[INFO] fetching crate ys-sniffer 0.2.4...
[INFO] testing ys-sniffer-0.2.4 against 1.91.0 for beta-1.92-2
[INFO] extracting crate ys-sniffer 0.2.4 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate ys-sniffer 0.2.4
[INFO] finished tweaking crates.io crate ys-sniffer 0.2.4
[INFO] tweaked toml for crates.io crate ys-sniffer 0.2.4 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ys-sniffer 0.2.4 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ys-sniffer 0.2.4 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ys-kcp v1.2.1
[INFO] [stderr]   Downloaded pcap v2.2.0
[INFO] [stderr]   Downloaded protoshark 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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3bdb5f6b929ddaa65a26a9016dde5ea3d9db1ccb45f44f56b438e26bb024a48c
[INFO] running `Command { std: "docker" "start" "-a" "3bdb5f6b929ddaa65a26a9016dde5ea3d9db1ccb45f44f56b438e26bb024a48c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3bdb5f6b929ddaa65a26a9016dde5ea3d9db1ccb45f44f56b438e26bb024a48c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bdb5f6b929ddaa65a26a9016dde5ea3d9db1ccb45f44f56b438e26bb024a48c", kill_on_drop: false }`
[INFO] [stdout] 3bdb5f6b929ddaa65a26a9016dde5ea3d9db1ccb45f44f56b438e26bb024a48c
[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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 63279c6c4ed53694b9a67f6b7a5c3b2deb857a321205d4c45fd9b83f086e9cd1
[INFO] running `Command { std: "docker" "start" "-a" "63279c6c4ed53694b9a67f6b7a5c3b2deb857a321205d4c45fd9b83f086e9cd1", kill_on_drop: false }`
[INFO] [stderr]    Compiling zerocopy v0.8.25
[INFO] [stderr]    Compiling libc v0.2.172
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling regex-syntax v0.8.5
[INFO] [stderr]    Compiling der v0.7.10
[INFO] [stderr]    Compiling libloading v0.8.8
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling num-bigint-dig v0.8.4
[INFO] [stderr]    Compiling lazy_static v1.5.0
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling ys-kcp v1.2.1
[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/ys-kcp-1.2.1/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(stmt_expr_attributes)]
[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 `ys-kcp` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "63279c6c4ed53694b9a67f6b7a5c3b2deb857a321205d4c45fd9b83f086e9cd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63279c6c4ed53694b9a67f6b7a5c3b2deb857a321205d4c45fd9b83f086e9cd1", kill_on_drop: false }`
[INFO] [stdout] 63279c6c4ed53694b9a67f6b7a5c3b2deb857a321205d4c45fd9b83f086e9cd1