[INFO] cloning repository https://github.com/MrCHB1/UniMIDI-in-Rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MrCHB1/UniMIDI-in-Rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrCHB1%2FUniMIDI-in-Rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrCHB1%2FUniMIDI-in-Rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dc6d86b17327726019fa8808312bd07b25d5d63a
[INFO] testing MrCHB1/UniMIDI-in-Rust against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrCHB1%2FUniMIDI-in-Rust" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MrCHB1/UniMIDI-in-Rust on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MrCHB1/UniMIDI-in-Rust
[INFO] finished tweaking git repo https://github.com/MrCHB1/UniMIDI-in-Rust
[INFO] tweaked toml for git repo https://github.com/MrCHB1/UniMIDI-in-Rust written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/MrCHB1/UniMIDI-in-Rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Updating git repository `https://github.com/arduano/kdmapi`
[INFO] [stderr]     Updating git repository `https://github.com/arduano/midi-toolkit-rs`
[INFO] [stderr]     Updating git repository `https://github.com/alexheretic/spin-sleep`
[INFO] [stderr]     Updating git repository `https://github.com/ellisonch/rust-stopwatch.git`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded gen-iter v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 170f42aad79f74010e47014272139bac26f241d3432f8c051390c2c8f7d617d3
[INFO] running `Command { std: "docker" "start" "-a" "170f42aad79f74010e47014272139bac26f241d3432f8c051390c2c8f7d617d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "170f42aad79f74010e47014272139bac26f241d3432f8c051390c2c8f7d617d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "170f42aad79f74010e47014272139bac26f241d3432f8c051390c2c8f7d617d3", kill_on_drop: false }`
[INFO] [stdout] 170f42aad79f74010e47014272139bac26f241d3432f8c051390c2c8f7d617d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e8444073b26c2df56b96eeb51ead2dbb7e9c7f8c3bff9ad0bf28f084e014c23d
[INFO] running `Command { std: "docker" "start" "-a" "e8444073b26c2df56b96eeb51ead2dbb7e9c7f8c3bff9ad0bf28f084e014c23d", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling winapi v0.3.9
[INFO] [stderr]    Compiling slab v0.4.6
[INFO] [stderr]    Compiling gen-iter v0.2.0
[INFO] [stderr]    Compiling spin_sleep v1.0.0 (https://github.com/alexheretic/spin-sleep#a68f8a88)
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling lock_api v0.3.4
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling parking_lot_core v0.7.2
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling kdmapi v0.1.0 (https://github.com/arduano/kdmapi#a8013ddd)
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/gen-iter-0.2.0/src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![feature(generators, generator_trait)]
[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 `gen-iter` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e8444073b26c2df56b96eeb51ead2dbb7e9c7f8c3bff9ad0bf28f084e014c23d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8444073b26c2df56b96eeb51ead2dbb7e9c7f8c3bff9ad0bf28f084e014c23d", kill_on_drop: false }`
[INFO] [stdout] e8444073b26c2df56b96eeb51ead2dbb7e9c7f8c3bff9ad0bf28f084e014c23d