[INFO] fetching crate byml 0.1.0...
[INFO] documenting byml-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate byml 0.1.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate byml 0.1.0 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 crates.io crate byml 0.1.0
[INFO] finished tweaking crates.io crate byml 0.1.0
[INFO] tweaked toml for crates.io crate byml 0.1.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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 binwrite_derive v0.2.1
[INFO] [stderr]   Downloaded parse_int v0.4.0
[INFO] [stderr]   Downloaded binread_derive v1.1.0
[INFO] [stderr]   Downloaded binread v1.1.1
[INFO] [stderr]   Downloaded yaz0 v0.1.2
[INFO] [stderr]   Downloaded binwrite v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] b61176a712829137fa7cb721f43b50b319eb77bdb4aaaea006efecaa25227fbb
[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" "b61176a712829137fa7cb721f43b50b319eb77bdb4aaaea006efecaa25227fbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b61176a712829137fa7cb721f43b50b319eb77bdb4aaaea006efecaa25227fbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b61176a712829137fa7cb721f43b50b319eb77bdb4aaaea006efecaa25227fbb", kill_on_drop: false }`
[INFO] [stdout] b61176a712829137fa7cb721f43b50b319eb77bdb4aaaea006efecaa25227fbb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] fcdab81974b4f55ca21fd2213f9951a99982fc3fb6967281705f2187bb71f1fc
[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" "fcdab81974b4f55ca21fd2213f9951a99982fc3fb6967281705f2187bb71f1fc", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]     Checking yaz0 v0.1.2
[INFO] [stderr]     Checking parse_int v0.4.0
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]    Compiling binread_derive v1.1.0
[INFO] [stderr]    Compiling binwrite_derive v0.2.1
[INFO] [stderr]     Checking binwrite v0.2.1
[INFO] [stderr]     Checking binread v1.1.1
[INFO] [stderr]  Documenting byml v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(seek_convenience)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[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 `byml`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name byml src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-301ff4ddca327bfb.rmeta --extern binread=/opt/rustwide/target/debug/deps/libbinread-59fb90dfb4799d66.rmeta --extern binwrite=/opt/rustwide/target/debug/deps/libbinwrite-5dbce1dfd7eb1ec6.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-364c148656283980.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-1a7a9a0db5c92fc6.rmeta --extern parse_int=/opt/rustwide/target/debug/deps/libparse_int-7f34af6f46ce1e56.rmeta --extern yaz0=/opt/rustwide/target/debug/deps/libyaz0-755eca6dbcd599c6.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "fcdab81974b4f55ca21fd2213f9951a99982fc3fb6967281705f2187bb71f1fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fcdab81974b4f55ca21fd2213f9951a99982fc3fb6967281705f2187bb71f1fc", kill_on_drop: false }`
[INFO] [stdout] fcdab81974b4f55ca21fd2213f9951a99982fc3fb6967281705f2187bb71f1fc