[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] documenting MrCHB1/UniMIDI-in-Rust against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrCHB1%2FUniMIDI-in-Rust" "/workspace/builds/worker-31/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-31/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MrCHB1/UniMIDI-in-Rust on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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-31/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" "+1.61.0" "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 crossterm v0.16.0
[INFO] [stderr]   Downloaded wfd v0.1.7
[INFO] [stderr]   Downloaded gen-iter v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 86856fb66d497311117dd89c1a0f6d5c29eb608eda10210b3fe876c8bb7be108
[INFO] running `Command { std: "docker" "start" "-a" "86856fb66d497311117dd89c1a0f6d5c29eb608eda10210b3fe876c8bb7be108", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86856fb66d497311117dd89c1a0f6d5c29eb608eda10210b3fe876c8bb7be108", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86856fb66d497311117dd89c1a0f6d5c29eb608eda10210b3fe876c8bb7be108", kill_on_drop: false }`
[INFO] [stdout] 86856fb66d497311117dd89c1a0f6d5c29eb608eda10210b3fe876c8bb7be108
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "RUSTDOCFLAGS=--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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e871717d7957362a7b5974ad5ff113be7245d21fc36bc45040b3cf3e3c189584
[INFO] running `Command { std: "docker" "start" "-a" "e871717d7957362a7b5974ad5ff113be7245d21fc36bc45040b3cf3e3c189584", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling winapi v0.3.9
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]     Checking slab v0.4.6
[INFO] [stderr]    Compiling cc v1.0.70
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]     Checking gen-iter v0.2.0
[INFO] [stderr]     Checking spin_sleep v1.0.0 (https://github.com/alexheretic/spin-sleep#a68f8a88)
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking libloading v0.7.0
[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[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:33:24
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![feature(generators, generator_trait)]
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gen-iter` due to 3 previous errors
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "e871717d7957362a7b5974ad5ff113be7245d21fc36bc45040b3cf3e3c189584", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e871717d7957362a7b5974ad5ff113be7245d21fc36bc45040b3cf3e3c189584", kill_on_drop: false }`
[INFO] [stdout] e871717d7957362a7b5974ad5ff113be7245d21fc36bc45040b3cf3e3c189584