[INFO] fetching crate cshannon 0.1.1...
[INFO] documenting cshannon-0.1.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate cshannon 0.1.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate cshannon 0.1.1 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cshannon 0.1.1
[INFO] finished tweaking crates.io crate cshannon 0.1.1
[INFO] tweaked toml for crates.io crate cshannon 0.1.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate cshannon 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 52842feb82b2d547a1a826499bc4abaff0eb2cb82853154e96fb6c43fd5d9722
[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" "52842feb82b2d547a1a826499bc4abaff0eb2cb82853154e96fb6c43fd5d9722", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "52842feb82b2d547a1a826499bc4abaff0eb2cb82853154e96fb6c43fd5d9722", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52842feb82b2d547a1a826499bc4abaff0eb2cb82853154e96fb6c43fd5d9722", kill_on_drop: false }`
[INFO] [stdout] 52842feb82b2d547a1a826499bc4abaff0eb2cb82853154e96fb6c43fd5d9722
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d86f96c31a343dad740b0622fb0e6fcb35c0c11c625f06750c8e118c9c8dfdf7
[INFO] running `Command { std: "docker" "start" "-a" "d86f96c31a343dad740b0622fb0e6fcb35c0c11c625f06750c8e118c9c8dfdf7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling anyhow v1.0.28
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking bit-vec v0.6.1
[INFO] [stderr]     Checking test_bin v0.3.0
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]  Documenting cshannon v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(associated_type_bounds)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(seek_convenience)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(test)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `cshannon`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name cshannon 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 anyhow=/opt/rustwide/target/debug/deps/libanyhow-8f6ce0f93ec1bcae.rmeta --extern bit_vec=/opt/rustwide/target/debug/deps/libbit_vec-bbb1bc601bffad4b.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-640f3f0b10064291.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-8abae8cb76eed13d.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-ab30e06b03b71c4d.rmeta --extern owning_ref=/opt/rustwide/target/debug/deps/libowning_ref-a654e99bbd38a188.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-76249a140ef4450c.rmeta --extern test_bin=/opt/rustwide/target/debug/deps/libtest_bin-8676c1b24d8de6d2.rmeta --extern unicode_segmentation=/opt/rustwide/target/debug/deps/libunicode_segmentation-28fbb19158b00394.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d86f96c31a343dad740b0622fb0e6fcb35c0c11c625f06750c8e118c9c8dfdf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d86f96c31a343dad740b0622fb0e6fcb35c0c11c625f06750c8e118c9c8dfdf7", kill_on_drop: false }`
[INFO] [stdout] d86f96c31a343dad740b0622fb0e6fcb35c0c11c625f06750c8e118c9c8dfdf7