[INFO] fetching crate kf-protocol-message 2.0.0...
[INFO] testing kf-protocol-message-2.0.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate kf-protocol-message 2.0.0 into /workspace/builds/worker-78/source
[INFO] validating manifest of crates.io crate kf-protocol-message 2.0.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate kf-protocol-message 2.0.0
[INFO] finished tweaking crates.io crate kf-protocol-message 2.0.0
[INFO] tweaked toml for crates.io crate kf-protocol-message 2.0.0 written to /workspace/builds/worker-78/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", 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]  Downloading crates ...
[INFO] [stderr]   Downloaded crc32c v0.5.0
[INFO] [stderr]   Downloaded flv-util v0.4.0
[INFO] [stderr]   Downloaded kf-protocol-derive v0.2.0
[INFO] [stderr]   Downloaded kf-protocol-api v2.0.0
[INFO] [stderr]   Downloaded kf-protocol-core v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b6bfe7734d42b88dab0776557105851f04fda8dbfee0e023e472302a2848b45
[INFO] running `Command { std: "docker" "start" "-a" "5b6bfe7734d42b88dab0776557105851f04fda8dbfee0e023e472302a2848b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b6bfe7734d42b88dab0776557105851f04fda8dbfee0e023e472302a2848b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b6bfe7734d42b88dab0776557105851f04fda8dbfee0e023e472302a2848b45", kill_on_drop: false }`
[INFO] [stdout] 5b6bfe7734d42b88dab0776557105851f04fda8dbfee0e023e472302a2848b45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f1e496893add50940838d06e29f44f6bc6075ecfbaebd07b76a2727da06fbf2
[INFO] running `Command { std: "docker" "start" "-a" "1f1e496893add50940838d06e29f44f6bc6075ecfbaebd07b76a2727da06fbf2", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling crc32c v0.5.0
[INFO] [stderr]    Compiling bytes v0.5.6
[INFO] [stderr]    Compiling content_inspector v0.2.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling kf-protocol-derive v0.2.0
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]    Compiling paste v0.1.18
[INFO] [stderr]    Compiling tracing-serde v0.1.3
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling kf-protocol-core v0.1.2
[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/kf-protocol-core-0.1.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[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 `kf-protocol-core` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "1f1e496893add50940838d06e29f44f6bc6075ecfbaebd07b76a2727da06fbf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f1e496893add50940838d06e29f44f6bc6075ecfbaebd07b76a2727da06fbf2", kill_on_drop: false }`
[INFO] [stdout] 1f1e496893add50940838d06e29f44f6bc6075ecfbaebd07b76a2727da06fbf2