[INFO] fetching crate kf-protocol-message 2.0.0...
[INFO] checking kf-protocol-message-2.0.0 against 1.95.0 for pr-155915
[INFO] extracting crate kf-protocol-message 2.0.0 into /workspace/builds/worker-5-tc1/source
[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-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate kf-protocol-message 2.0.0 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 81 packages to latest compatible versions
[INFO] [stderr]       Adding flv-util v0.4.0 (available: v0.5.2)
[INFO] [stderr]       Adding paste v0.1.18 (available: v1.0.15)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded paste v0.1.18
[INFO] [stderr]   Downloaded tracing-log v0.1.4
[INFO] [stderr]   Downloaded kf-protocol-core v0.1.2
[INFO] [stderr]   Downloaded flv-util v0.4.0
[INFO] [stderr]   Downloaded num-derive v0.2.5
[INFO] [stderr]   Downloaded crc32c v0.5.0
[INFO] [stderr]   Downloaded kf-protocol-derive v0.2.0
[INFO] [stderr]   Downloaded paste-impl v0.1.18
[INFO] [stderr]   Downloaded kf-protocol-api v2.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 76e8ab8fb7c98c72599b97cd00439b2e94054bddc064cada327d36e262bf84bb
[INFO] running `Command { std: "docker" "start" "-a" "76e8ab8fb7c98c72599b97cd00439b2e94054bddc064cada327d36e262bf84bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "76e8ab8fb7c98c72599b97cd00439b2e94054bddc064cada327d36e262bf84bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76e8ab8fb7c98c72599b97cd00439b2e94054bddc064cada327d36e262bf84bb", kill_on_drop: false }`
[INFO] [stdout] 76e8ab8fb7c98c72599b97cd00439b2e94054bddc064cada327d36e262bf84bb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0e1968d861e1461b0e10ffaa4d843f74ef71a5d5493c6595be48d58ba3a40afa
[INFO] running `Command { std: "docker" "start" "-a" "0e1968d861e1461b0e10ffaa4d843f74ef71a5d5493c6595be48d58ba3a40afa", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking tracing-core v0.1.36
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]    Compiling crc32c v0.5.0
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]     Checking chrono v0.4.44
[INFO] [stderr]    Compiling log v0.4.29
[INFO] [stderr]     Checking content_inspector v0.2.4
[INFO] [stderr]     Checking tracing-log v0.1.4
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling kf-protocol-derive v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling tracing-attributes v0.1.31
[INFO] [stderr]     Checking tracing v0.1.44
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking tracing-serde v0.1.3
[INFO] [stderr]     Checking 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/index.crates.io-1949cf8c6b5b557f/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] [stderr]     Checking tracing-subscriber v0.2.25
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kf-protocol-core` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "0e1968d861e1461b0e10ffaa4d843f74ef71a5d5493c6595be48d58ba3a40afa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e1968d861e1461b0e10ffaa4d843f74ef71a5d5493c6595be48d58ba3a40afa", kill_on_drop: false }`
[INFO] [stdout] 0e1968d861e1461b0e10ffaa4d843f74ef71a5d5493c6595be48d58ba3a40afa
