta-keypair-0.1.0-alpha.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate muta-keypair 0.1.0-alpha.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate muta-keypair 0.1.0-alpha.1 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate muta-keypair 0.1.0-alpha.1
[INFO] finished tweaking crates.io crate muta-keypair 0.1.0-alpha.1
[INFO] tweaked toml for crates.io crate muta-keypair 0.1.0-alpha.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate muta-keypair 0.1.0-alpha.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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 rustc-hex v2.0.1
[INFO] [stderr]   Downloaded zeroize v0.9.3
[INFO] [stderr]   Downloaded wasm-bindgen-webidl v0.2.57
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.57
[INFO] [stderr]   Downloaded json v0.12.0
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.57
[INFO] [stderr]   Downloaded web-sys v0.3.34
[INFO] [stderr]   Downloaded bls_amcl v0.7.0
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.57
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.57
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.57
[INFO] [stderr]   Downloaded amcl_wrapper v0.2.3
[INFO] [stderr]   Downloaded rlp v0.4.4
[INFO] [stderr]   Downloaded secret_sharing v0.1.1
[INFO] [stderr]   Downloaded flatbuffers-verifier v0.2.1
[INFO] [stderr]   Downloaded secp256k1-sys v0.1.1
[INFO] [stderr]   Downloaded secp256k1 v0.17.1
[INFO] [stderr]   Downloaded bumpalo v3.1.1
[INFO] [stderr]   Downloaded secp256k1 v0.15.5
[INFO] [stderr]   Downloaded ophelia-secp256k1 v0.2.0
[INFO] [stderr]   Downloaded twofish v0.2.0
[INFO] [stderr]   Downloaded unsigned-varint v0.2.3
[INFO] [stderr]   Downloaded muta-vendor-prost-derive v0.5.1
[INFO] [stderr]   Downloaded ophelia-bls-amcl v0.1.0
[INFO] [stderr]   Downloaded ophelia-hasher v0.2.0
[INFO] [stderr]   Downloaded flatbuffers v0.6.0
[INFO] [stderr]   Downloaded muta-vendor-prost v0.5.1
[INFO] [stderr]   Downloaded num-bigint v0.2.4
[INFO] [stderr]   Downloaded js-sys v0.3.34
[INFO] [stderr]   Downloaded tentacle-secio v0.1.11
[INFO] [stderr]   Downloaded miracl_amcl v3.2.5
[INFO] [stderr]   Downloaded ophelia-derive v0.2.0
[INFO] [stderr]   Downloaded ophelia v0.2.0
[INFO] [stderr]   Downloaded muta-protocol v0.1.0-alpha.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a5d56402871637a263b1f6f8467438ae7f0e82c72d84820fb6d6fa2a5ce2bf5d
[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" "a5d56402871637a263b1f6f8467438ae7f0e82c72d84820fb6d6fa2a5ce2bf5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a5d56402871637a263b1f6f8467438ae7f0e82c72d84820fb6d6fa2a5ce2bf5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5d56402871637a263b1f6f8467438ae7f0e82c72d84820fb6d6fa2a5ce2bf5d", kill_on_drop: false }`
[INFO] [stdout] a5d56402871637a263b1f6f8467438ae7f0e82c72d84820fb6d6fa2a5ce2bf5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c08964fba3fd555aed8fdb4ad1372831051008820cb4289e7a22ec6bc02ad30f
[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" "c08964fba3fd555aed8fdb4ad1372831051008820cb4289e7a22ec6bc02ad30f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking rustc-hex v2.0.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling heapsize v0.4.2
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]     Checking keccak v0.1.0
[INFO] [stderr]    Compiling anyhow v1.0.26
[INFO] [stderr]     Checking futures-core v0.3.1
[INFO] [stderr]     Checking futures-sink v0.3.1
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]     Checking miracl_amcl v3.2.5
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]     Checking unsigned-varint v0.2.3
[INFO] [stderr]     Checking json v0.12.0
[INFO] [stderr]     Checking creep v0.1.1
[INFO] [stderr]     Checking bs58 v0.2.5
[INFO] [stderr]     Checking hex v0.4.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]    Compiling secp256k1-sys v0.1.1
[INFO] [stderr]    Compiling ring v0.16.9
[INFO] [stderr]    Compiling secp256k1 v0.15.5
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.4
[INFO] [stderr]     Checking tokio-sync v0.1.7
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]     Checking lock_api v0.2.0
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]     Checking futures-channel v0.3.1
[INFO] [stderr]     Checking rlp v0.4.4
[INFO] [stderr]     Checking tokio-executor v0.1.9
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling memoffset v0.5.3
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking num_cpus v1.11.1
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking impl-rlp v0.2.1
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]     Checking tokio-current-thread v0.1.6
[INFO] [stderr]     Checking tokio-timer v0.2.12
[INFO] [stderr]     Checking flatbuffers v0.6.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking uint v0.4.1
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking hasher v0.1.3
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]     Checking flatbuffers-verifier v0.2.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]    Compiling backtrace v0.3.40
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking secp256k1 v0.17.1
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking fixed-hash v0.2.5
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.2
[INFO] [stderr]     Checking tokio-threadpool v0.1.17
[INFO] [stderr]     Checking parking_lot_core v0.5.0
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking block-cipher-trait v0.6.2
[INFO] [stderr]     Checking stream-cipher v0.3.2
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]    Compiling regex v1.3.1
[INFO] [stderr]     Checking tokio-reactor v0.1.11
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking parking_lot v0.8.0
[INFO] [stderr]     Checking aes-soft v0.3.3
[INFO] [stderr]     Checking twofish v0.2.0
[INFO] [stderr]     Checking ctr v0.3.2
[INFO] [stderr]     Checking hmac v0.7.1
[INFO] [stderr]     Checking sha3 v0.8.2
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]     Checking fixed-hash v0.5.2
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio-uds v0.2.5
[INFO] [stderr]     Checking tokio-udp v0.1.5
[INFO] [stderr]     Checking aes-ctr v0.3.0
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]    Compiling zeroize_derive v0.9.3
[INFO] [stderr]     Checking tentacle-secio v0.1.11
[INFO] [stderr]     Checking zeroize v0.9.3
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling thiserror-impl v1.0.9
[INFO] [stderr]    Compiling ophelia-derive v0.2.0
[INFO] [stderr]    Compiling async-trait v0.1.22
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]     Checking thiserror v1.0.9
[INFO] [stderr]    Compiling muta-vendor-prost-derive v0.5.1
[INFO] [stderr]     Checking ophelia-hasher v0.2.0
[INFO] [stderr]     Checking ophelia v0.2.0
[INFO] [stderr]     Checking ophelia-secp256k1 v0.2.0
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]     Checking muta-vendor-prost v0.5.1
[INFO] [stderr]     Checking futures-executor v0.3.1
[INFO] [stderr]     Checking futures v0.3.1
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking serde_json v1.0.44
[INFO] [stderr]     Checking ethereum-types-serialize v0.2.2
[INFO] [stderr]     Checking impl-serde v0.2.3
[INFO] [stderr]     Checking bincode v1.2.1
[INFO] [stderr]     Checking ethbloom v0.5.3
[INFO] [stderr]     Checking ethbloom v0.8.1
[INFO] [stderr]     Checking ethereum-types v0.4.2
[INFO] [stderr]     Checking amcl_wrapper v0.2.3
[INFO] [stderr]     Checking rlp v0.3.0
[INFO] [stderr]     Checking secret_sharing v0.1.1
[INFO] [stderr]     Checking cita_trie v2.0.0
[INFO] [stderr]     Checking bls_amcl v0.7.0
[INFO] [stderr]     Checking muta-protocol v0.1.0-alpha.0
[INFO] [stderr]     Checking ophelia-bls-amcl v0.1.0
[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/muta-protocol-0.1.0-alpha.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `muta-protocol`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "c08964fba3fd555aed8fdb4ad1372831051008820cb4289e7a22ec6bc02ad30f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c08964fba3fd555aed8fdb4ad1372831051008820cb4289e7a22ec6bc02ad30f", kill_on_drop: false }`
[INFO] [stdout] c08964fba3fd555aed8fdb4ad1372831051008820cb4289e7a22ec6bc02ad30f