[INFO] fetching crate fixed-codec-derive 0.1.0...
[INFO] testing fixed-codec-derive-0.1.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate fixed-codec-derive 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate fixed-codec-derive 0.1.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fixed-codec-derive 0.1.0
[INFO] finished tweaking crates.io crate fixed-codec-derive 0.1.0
[INFO] tweaked toml for crates.io crate fixed-codec-derive 0.1.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 50040dca0e4c84a31a7e89f6e94e21821baa9acae556f16f358b626bafef56ca
[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" "50040dca0e4c84a31a7e89f6e94e21821baa9acae556f16f358b626bafef56ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "50040dca0e4c84a31a7e89f6e94e21821baa9acae556f16f358b626bafef56ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50040dca0e4c84a31a7e89f6e94e21821baa9acae556f16f358b626bafef56ca", kill_on_drop: false }`
[INFO] [stdout] 50040dca0e4c84a31a7e89f6e94e21821baa9acae556f16f358b626bafef56ca
[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" "+1.49.0" "build" "--frozen" "--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] 094dabb9b1478e00d412d18bdcfcbc654a001d52e174e5ca1f6ea7c6042ba5b0
[INFO] running `Command { std: "docker" "start" "-a" "094dabb9b1478e00d412d18bdcfcbc654a001d52e174e5ca1f6ea7c6042ba5b0", kill_on_drop: false }`
[INFO] [stderr]    Compiling fixed-codec-derive v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.10s
[INFO] running `Command { std: "docker" "inspect" "094dabb9b1478e00d412d18bdcfcbc654a001d52e174e5ca1f6ea7c6042ba5b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "094dabb9b1478e00d412d18bdcfcbc654a001d52e174e5ca1f6ea7c6042ba5b0", kill_on_drop: false }`
[INFO] [stdout] 094dabb9b1478e00d412d18bdcfcbc654a001d52e174e5ca1f6ea7c6042ba5b0
[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" "+1.49.0" "test" "--frozen" "--no-run" "--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] e21af9be0cfc5a96de6426ad1f21b5c1f7c626d5c6128f4e28caf6bfc63eb274
[INFO] running `Command { std: "docker" "start" "-a" "e21af9be0cfc5a96de6426ad1f21b5c1f7c626d5c6128f4e28caf6bfc63eb274", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-hex v2.1.0
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling heapsize v0.4.2
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling hashbrown v0.3.1
[INFO] [stderr]    Compiling creep v0.1.1
[INFO] [stderr]    Compiling json v0.12.4
[INFO] [stderr]    Compiling lock_api v0.2.0
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]    Compiling prost-derive v0.6.1
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling rlp v0.4.6
[INFO] [stderr]    Compiling ethereum-types-serialize v0.2.2
[INFO] [stderr]    Compiling impl-serde v0.2.3
[INFO] [stderr]    Compiling bincode v1.3.1
[INFO] [stderr]    Compiling futures-util v0.3.8
[INFO] [stderr]    Compiling fixed-hash v0.5.2
[INFO] [stderr]    Compiling impl-rlp v0.2.1
[INFO] [stderr]    Compiling tiny-keccak v1.5.0
[INFO] [stderr]    Compiling fixed-hash v0.2.5
[INFO] [stderr]    Compiling uint v0.4.1
[INFO] [stderr]    Compiling hasher v0.1.3
[INFO] [stderr]    Compiling ethbloom v0.8.1
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling ethbloom v0.5.3
[INFO] [stderr]    Compiling ethereum-types v0.4.2
[INFO] [stderr]    Compiling prost v0.6.1
[INFO] [stderr]    Compiling rlp v0.3.0
[INFO] [stderr]    Compiling cita_trie v2.0.0
[INFO] [stderr]    Compiling futures-executor v0.3.8
[INFO] [stderr]    Compiling futures v0.3.8
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]    Compiling muta-protocol v0.1.0-alpha.1
[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/muta-protocol-0.1.0-alpha.1/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" "e21af9be0cfc5a96de6426ad1f21b5c1f7c626d5c6128f4e28caf6bfc63eb274", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e21af9be0cfc5a96de6426ad1f21b5c1f7c626d5c6128f4e28caf6bfc63eb274", kill_on_drop: false }`
[INFO] [stdout] e21af9be0cfc5a96de6426ad1f21b5c1f7c626d5c6128f4e28caf6bfc63eb274