[INFO] fetching crate casper-contract 1.3.4...
[INFO] checking casper-contract-1.3.4 against beta-2021-10-15 for beta-1.56-3
[INFO] extracting crate casper-contract 1.3.4 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate casper-contract 1.3.4 on toolchain beta-2021-10-15
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate casper-contract 1.3.4
[INFO] finished tweaking crates.io crate casper-contract 1.3.4
[INFO] tweaked toml for crates.io crate casper-contract 1.3.4 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 86e8c7d89ac9e9b765dacc6b32a103c283d40e02e63130de4094b9c69544765d
[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" "86e8c7d89ac9e9b765dacc6b32a103c283d40e02e63130de4094b9c69544765d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86e8c7d89ac9e9b765dacc6b32a103c283d40e02e63130de4094b9c69544765d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86e8c7d89ac9e9b765dacc6b32a103c283d40e02e63130de4094b9c69544765d", kill_on_drop: false }`
[INFO] [stdout] 86e8c7d89ac9e9b765dacc6b32a103c283d40e02e63130de4094b9c69544765d
[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" "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-2021-10-15" "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] 0e200e4b71daf5cb6bcf6bcf93da475349656f58110377f1162de2da1d913f05
[INFO] running `Command { std: "docker" "start" "-a" "0e200e4b71daf5cb6bcf6bcf93da475349656f58110377f1162de2da1d913f05", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking subtle v2.4.1
[INFO] [stderr]     Checking wyz v0.2.0
[INFO] [stderr]     Checking radium v0.3.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.14
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]    Compiling datasize_derive v0.2.9
[INFO] [stderr]    Compiling displaydoc v0.1.7
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling zeroize_derive v1.2.0
[INFO] [stderr]     Checking sha2 v0.9.8
[INFO] [stderr]     Checking signature v1.2.2
[INFO] [stderr]     Checking crypto-mac v0.10.1
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking bitvec v0.18.5
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking uint v0.9.1
[INFO] [stderr]     Checking ed25519 v1.2.0
[INFO] [stderr]     Checking blake2 v0.9.2
[INFO] [stderr]     Checking hmac v0.10.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking zeroize v1.4.2
[INFO] [stderr]     Checking datasize v0.2.9
[INFO] [stderr]     Checking curve25519-dalek v3.2.0
[INFO] [stderr]     Checking ff v0.8.0
[INFO] [stderr]     Checking group v0.8.0
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking elliptic-curve v0.8.5
[INFO] [stderr]     Checking ed25519-dalek v1.0.1
[INFO] [stderr]     Checking ecdsa v0.10.2
[INFO] [stderr]     Checking k256 v0.7.3
[INFO] [stderr]     Checking casper-types v1.3.4
[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/casper-types-1.3.4/src/lib.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     feature(min_specialization, try_reserve)
[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 `casper-types` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "0e200e4b71daf5cb6bcf6bcf93da475349656f58110377f1162de2da1d913f05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e200e4b71daf5cb6bcf6bcf93da475349656f58110377f1162de2da1d913f05", kill_on_drop: false }`
[INFO] [stdout] 0e200e4b71daf5cb6bcf6bcf93da475349656f58110377f1162de2da1d913f05
