[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 beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrior99%2Fmidi-strip-client" "/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/Prior99/midi-strip-client on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", 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-10/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" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded memalloc v0.1.0
[INFO] [stderr]   Downloaded ws v0.7.8
[INFO] [stderr]   Downloaded hsl v0.1.1
[INFO] [stderr]   Downloaded nix v0.9.0
[INFO] [stderr]   Downloaded syn v0.15.6
[INFO] [stderr]   Downloaded winmm-sys v0.2.0
[INFO] [stderr]   Downloaded coremidi-sys v2.0.2
[INFO] [stderr]   Downloaded serde_json v1.0.31
[INFO] [stderr]   Downloaded midir v0.5.0
[INFO] [stderr]   Downloaded coremidi v0.3.0
[INFO] [stderr]   Downloaded alsa v0.2.1
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd093600aa6a5fd5681037d76640f3974198287e9ec9189e8911e3d41536e148
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fd093600aa6a5fd5681037d76640f3974198287e9ec9189e8911e3d41536e148", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd093600aa6a5fd5681037d76640f3974198287e9ec9189e8911e3d41536e148", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd093600aa6a5fd5681037d76640f3974198287e9ec9189e8911e3d41536e148", kill_on_drop: false }`
[INFO] [stdout] fd093600aa6a5fd5681037d76640f3974198287e9ec9189e8911e3d41536e148
[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" "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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fde4bb11762743e635fc0be517f4080c17841b3a74a79a4b3814467302a08ed0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fde4bb11762743e635fc0be517f4080c17841b3a74a79a4b3814467302a08ed0", kill_on_drop: false }`
[INFO] [stderr]     Checking memalloc v0.1.0
[INFO] [stderr]     Checking hsl v0.1.1
[INFO] [stderr]     Checking term v0.5.1
[INFO] [stderr]     Checking nix v0.9.0
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]    Compiling phf_generator v0.7.23
[INFO] [stderr]    Compiling syn v0.15.6
[INFO] [stderr]    Compiling palette_derive v0.4.1
[INFO] [stderr]    Compiling phf_codegen v0.7.23
[INFO] [stderr]    Compiling palette v0.4.1
[INFO] [stderr]     Checking simplelog v0.5.2
[INFO] [stderr]     Checking mio-extras v2.0.5
[INFO] [stderr]     Checking ws v0.7.8
[INFO] [stderr]     Checking alsa v0.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.79
[INFO] [stderr]     Checking midir v0.5.0
[INFO] [stderr]  Documenting midi-strip-client v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[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 beta release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(duration_as_u128)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-6d15b82fa4c25a1f.rmeta --extern hsl=/opt/rustwide/target/debug/deps/libhsl-3db60adcbb5169c8.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-ea61b432fc6209df.rmeta --extern midir=/opt/rustwide/target/debug/deps/libmidir-050956ff91cfc4df.rmeta --extern palette=/opt/rustwide/target/debug/deps/libpalette-0f2bc4f6b6e3719a.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-33ec0face6d895fe.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-4987d6560af06f0d.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-a846b2050871ad0a.rmeta --extern simplelog=/opt/rustwide/target/debug/deps/libsimplelog-a0bebf75cb645d2e.rmeta --extern ws=/opt/rustwide/target/debug/deps/libws-1549fd05badf43b8.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "fde4bb11762743e635fc0be517f4080c17841b3a74a79a4b3814467302a08ed0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fde4bb11762743e635fc0be517f4080c17841b3a74a79a4b3814467302a08ed0", kill_on_drop: false }`
[INFO] [stdout] fde4bb11762743e635fc0be517f4080c17841b3a74a79a4b3814467302a08ed0