[INFO] fetching crate jfc 0.1.12...
[INFO] testing jfc-0.1.12 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate jfc 0.1.12 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate jfc 0.1.12
[INFO] finished tweaking crates.io crate jfc 0.1.12
[INFO] tweaked toml for crates.io crate jfc 0.1.12 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate jfc 0.1.12 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate jfc 0.1.12 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-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 563b354d5d87bf38d7f33f4213de8978cc4bb00d530ca50ec0c159bc6e26bbc3
[INFO] running `Command { std: "docker" "start" "-a" "563b354d5d87bf38d7f33f4213de8978cc4bb00d530ca50ec0c159bc6e26bbc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "563b354d5d87bf38d7f33f4213de8978cc4bb00d530ca50ec0c159bc6e26bbc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "563b354d5d87bf38d7f33f4213de8978cc4bb00d530ca50ec0c159bc6e26bbc3", kill_on_drop: false }`
[INFO] [stdout] 563b354d5d87bf38d7f33f4213de8978cc4bb00d530ca50ec0c159bc6e26bbc3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5650a58c4e3fb707a41f6b1d34d04db4700a8dfc771269416ad1e3d53622d763
[INFO] running `Command { std: "docker" "start" "-a" "5650a58c4e3fb707a41f6b1d34d04db4700a8dfc771269416ad1e3d53622d763", kill_on_drop: false }`
[INFO] [stderr]    Compiling utf8parse v0.2.1
[INFO] [stderr]    Compiling colorchoice v1.0.0
[INFO] [stderr]    Compiling anstyle-query v1.0.2
[INFO] [stderr]    Compiling anstyle v1.0.6
[INFO] [stderr]    Compiling clap_lex v0.7.0
[INFO] [stderr]    Compiling strsim v0.11.0
[INFO] [stderr]    Compiling unicode-width v0.2.1
[INFO] [stderr]    Compiling colored v3.0.0
[INFO] [stderr]    Compiling generic_tokenizer v0.1.0
[INFO] [stderr]    Compiling anstyle-parse v0.2.3
[INFO] [stderr]    Compiling anstream v0.6.11
[INFO] [stderr]    Compiling codespan-reporting v0.12.0
[INFO] [stderr]    Compiling clap_builder v4.5.0
[INFO] [stderr]    Compiling clap v4.5.0
[INFO] [stderr]    Compiling jfc v0.1.12 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(str_from_utf16_endian)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `error::Error` and `stdin`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     error::Error,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 6 |     fs::OpenOptions,
[INFO] [stdout] 7 |     io::{stderr, stdin, stdout, BufRead, BufReader, Read, Write},
[INFO] [stdout]   |                  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `jfc` (bin "jfc") due to 1 previous error; 1 warning emitted
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "5650a58c4e3fb707a41f6b1d34d04db4700a8dfc771269416ad1e3d53622d763", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5650a58c4e3fb707a41f6b1d34d04db4700a8dfc771269416ad1e3d53622d763", kill_on_drop: false }`
[INFO] [stdout] 5650a58c4e3fb707a41f6b1d34d04db4700a8dfc771269416ad1e3d53622d763
