[INFO] fetching crate json-ld 0.2.0-alpha...
[INFO] documenting json-ld-0.2.0-alpha against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate json-ld 0.2.0-alpha into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate json-ld 0.2.0-alpha 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] started tweaking crates.io crate json-ld 0.2.0-alpha
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate json-ld 0.2.0-alpha
[INFO] tweaked toml for crates.io crate json-ld 0.2.0-alpha written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate json-ld 0.2.0-alpha already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] fd0d577c91e3c5e82f4452d13fbef043f374e7cecdaf6b109fb39928dcd37476
[INFO] running `Command { std: "docker" "start" "-a" "fd0d577c91e3c5e82f4452d13fbef043f374e7cecdaf6b109fb39928dcd37476", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd0d577c91e3c5e82f4452d13fbef043f374e7cecdaf6b109fb39928dcd37476", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd0d577c91e3c5e82f4452d13fbef043f374e7cecdaf6b109fb39928dcd37476", kill_on_drop: false }`
[INFO] [stdout] fd0d577c91e3c5e82f4452d13fbef043f374e7cecdaf6b109fb39928dcd37476
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] a023e842a50ef6f81cd8c592ae13d0da26065d6be243dd0898d939813b6281db
[INFO] running `Command { std: "docker" "start" "-a" "a023e842a50ef6f81cd8c592ae13d0da26065d6be243dd0898d939813b6281db", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling proc-macro-nested v0.1.4
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]     Checking futures-io v0.3.4
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking pct-str v1.0.2
[INFO] [stderr]     Checking mown v0.2.0
[INFO] [stderr]     Checking json v0.12.3
[INFO] [stderr]     Checking memchr v2.3.3
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]     Checking iref v1.1.5
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling proc-macro-hack v0.5.12
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]  Documenting json-ld v0.2.0-alpha (/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(str_strip)]
[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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(arbitrary_self_types)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `json-ld`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name json_ld 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 futures=/opt/rustwide/target/debug/deps/libfutures-041f11747e9666e7.rmeta --extern iref=/opt/rustwide/target/debug/deps/libiref-d2709e5bcb815ba0.rmeta --extern json=/opt/rustwide/target/debug/deps/libjson-861a745f89bbbaf2.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-b09ad02db399754e.rmeta --extern mown=/opt/rustwide/target/debug/deps/libmown-0c467f34e495a4cc.rmeta --cap-lints=warn --crate-version 0.2.0-alpha` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a023e842a50ef6f81cd8c592ae13d0da26065d6be243dd0898d939813b6281db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a023e842a50ef6f81cd8c592ae13d0da26065d6be243dd0898d939813b6281db", kill_on_drop: false }`
[INFO] [stdout] a023e842a50ef6f81cd8c592ae13d0da26065d6be243dd0898d939813b6281db
