[INFO] cloning repository https://github.com/K-atc/libfuzzer-mutation-graph-tool
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/K-atc/libfuzzer-mutation-graph-tool" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FK-atc%2Flibfuzzer-mutation-graph-tool", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FK-atc%2Flibfuzzer-mutation-graph-tool'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c6527652381a67e141058ba4c92d423e638a1331
[INFO] testing K-atc/libfuzzer-mutation-graph-tool against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FK-atc%2Flibfuzzer-mutation-graph-tool" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/K-atc/libfuzzer-mutation-graph-tool on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/K-atc/libfuzzer-mutation-graph-tool
[INFO] finished tweaking git repo https://github.com/K-atc/libfuzzer-mutation-graph-tool
[INFO] tweaked toml for git repo https://github.com/K-atc/libfuzzer-mutation-graph-tool written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/K-atc/libfuzzer-mutation-graph-tool already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/K-atc/binary-diff-rs.git`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bcmp v0.4.1
[INFO] [stderr]   Downloaded bytepack v0.4.1
[INFO] [stderr]   Downloaded bytepack_derive v0.2.0
[INFO] [stderr]   Downloaded env_logger v0.8.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e0b75098a163a68c0f73e9906159fd79d9797d18d8f5e8f784691f1e1bfb3e8
[INFO] running `Command { std: "docker" "start" "-a" "1e0b75098a163a68c0f73e9906159fd79d9797d18d8f5e8f784691f1e1bfb3e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e0b75098a163a68c0f73e9906159fd79d9797d18d8f5e8f784691f1e1bfb3e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e0b75098a163a68c0f73e9906159fd79d9797d18d8f5e8f784691f1e1bfb3e8", kill_on_drop: false }`
[INFO] [stdout] 1e0b75098a163a68c0f73e9906159fd79d9797d18d8f5e8f784691f1e1bfb3e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6991fcbb3db0cc7b5c58ba01bc0e8d96225e1b5f9434c1df6749b3c1529cf87c
[INFO] running `Command { std: "docker" "start" "-a" "6991fcbb3db0cc7b5c58ba01bc0e8d96225e1b5f9434c1df6749b3c1529cf87c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling bytepack_derive v0.2.0
[INFO] [stderr]    Compiling bytepack v0.4.1
[INFO] [stderr]    Compiling bcmp v0.4.1
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling env_logger v0.8.4
[INFO] [stderr]    Compiling binary-diff v0.1.0 (https://github.com/K-atc/binary-diff-rs.git#18b0db7f)
[INFO] [stderr]    Compiling libfuzzer-mutation-graph-tool v0.1.0 (/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(binary_heap_into_iter_sorted)]
[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 `libfuzzer-mutation-graph-tool` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "6991fcbb3db0cc7b5c58ba01bc0e8d96225e1b5f9434c1df6749b3c1529cf87c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6991fcbb3db0cc7b5c58ba01bc0e8d96225e1b5f9434c1df6749b3c1529cf87c", kill_on_drop: false }`
[INFO] [stdout] 6991fcbb3db0cc7b5c58ba01bc0e8d96225e1b5f9434c1df6749b3c1529cf87c