[INFO] fetching crate brioche 0.0.0...
[INFO] documenting brioche-0.0.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate brioche 0.0.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate brioche 0.0.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate brioche 0.0.0
[INFO] finished tweaking crates.io crate brioche 0.0.0
[INFO] tweaked toml for crates.io crate brioche 0.0.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate brioche 0.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e0ff1e3d0ee02a98f032a4541a9d7c2b4856214e60ab7d6171b926133dde3b8
[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" "6e0ff1e3d0ee02a98f032a4541a9d7c2b4856214e60ab7d6171b926133dde3b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e0ff1e3d0ee02a98f032a4541a9d7c2b4856214e60ab7d6171b926133dde3b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e0ff1e3d0ee02a98f032a4541a9d7c2b4856214e60ab7d6171b926133dde3b8", kill_on_drop: false }`
[INFO] [stdout] 6e0ff1e3d0ee02a98f032a4541a9d7c2b4856214e60ab7d6171b926133dde3b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a4c78b561681fa4922040413d6190ebf896202485511b2c357a13648e6609029
[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" "a4c78b561681fa4922040413d6190ebf896202485511b2c357a13648e6609029", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling syn v1.0.15
[INFO] [stderr]    Compiling rustversion v1.0.2
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]     Checking cesu8 v1.1.0
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling brioche-ducc-sys v0.1.2-brioche
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking brioche-ducc v0.1.2-brioche
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling proc-macro-error v0.4.9
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.9
[INFO] [stderr]    Compiling err-derive v0.2.2
[INFO] [stderr]    Compiling structopt-derive v0.4.2
[INFO] [stderr]     Checking structopt v0.3.9
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking brioche-ducc-serde v0.1.2-brioche
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]  Documenting brioche v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(inner_deref)]
[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 `brioche`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name brioche 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 ducc=/opt/rustwide/target/debug/deps/libbrioche_ducc-630a1b6fb0fddec4.rmeta --extern ducc_serde=/opt/rustwide/target/debug/deps/libbrioche_ducc_serde-d9483fe7d3ac0177.rmeta --extern err_derive=/opt/rustwide/target/debug/deps/liberr_derive-aa4560bd6a9681ce.so --extern serde=/opt/rustwide/target/debug/deps/libserde-a89b0fe2995e5453.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-8c4ea343757fffaa.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-7a82994a8e472847.rmeta --cap-lints=warn --crate-version 0.0.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "a4c78b561681fa4922040413d6190ebf896202485511b2c357a13648e6609029", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4c78b561681fa4922040413d6190ebf896202485511b2c357a13648e6609029", kill_on_drop: false }`
[INFO] [stdout] a4c78b561681fa4922040413d6190ebf896202485511b2c357a13648e6609029
