[INFO] fetching crate os_stat 0.1.0...
[INFO] testing os_stat-0.1.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate os_stat 0.1.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate os_stat 0.1.0 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 crates.io crate os_stat 0.1.0
[INFO] finished tweaking crates.io crate os_stat 0.1.0
[INFO] tweaked toml for crates.io crate os_stat 0.1.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 0c9177af31c40864587628507b953182fdb894506986d817c3ff73fbee9b033e
[INFO] running `Command { std: "docker" "start" "-a" "0c9177af31c40864587628507b953182fdb894506986d817c3ff73fbee9b033e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c9177af31c40864587628507b953182fdb894506986d817c3ff73fbee9b033e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c9177af31c40864587628507b953182fdb894506986d817c3ff73fbee9b033e", kill_on_drop: false }`
[INFO] [stdout] 0c9177af31c40864587628507b953182fdb894506986d817c3ff73fbee9b033e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 8a2ae947b628eae4dca5ca771a5fd55f8cc2d094a7485c6b8395e51e9a61d9fb
[INFO] running `Command { std: "docker" "start" "-a" "8a2ae947b628eae4dca5ca771a5fd55f8cc2d094a7485c6b8395e51e9a61d9fb", kill_on_drop: false }`
[INFO] [stderr]    Compiling os_stat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iterator_fold_self)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `fold_first` found for struct `std::vec::IntoIter` in the current scope
[INFO] [stdout]   --> src/cpu.rs:60:39
[INFO] [stdout]    |
[INFO] [stdout] 60 |         stat.total = vals.into_iter().fold_first(|acc, val| acc + val).unwrap();
[INFO] [stdout]    |                                       ^^^^^^^^^^ method not found in `std::vec::IntoIter<u64>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `os_stat` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "8a2ae947b628eae4dca5ca771a5fd55f8cc2d094a7485c6b8395e51e9a61d9fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a2ae947b628eae4dca5ca771a5fd55f8cc2d094a7485c6b8395e51e9a61d9fb", kill_on_drop: false }`
[INFO] [stdout] 8a2ae947b628eae4dca5ca771a5fd55f8cc2d094a7485c6b8395e51e9a61d9fb