[INFO] fetching crate kc 0.5.0...
[INFO] testing kc-0.5.0 against beta-2023-04-20 for beta-1.70-1
[INFO] extracting crate kc 0.5.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate kc 0.5.0 on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0-tc2/source/.cargo/config.toml
[INFO] started tweaking crates.io crate kc 0.5.0
[INFO] finished tweaking crates.io crate kc 0.5.0
[INFO] tweaked toml for crates.io crate kc 0.5.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate kc 0.5.0 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" "+beta-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded globset v0.4.9
[INFO] [stderr]   Downloaded terminal_size v0.2.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5ad0c666831318cff105c5287b7f17ccb5e478dbc4acceb198e41377126cc84c
[INFO] running `Command { std: "docker" "start" "-a" "5ad0c666831318cff105c5287b7f17ccb5e478dbc4acceb198e41377126cc84c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5ad0c666831318cff105c5287b7f17ccb5e478dbc4acceb198e41377126cc84c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ad0c666831318cff105c5287b7f17ccb5e478dbc4acceb198e41377126cc84c", kill_on_drop: false }`
[INFO] [stdout] 5ad0c666831318cff105c5287b7f17ccb5e478dbc4acceb198e41377126cc84c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 149632962f5f4acba16705d0c88dfe1e71fe918263cdaf022fb9fb6e0b80ac84
[INFO] running `Command { std: "docker" "start" "-a" "149632962f5f4acba16705d0c88dfe1e71fe918263cdaf022fb9fb6e0b80ac84", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling io-lifetimes v1.0.9
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling rustix v0.36.11
[INFO] [stderr]    Compiling once_cell v1.13.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.10
[INFO] [stderr]    Compiling regex-syntax v0.6.27
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling linux-raw-sys v0.1.4
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling walkdir v2.3.2
[INFO] [stderr]    Compiling thread_local v1.1.4
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling bstr v0.2.17
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling colored v2.0.0
[INFO] [stderr]    Compiling regex v1.6.0
[INFO] [stderr]    Compiling globset v0.4.9
[INFO] [stderr]    Compiling terminal_size v0.2.5
[INFO] [stderr]    Compiling ignore v0.4.18
[INFO] [stderr]    Compiling kc v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io_error_more)]
[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 `kc` (bin "kc") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "149632962f5f4acba16705d0c88dfe1e71fe918263cdaf022fb9fb6e0b80ac84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "149632962f5f4acba16705d0c88dfe1e71fe918263cdaf022fb9fb6e0b80ac84", kill_on_drop: false }`
[INFO] [stdout] 149632962f5f4acba16705d0c88dfe1e71fe918263cdaf022fb9fb6e0b80ac84
