[INFO] fetching crate unigraph_delta 0.1.1-alpha.0...
[INFO] testing unigraph_delta-0.1.1-alpha.0 against 1.99.0-beta.8 for beta-1.100-2
[INFO] extracting crate unigraph_delta 0.1.1-alpha.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate unigraph_delta 0.1.1-alpha.0
[INFO] finished tweaking crates.io crate unigraph_delta 0.1.1-alpha.0
[INFO] tweaked toml for crates.io crate unigraph_delta 0.1.1-alpha.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate unigraph_delta 0.1.1-alpha.0 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate unigraph_delta 0.1.1-alpha.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded k9 v0.12.0
[INFO] [stderr]   Downloaded unigraph_delta_derive v0.1.1-alpha.0
[INFO] [stderr]   Downloaded terminal_size v0.2.6
[INFO] [stderr]   Downloaded regex-syntax v0.8.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5
[INFO] running `Command { std: "docker" "start" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.143
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling unigraph_delta_derive v0.1.1-alpha.0
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling unigraph_delta v0.1.1-alpha.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.90s
[INFO] running `Command { std: "docker" "inspect" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.185
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling rustix v0.37.28
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling regex-syntax v0.8.6
[INFO] [stderr]    Compiling colored v2.2.0
[INFO] [stderr]    Compiling diff v0.1.13
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling regex-automata v0.4.14
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]    Compiling terminal_size v0.2.6
[INFO] [stderr]    Compiling regex v1.12.3
[INFO] [stderr]    Compiling k9 v0.12.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/k9-0.12.0/src/lib.rs:5:55
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "custom_comparison_formatters", feature(specialization))]
[INFO] [stdout]   |                                                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `k9` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5", kill_on_drop: false }`
[INFO] [stdout] a95339262c100ad30a93edf3db07a7268fda01ac0e65ef0e339b7a9d541c47e5
