[INFO] fetching crate blocked 0.1.0...
[INFO] documenting blocked-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate blocked 0.1.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate blocked 0.1.0 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 blocked 0.1.0
[INFO] finished tweaking crates.io crate blocked 0.1.0
[INFO] tweaked toml for crates.io crate blocked 0.1.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 931231d111d3a0f3131953e52926f0c228299e1bc6d389c9c84492076a0a86ab
[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" "931231d111d3a0f3131953e52926f0c228299e1bc6d389c9c84492076a0a86ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "931231d111d3a0f3131953e52926f0c228299e1bc6d389c9c84492076a0a86ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "931231d111d3a0f3131953e52926f0c228299e1bc6d389c9c84492076a0a86ab", kill_on_drop: false }`
[INFO] [stdout] 931231d111d3a0f3131953e52926f0c228299e1bc6d389c9c84492076a0a86ab
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b6499d49ae23ad0a1d02ff9f03bfdd26f6630865bc9710f3439cd0ee82ebcfd0
[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" "b6499d49ae23ad0a1d02ff9f03bfdd26f6630865bc9710f3439cd0ee82ebcfd0", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.18
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking openssl-probe v0.1.2
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]    Compiling encoding_rs v0.8.24
[INFO] [stderr]     Checking tower-service v0.3.0
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking dtoa v0.4.6
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking ipnet v2.3.0
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking ci-detective v0.1.0
[INFO] [stderr]     Checking tracing-core v0.1.15
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling hashbrown v0.8.2
[INFO] [stderr]    Compiling indexmap v1.5.2
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking memchr v2.3.3
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking tracing v0.1.19
[INFO] [stderr]    Compiling cc v1.0.59
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]    Compiling libz-sys v1.1.1
[INFO] [stderr]    Compiling libssh2-sys v0.2.19
[INFO] [stderr]    Compiling libgit2-sys v0.12.12+1.0.1
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking git2 v0.13.10
[INFO] [stderr]     Checking tokio-tls v0.3.1
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking serde v1.0.115
[INFO] [stderr]     Checking h2 v0.2.6
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking hyper v0.13.7
[INFO] [stderr]     Checking hyper-tls v0.4.3
[INFO] [stderr]     Checking reqwest v0.10.8
[INFO] [stderr]  Documenting blocked v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![feature(proc_macro_diagnostic)]
[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 `blocked`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name blocked 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 ci_detective=/opt/rustwide/target/debug/deps/libci_detective-3570e9ee866492d8.rmeta --extern git2=/opt/rustwide/target/debug/deps/libgit2-2e64c5fdef112914.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-57a7edc7f441d44c.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-17be1714580826fd.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-5103ea9f59ed634c.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-5c89f7dd86788016.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-99af53deeeec9972.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-702f8cfc9cf9be2e.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-762ba2e1e45d868f.rmeta --extern proc_macro --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "b6499d49ae23ad0a1d02ff9f03bfdd26f6630865bc9710f3439cd0ee82ebcfd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6499d49ae23ad0a1d02ff9f03bfdd26f6630865bc9710f3439cd0ee82ebcfd0", kill_on_drop: false }`
[INFO] [stdout] b6499d49ae23ad0a1d02ff9f03bfdd26f6630865bc9710f3439cd0ee82ebcfd0