[INFO] fetching crate dill 0.2.0...
[INFO] documenting dill-0.2.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate dill 0.2.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate dill 0.2.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1/source/rust-toolchain
[INFO] started tweaking crates.io crate dill 0.2.0
[INFO] finished tweaking crates.io crate dill 0.2.0
[INFO] tweaked toml for crates.io crate dill 0.2.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b00918e8bc91e2dbc95e14747e5c9d59e3527171fec10cf4a57c52e5d6d2c13
[INFO] running `Command { std: "docker" "start" "-a" "0b00918e8bc91e2dbc95e14747e5c9d59e3527171fec10cf4a57c52e5d6d2c13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b00918e8bc91e2dbc95e14747e5c9d59e3527171fec10cf4a57c52e5d6d2c13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b00918e8bc91e2dbc95e14747e5c9d59e3527171fec10cf4a57c52e5d6d2c13", kill_on_drop: false }`
[INFO] [stdout] 0b00918e8bc91e2dbc95e14747e5c9d59e3527171fec10cf4a57c52e5d6d2c13
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 94cdb70ff9686e45ddf318a7ccb62bb175269c8214f242faeab5f187b8d3b2b4
[INFO] running `Command { std: "docker" "start" "-a" "94cdb70ff9686e45ddf318a7ccb62bb175269c8214f242faeab5f187b8d3b2b4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]     Checking multimap v0.8.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]    Compiling darling_core v0.13.0
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]    Compiling darling_macro v0.13.0
[INFO] [stderr]    Compiling darling v0.13.0
[INFO] [stderr]    Compiling dill-impl v0.2.0
[INFO] [stderr]  Documenting dill v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(unsize)]
[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 `dill`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name dill 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 dill_impl=/opt/rustwide/target/debug/deps/libdill_impl-8893004fbe65cb03.so --extern multimap=/opt/rustwide/target/debug/deps/libmultimap-9732bc86105f4e7d.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-8aa92da420a12172.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "94cdb70ff9686e45ddf318a7ccb62bb175269c8214f242faeab5f187b8d3b2b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94cdb70ff9686e45ddf318a7ccb62bb175269c8214f242faeab5f187b8d3b2b4", kill_on_drop: false }`
[INFO] [stdout] 94cdb70ff9686e45ddf318a7ccb62bb175269c8214f242faeab5f187b8d3b2b4
