[INFO] cloning repository https://github.com/leo60228/mastocrom
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/leo60228/mastocrom" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleo60228%2Fmastocrom", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleo60228%2Fmastocrom'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9ae1825f26bd8868471ecf5c4a95bd8b44c6d000
[INFO] documenting leo60228/mastocrom against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleo60228%2Fmastocrom" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/leo60228/mastocrom 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 git repo https://github.com/leo60228/mastocrom
[INFO] finished tweaking git repo https://github.com/leo60228/mastocrom
[INFO] tweaked toml for git repo https://github.com/leo60228/mastocrom written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/leo60228/mastocrom 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 00b68ccd9503e5f096a2fe8bfbc044a06c36922141c5aca8faa7f92c7975944f
[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" "00b68ccd9503e5f096a2fe8bfbc044a06c36922141c5aca8faa7f92c7975944f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "00b68ccd9503e5f096a2fe8bfbc044a06c36922141c5aca8faa7f92c7975944f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00b68ccd9503e5f096a2fe8bfbc044a06c36922141c5aca8faa7f92c7975944f", kill_on_drop: false }`
[INFO] [stdout] 00b68ccd9503e5f096a2fe8bfbc044a06c36922141c5aca8faa7f92c7975944f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] de2abc690d59ab1e2afc3155faf373c527b71ef28f11f0773517af89114e63f6
[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" "de2abc690d59ab1e2afc3155faf373c527b71ef28f11f0773517af89114e63f6", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]     Checking once_cell v1.4.0
[INFO] [stderr]    Compiling gimli v0.21.0
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[INFO] [stderr]    Compiling object v0.19.0
[INFO] [stderr]    Compiling openssl v0.10.29
[INFO] [stderr]     Checking fastrand v1.3.3
[INFO] [stderr]     Checking event-listener v2.3.3
[INFO] [stderr]     Checking waker-fn v1.0.0
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[INFO] [stderr]    Compiling either v1.5.3
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[INFO] [stderr]    Compiling ascii v0.9.3
[INFO] [stderr]    Compiling isahc v0.9.7
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking tap-reader v1.0.1
[INFO] [stderr]     Checking shlex v0.1.1
[INFO] [stderr]     Checking lazy_format v1.7.4
[INFO] [stderr]     Checking tracing-core v0.1.13
[INFO] [stderr]    Compiling openssl-src v111.9.0+1.1.1g
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.4+1.41.0
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling curl-sys v0.4.34+curl-7.71.1
[INFO] [stderr]    Compiling generic-array v0.14.3
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[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling rand v0.4.6
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[INFO] [stderr]     Checking want v0.2.0
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[INFO] [stderr]    Compiling combine v3.8.1
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[INFO] [stderr]    Compiling rand v0.6.5
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[INFO] [stderr]     Checking rand_pcg v0.2.1
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[INFO] [stderr]     Checking cookie v0.12.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling phf_generator v0.7.24
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[INFO] [stderr]     Checking aes-gcm v0.6.0
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[INFO] [stderr]    Compiling phf_generator v0.8.0
[INFO] [stderr]    Compiling phf_codegen v0.8.0
[INFO] [stderr]    Compiling string_cache_codegen v0.5.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.67
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.67
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling tracing-attributes v0.1.9
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling html5ever v0.25.1
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.67
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]     Checking time-macros v0.1.0
[INFO] [stderr]    Compiling graphql-parser v0.2.3
[INFO] [stderr]     Checking time v0.2.16
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]    Compiling structopt-derive v0.4.7
[INFO] [stderr]     Checking cookie v0.14.2
[INFO] [stderr]     Checking js-sys v0.3.44
[INFO] [stderr]     Checking tracing v0.1.18
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]     Checking tracing-futures v0.2.4
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking structopt v0.3.14
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[INFO] [stderr]     Checking smol v0.1.18
[INFO] [stderr]     Checking sluice v0.5.2
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking gloo-timers v0.2.1
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking serde_qs v0.6.1
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking string_cache v0.8.0
[INFO] [stderr]     Checking serde_urlencoded v0.5.5
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking serde_qs v0.4.6
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling graphql-introspection-query v0.1.0
[INFO] [stderr]     Checking async-std v1.6.2
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking publicsuffix v1.5.4
[INFO] [stderr]     Checking tungstenite v0.10.1
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling hyper v0.12.35
[INFO] [stderr]     Checking flexi_logger v0.15.2
[INFO] [stderr]     Checking attohttpc v0.13.0
[INFO] [stderr]     Checking cookie_store v0.7.0
[INFO] [stderr]    Compiling cargo_metadata v0.6.4
[INFO] [stderr]    Compiling graphql_client_codegen v0.9.0
[INFO] [stderr]    Compiling markup5ever v0.10.0
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]    Compiling skeptic v0.13.4
[INFO] [stderr]    Compiling elefren v0.22.0
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]     Checking reqwest v0.9.24
[INFO] [stderr]    Compiling graphql_query_derive v0.9.0
[INFO] [stderr]     Checking http-types v2.4.0
[INFO] [stderr]     Checking async-native-tls v0.3.3
[INFO] [stderr]     Checking async-h1 v2.1.2
[INFO] [stderr]     Checking http-client v3.0.0
[INFO] [stderr]     Checking graphql_client v0.9.0
[INFO] [stderr]     Checking surf v2.0.0-alpha.4
[INFO] [stderr]     Checking crom v0.2.0
[INFO] [stderr]  Documenting mastocrom 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type)]
[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 `mastocrom`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name mastocrom 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-8c061b3ea71c2288.rmeta --extern async_std=/opt/rustwide/target/debug/deps/libasync_std-f935a1034ae97958.rmeta --extern attohttpc=/opt/rustwide/target/debug/deps/libattohttpc-db84672828092027.rmeta --extern crom=/opt/rustwide/target/debug/deps/libcrom-b8478f1fd57cd24d.rmeta --extern elefren=/opt/rustwide/target/debug/deps/libelefren-b8bd0b598515fbbf.rmeta --extern flexi_logger=/opt/rustwide/target/debug/deps/libflexi_logger-7757185d10ea5c8d.rmeta --extern graphql_client=/opt/rustwide/target/debug/deps/libgraphql_client-d6324486d9a166e4.rmeta --extern html5ever=/opt/rustwide/target/debug/deps/libhtml5ever-f381b57bb7f54df4.rmeta --extern http_client=/opt/rustwide/target/debug/deps/libhttp_client-15fed84ac8474cb0.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-30a3734f28de156f.rmeta --extern lazy_format=/opt/rustwide/target/debug/deps/liblazy_format-87145b2a3ba19cfb.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-85e430c763becc5d.rmeta --extern openssl=/opt/rustwide/target/debug/deps/libopenssl-d2413792992eecc2.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-320bf0cec545d2c2.rmeta --extern shlex=/opt/rustwide/target/debug/deps/libshlex-abdb41769f400bad.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-f4ac5e47a5771a3f.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-93c759906c2f9139.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "de2abc690d59ab1e2afc3155faf373c527b71ef28f11f0773517af89114e63f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de2abc690d59ab1e2afc3155faf373c527b71ef28f11f0773517af89114e63f6", kill_on_drop: false }`
[INFO] [stdout] de2abc690d59ab1e2afc3155faf373c527b71ef28f11f0773517af89114e63f6