[INFO] cloning repository https://github.com/MrMcEpic/Rust-Monty-Hall
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MrMcEpic/Rust-Monty-Hall" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrMcEpic%2FRust-Monty-Hall", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrMcEpic%2FRust-Monty-Hall'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 102cbd7793ddf4dfbe7f8c644dea1b5070fdb86a
[INFO] testing MrMcEpic/Rust-Monty-Hall against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrMcEpic%2FRust-Monty-Hall" "/workspace/builds/worker-42/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-42/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MrMcEpic/Rust-Monty-Hall on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MrMcEpic/Rust-Monty-Hall
[INFO] finished tweaking git repo https://github.com/MrMcEpic/Rust-Monty-Hall
[INFO] tweaked toml for git repo https://github.com/MrMcEpic/Rust-Monty-Hall written to /workspace/builds/worker-42/source/Cargo.toml
[INFO] crate git repo https://github.com/MrMcEpic/Rust-Monty-Hall already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0bf12c95b5f2145adeda0e3f2b24c720a89aa806555e429f18a79a819a9b9e33
[INFO] running `Command { std: "docker" "start" "-a" "0bf12c95b5f2145adeda0e3f2b24c720a89aa806555e429f18a79a819a9b9e33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0bf12c95b5f2145adeda0e3f2b24c720a89aa806555e429f18a79a819a9b9e33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bf12c95b5f2145adeda0e3f2b24c720a89aa806555e429f18a79a819a9b9e33", kill_on_drop: false }`
[INFO] [stdout] 0bf12c95b5f2145adeda0e3f2b24c720a89aa806555e429f18a79a819a9b9e33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 720fb4f75b5c8fe265aaa0c2f9387ae16156fbb18e8d1c349a510c40badbcdb8
[INFO] running `Command { std: "docker" "start" "-a" "720fb4f75b5c8fe265aaa0c2f9387ae16156fbb18e8d1c349a510c40badbcdb8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]    Compiling ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling c2-chacha v0.2.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling boxes v0.1.0 (/opt/rustwide/workdir/boxes)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> boxes/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_remove_item, drain_filter)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `remove_item` found for struct `Vec<usize>` in the current scope
[INFO] [stdout]   --> boxes/src/lib.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |             options.remove_item(&first_pick.0); //removes their inital box pick from a list of possible boxes
[INFO] [stdout]    |                     ^^^^^^^^^^^ method not found in `Vec<usize>`
[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 `boxes` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "720fb4f75b5c8fe265aaa0c2f9387ae16156fbb18e8d1c349a510c40badbcdb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "720fb4f75b5c8fe265aaa0c2f9387ae16156fbb18e8d1c349a510c40badbcdb8", kill_on_drop: false }`
[INFO] [stdout] 720fb4f75b5c8fe265aaa0c2f9387ae16156fbb18e8d1c349a510c40badbcdb8
