[INFO] cloning repository https://github.com/Prior99/midi-strip-client
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Prior99/midi-strip-client" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrior99%2Fmidi-strip-client", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrior99%2Fmidi-strip-client'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd45132afabc5d94ba58156aff3e2b7e1b41cebc
[INFO] documenting Prior99/midi-strip-client 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%2FPrior99%2Fmidi-strip-client" "/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/Prior99/midi-strip-client 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/Prior99/midi-strip-client
[INFO] finished tweaking git repo https://github.com/Prior99/midi-strip-client
[INFO] tweaked toml for git repo https://github.com/Prior99/midi-strip-client written to /workspace/builds/worker-31/source/Cargo.toml
[INFO] crate git repo https://github.com/Prior99/midi-strip-client 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bitflags v0.3.3
[INFO] [stderr]   Downloaded coremidi-sys v2.0.2
[INFO] [stderr]   Downloaded coremidi v0.3.0
[INFO] [stderr]   Downloaded memalloc v0.1.0
[INFO] [stderr]   Downloaded alsa v0.2.1
[INFO] [stderr]   Downloaded hsl v0.1.1
[INFO] [stderr]   Downloaded nix v0.9.0
[INFO] [stderr]   Downloaded phf_codegen v0.7.23
[INFO] [stderr]   Downloaded phf_generator v0.7.23
[INFO] [stderr]   Downloaded winmm-sys v0.2.0
[INFO] [stderr]   Downloaded midir v0.5.0
[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] 497ed01fe35d17a71349e9eb4a9659c760e327bd406b0ae7381978f5d6dc8eca
[INFO] running `Command { std: "docker" "start" "-a" "497ed01fe35d17a71349e9eb4a9659c760e327bd406b0ae7381978f5d6dc8eca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "497ed01fe35d17a71349e9eb4a9659c760e327bd406b0ae7381978f5d6dc8eca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "497ed01fe35d17a71349e9eb4a9659c760e327bd406b0ae7381978f5d6dc8eca", kill_on_drop: false }`
[INFO] [stdout] 497ed01fe35d17a71349e9eb4a9659c760e327bd406b0ae7381978f5d6dc8eca
[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] 97db9755b11985ea1a75cfbdc601678daec8ceec8be9155f1cdc31ad72398b2b
[INFO] running `Command { std: "docker" "start" "-a" "97db9755b11985ea1a75cfbdc601678daec8ceec8be9155f1cdc31ad72398b2b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]    Compiling proc-macro2 v0.4.19
[INFO] [stderr]    Compiling rand_core v0.2.1
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking byteorder v1.2.6
[INFO] [stderr]     Checking lazycell v1.2.0
[INFO] [stderr]    Compiling httparse v1.3.3
[INFO] [stderr]     Checking unicode-normalization v0.1.7
[INFO] [stderr]    Compiling serde v1.0.79
[INFO] [stderr]    Compiling ryu v0.2.6
[INFO] [stderr]     Checking bitflags v0.9.1
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking slab v0.4.1
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking approx v0.1.1
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking memalloc v0.1.0
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]     Checking bitflags v0.3.3
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]     Checking hsl v0.1.1
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]    Compiling phf_shared v0.7.23
[INFO] [stderr]     Checking log v0.4.5
[INFO] [stderr]    Compiling rand v0.5.5
[INFO] [stderr]     Checking phf v0.7.23
[INFO] [stderr]     Checking term v0.5.1
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking nix v0.9.0
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking rand v0.4.3
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]    Compiling alsa-sys v0.1.2
[INFO] [stderr]     Checking bytes v0.4.10
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling phf_generator v0.7.23
[INFO] [stderr]     Checking url v1.7.1
[INFO] [stderr]     Checking mio-extras v2.0.5
[INFO] [stderr]     Checking alsa v0.2.1
[INFO] [stderr]     Checking serde_json v1.0.31
[INFO] [stderr]    Compiling phf_codegen v0.7.23
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling syn v0.15.6
[INFO] [stderr]    Compiling palette v0.4.1
[INFO] [stderr]     Checking ws v0.7.8
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking midir v0.5.0
[INFO] [stderr]     Checking simplelog v0.5.2
[INFO] [stderr]    Compiling serde_derive v1.0.79
[INFO] [stderr]    Compiling palette_derive v0.4.1
[INFO] [stderr]  Documenting midi-strip-client v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(duration_as_u128)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `midi-strip-client`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name midi_strip_client src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f48fd39f77f1a8d1 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-a9c198513e1e316b.rmeta --extern hsl=/opt/rustwide/target/debug/deps/libhsl-b83cdad95d2eb5ff.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-74ffdf9e9f14dc0a.rmeta --extern midir=/opt/rustwide/target/debug/deps/libmidir-c23ea15afcdf4f02.rmeta --extern palette=/opt/rustwide/target/debug/deps/libpalette-7ca7e51da786037d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-46b4dfcdb3c4bdd7.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-3992f8264e60a7e9.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-219344e9a1cda466.rmeta --extern simplelog=/opt/rustwide/target/debug/deps/libsimplelog-3f9c68ddd468796d.rmeta --extern ws=/opt/rustwide/target/debug/deps/libws-df9c613ba8b52234.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "97db9755b11985ea1a75cfbdc601678daec8ceec8be9155f1cdc31ad72398b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97db9755b11985ea1a75cfbdc601678daec8ceec8be9155f1cdc31ad72398b2b", kill_on_drop: false }`
[INFO] [stdout] 97db9755b11985ea1a75cfbdc601678daec8ceec8be9155f1cdc31ad72398b2b