[INFO] fetching crate cpclib-sna 0.4.2-alpha...
[INFO] documenting cpclib-sna-0.4.2-alpha against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate cpclib-sna 0.4.2-alpha into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate cpclib-sna 0.4.2-alpha 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 cpclib-sna 0.4.2-alpha
[INFO] finished tweaking crates.io crate cpclib-sna 0.4.2-alpha
[INFO] tweaked toml for crates.io crate cpclib-sna 0.4.2-alpha written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate cpclib-sna 0.4.2-alpha 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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] c49f6f82396ab64bf370ede1808651b51165b9ad034407edce4c380a728987fa
[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" "c49f6f82396ab64bf370ede1808651b51165b9ad034407edce4c380a728987fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c49f6f82396ab64bf370ede1808651b51165b9ad034407edce4c380a728987fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c49f6f82396ab64bf370ede1808651b51165b9ad034407edce4c380a728987fa", kill_on_drop: false }`
[INFO] [stdout] c49f6f82396ab64bf370ede1808651b51165b9ad034407edce4c380a728987fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 78b7192aa30e58584886f53d4fdee32479edda4d8a7685336ad425ce7c9e41e6
[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" "78b7192aa30e58584886f53d4fdee32479edda4d8a7685336ad425ce7c9e41e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling tinyvec v0.3.3
[INFO] [stderr]     Checking bitsets v0.1.1
[INFO] [stderr]     Checking smallvec v1.4.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling unicode-normalization v0.1.13
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling chrono v0.4.12
[INFO] [stderr]    Compiling url v2.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling toml v0.5.6
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling cargo-lock v4.0.1
[INFO] [stderr]    Compiling proc-macro-crate v0.1.4
[INFO] [stderr]    Compiling num_enum_derive v0.4.3
[INFO] [stderr]    Compiling built v0.4.2
[INFO] [stderr]     Checking num_enum v0.4.3
[INFO] [stderr]    Compiling cpclib-sna v0.4.2-alpha (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting cpclib-sna v0.4.2-alpha (/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(vec_drain_as_slice)]
[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 `cpclib-sna`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name cpclib_sna 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 bitflags=/opt/rustwide/target/debug/deps/libbitflags-e1a9b9121eac1683.rmeta --extern bitsets=/opt/rustwide/target/debug/deps/libbitsets-1e6cabc384a1a3da.rmeta --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-b31c81520e08f43a.rmeta --extern matches=/opt/rustwide/target/debug/deps/libmatches-54ad82543365efe0.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-35f76876d7cb916f.rmeta --extern num_enum=/opt/rustwide/target/debug/deps/libnum_enum-64fbd1f7ce96124b.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-b00201ae098c0c4f.rmeta --extern smallvec=/opt/rustwide/target/debug/deps/libsmallvec-cffcbd4b322ec378.rmeta --extern strsim=/opt/rustwide/target/debug/deps/libstrsim-ba01cc70d4268486.rmeta --cap-lints=warn --crate-version 0.4.2-alpha` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "78b7192aa30e58584886f53d4fdee32479edda4d8a7685336ad425ce7c9e41e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78b7192aa30e58584886f53d4fdee32479edda4d8a7685336ad425ce7c9e41e6", kill_on_drop: false }`
[INFO] [stdout] 78b7192aa30e58584886f53d4fdee32479edda4d8a7685336ad425ce7c9e41e6