[INFO] cloning repository https://github.com/ys4e/ys-kcp
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ys4e/ys-kcp" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fys4e%2Fys-kcp", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fys4e%2Fys-kcp'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ee20a3d29191c4da52784048a29283bb972a331c
[INFO] checking ys4e/ys-kcp against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fys4e%2Fys-kcp" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ys4e/ys-kcp
[INFO] finished tweaking git repo https://github.com/ys4e/ys-kcp
[INFO] tweaked toml for git repo https://github.com/ys4e/ys-kcp written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ys4e/ys-kcp 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] crate git repo https://github.com/ys4e/ys-kcp 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sha1 v0.6.1
[INFO] [stderr]   Downloaded base-x v0.2.11
[INFO] [stderr]   Downloaded serde_derive v1.0.201
[INFO] [stderr]   Downloaded sha1_smol v1.0.0
[INFO] [stderr]   Downloaded cc v1.2.10
[INFO] [stderr]   Downloaded xxhash-rust v0.8.10
[INFO] [stderr]   Downloaded env_logger v0.8.4
[INFO] [stderr]   Downloaded serde v1.0.201
[INFO] [stderr]   Downloaded const_fn v0.4.10
[INFO] [stderr]   Downloaded syn v2.0.63
[INFO] [stderr]   Downloaded libc v0.2.154
[INFO] [stderr]   Downloaded tokio v1.43.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] e40c950476226baea1407a0ceefda5f746634960ec1f091283f436407cdec098
[INFO] running `Command { std: "docker" "start" "-a" "e40c950476226baea1407a0ceefda5f746634960ec1f091283f436407cdec098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e40c950476226baea1407a0ceefda5f746634960ec1f091283f436407cdec098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e40c950476226baea1407a0ceefda5f746634960ec1f091283f436407cdec098", kill_on_drop: false }`
[INFO] [stdout] e40c950476226baea1407a0ceefda5f746634960ec1f091283f436407cdec098
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 4a935013035d87992f10fa88d0dbe90906b1685f281d1c277e987894e15cf900
[INFO] running `Command { std: "docker" "start" "-a" "4a935013035d87992f10fa88d0dbe90906b1685f281d1c277e987894e15cf900", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling proc-macro2 v1.0.82
[INFO] [stderr]    Compiling standback v0.2.17
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling proc-macro-hack v0.5.20+deprecated
[INFO] [stderr]     Checking memchr v2.7.2
[INFO] [stderr]    Compiling const_fn v0.4.10
[INFO] [stderr]     Checking regex-syntax v0.8.3
[INFO] [stderr]    Compiling time v0.2.27
[INFO] [stderr]     Checking log v0.4.21
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking bytes v1.6.0
[INFO] [stderr]     Checking termcolor v1.4.1
[INFO] [stderr]     Checking ys-kcp v1.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> 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" "4a935013035d87992f10fa88d0dbe90906b1685f281d1c277e987894e15cf900", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a935013035d87992f10fa88d0dbe90906b1685f281d1c277e987894e15cf900", kill_on_drop: false }`
[INFO] [stdout] 4a935013035d87992f10fa88d0dbe90906b1685f281d1c277e987894e15cf900
