[INFO] fetching crate topograph 0.3.1-alpha.1...
[INFO] testing topograph-0.3.1-alpha.1 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate topograph 0.3.1-alpha.1 into /workspace/builds/worker-16/source
[INFO] validating manifest of crates.io crate topograph 0.3.1-alpha.1 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate topograph 0.3.1-alpha.1
[INFO] finished tweaking crates.io crate topograph 0.3.1-alpha.1
[INFO] tweaked toml for crates.io crate topograph 0.3.1-alpha.1 written to /workspace/builds/worker-16/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dispose v0.4.0
[INFO] [stderr]   Downloaded dispose-derive v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bf99e27bf4a352724f3aa4a9a7ad0e82fa29bf587d00a641b29014e905b87011
[INFO] running `Command { std: "docker" "start" "-a" "bf99e27bf4a352724f3aa4a9a7ad0e82fa29bf587d00a641b29014e905b87011", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bf99e27bf4a352724f3aa4a9a7ad0e82fa29bf587d00a641b29014e905b87011", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf99e27bf4a352724f3aa4a9a7ad0e82fa29bf587d00a641b29014e905b87011", kill_on_drop: false }`
[INFO] [stdout] bf99e27bf4a352724f3aa4a9a7ad0e82fa29bf587d00a641b29014e905b87011
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b3b83b069efad3061b35cfd38b410fe260c72eaab52bd941bb03d4abe8924ed7
[INFO] running `Command { std: "docker" "start" "-a" "b3b83b069efad3061b35cfd38b410fe260c72eaab52bd941bb03d4abe8924ed7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling crossbeam-utils v0.8.7
[INFO] [stderr]    Compiling crossbeam-queue v0.3.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling dispose-derive v0.3.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.7
[INFO] [stderr]    Compiling crossbeam-channel v0.5.2
[INFO] [stderr]    Compiling crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling crossbeam v0.8.1
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling dispose v0.4.0
[INFO] [stderr]    Compiling topograph v0.3.1-alpha.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(generic_associated_types)]
[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 `topograph` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "b3b83b069efad3061b35cfd38b410fe260c72eaab52bd941bb03d4abe8924ed7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3b83b069efad3061b35cfd38b410fe260c72eaab52bd941bb03d4abe8924ed7", kill_on_drop: false }`
[INFO] [stdout] b3b83b069efad3061b35cfd38b410fe260c72eaab52bd941bb03d4abe8924ed7