[INFO] fetching crate casper-execution-engine 1.3.4...
[INFO] checking casper-execution-engine-1.3.4 against 1.55.0 for beta-1.56-3
[INFO] extracting crate casper-execution-engine 1.3.4 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate casper-execution-engine 1.3.4 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate casper-execution-engine 1.3.4
[INFO] finished tweaking crates.io crate casper-execution-engine 1.3.4
[INFO] tweaked toml for crates.io crate casper-execution-engine 1.3.4 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", 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] bc8a15d23f006270342c3dc601d9c26c4ddc05e0f4c4fb13a95ced66928161fd
[INFO] running `Command { std: "docker" "start" "-a" "bc8a15d23f006270342c3dc601d9c26c4ddc05e0f4c4fb13a95ced66928161fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bc8a15d23f006270342c3dc601d9c26c4ddc05e0f4c4fb13a95ced66928161fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc8a15d23f006270342c3dc601d9c26c4ddc05e0f4c4fb13a95ced66928161fd", kill_on_drop: false }`
[INFO] [stdout] bc8a15d23f006270342c3dc601d9c26c4ddc05e0f4c4fb13a95ced66928161fd
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aacd414c6f3ffbc59bde5e726c85a74b41739e4700a8d27586f0f5aeb90c344d
[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" "aacd414c6f3ffbc59bde5e726c85a74b41739e4700a8d27586f0f5aeb90c344d", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking subtle v2.4.1
[INFO] [stderr]     Checking wyz v0.2.0
[INFO] [stderr]     Checking radium v0.3.0
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling schemars v0.8.6
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking quick-error v2.0.1
[INFO] [stderr]     Checking dyn-clone v1.0.4
[INFO] [stderr]     Checking base16 v0.2.1
[INFO] [stderr]     Checking hex_fmt v0.3.0
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking assert_matches v1.5.0
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling lmdb-sys v0.8.0
[INFO] [stderr]     Checking wasmi-validation v0.3.0
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]    Compiling serde_derive_internals v0.25.0
[INFO] [stderr]    Compiling datasize_derive v0.2.9
[INFO] [stderr]    Compiling displaydoc v0.1.7
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_xorshift v0.3.0
[INFO] [stderr]     Checking signature v1.2.2
[INFO] [stderr]     Checking num-bigint v0.2.6
[INFO] [stderr]     Checking chrono v0.4.19
[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 v0.7.3
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking curve25519-dalek v3.2.0
[INFO] [stderr]     Checking hmac v0.10.1
[INFO] [stderr]     Checking blake2 v0.9.2
[INFO] [stderr]    Compiling schemars_derive v0.8.6
[INFO] [stderr]     Checking num-rational v0.2.4
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]     Checking rusty-fork v0.3.0
[INFO] [stderr]     Checking wasmi v0.8.0
[INFO] [stderr]     Checking proptest v1.0.0
[INFO] [stderr]     Checking datasize v0.2.9
[INFO] [stderr]     Checking ff v0.8.0
[INFO] [stderr]     Checking group v0.8.0
[INFO] [stderr]     Checking elliptic-curve v0.8.5
[INFO] [stderr]     Checking ecdsa v0.10.2
[INFO] [stderr]     Checking lmdb v0.8.0
[INFO] [stderr]     Checking k256 v0.7.3
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking serde_bytes v0.11.5
[INFO] [stderr]     Checking ed25519 v1.2.0
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking ed25519-dalek v1.0.1
[INFO] [stderr]     Checking uint v0.9.1
[INFO] [stderr]     Checking hex-buffer-serde v0.2.2
[INFO] [stderr]     Checking pwasm-utils v0.16.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stderr]     Checking casper-types v1.3.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable 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" "aacd414c6f3ffbc59bde5e726c85a74b41739e4700a8d27586f0f5aeb90c344d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aacd414c6f3ffbc59bde5e726c85a74b41739e4700a8d27586f0f5aeb90c344d", kill_on_drop: false }`
[INFO] [stdout] aacd414c6f3ffbc59bde5e726c85a74b41739e4700a8d27586f0f5aeb90c344d
