[INFO] cloning repository https://github.com/ArdusJax/dart-frog
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ArdusJax/dart-frog" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArdusJax%2Fdart-frog", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArdusJax%2Fdart-frog'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b232422671d4fde470d1c1b4418ef3c8b86d4264
[INFO] documenting ArdusJax/dart-frog 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%2FArdusJax%2Fdart-frog" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ArdusJax/dart-frog 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/ArdusJax/dart-frog
[INFO] finished tweaking git repo https://github.com/ArdusJax/dart-frog
[INFO] tweaked toml for git repo https://github.com/ArdusJax/dart-frog written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/ArdusJax/dart-frog 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-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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 66d4ca4fcf4daed69e2686c8d394bbfd34d8d8266de177aa9bfdc857fa47350a
[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" "66d4ca4fcf4daed69e2686c8d394bbfd34d8d8266de177aa9bfdc857fa47350a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "66d4ca4fcf4daed69e2686c8d394bbfd34d8d8266de177aa9bfdc857fa47350a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66d4ca4fcf4daed69e2686c8d394bbfd34d8d8266de177aa9bfdc857fa47350a", kill_on_drop: false }`
[INFO] [stdout] 66d4ca4fcf4daed69e2686c8d394bbfd34d8d8266de177aa9bfdc857fa47350a
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 857cd64dd9d34c80f294bc165509f0bac2cf29b51bd95b97104f6eb4871f531e
[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" "857cd64dd9d34c80f294bc165509f0bac2cf29b51bd95b97104f6eb4871f531e", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]     Checking ucd-util v0.1.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.19
[INFO] [stderr]     Checking rand_core v0.2.1
[INFO] [stderr]     Checking utf8-ranges v1.0.1
[INFO] [stderr]    Compiling serde v1.0.78
[INFO] [stderr]    Compiling regex v1.0.5
[INFO] [stderr]     Checking linked-hash-map v0.5.1
[INFO] [stderr]     Checking unindent v0.1.3
[INFO] [stderr]     Checking memchr v2.0.2
[INFO] [stderr]     Checking termios v0.3.0
[INFO] [stderr]     Checking clicolors-control v0.2.0
[INFO] [stderr]     Checking lock_api v0.1.3
[INFO] [stderr]     Checking smallvec v0.6.5
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking regex-syntax v0.6.2
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking aho-corasick v0.6.8
[INFO] [stderr]     Checking yaml-rust v0.4.0
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking colored v1.6.1
[INFO] [stderr]    Compiling syn v0.15.4
[INFO] [stderr]     Checking parking_lot_core v0.3.1
[INFO] [stderr]     Checking parking_lot v0.6.4
[INFO] [stderr]     Checking regex v0.2.11
[INFO] [stderr]     Checking console v0.6.2
[INFO] [stderr]     Checking indicatif v0.9.0
[INFO] [stderr]    Compiling serde_derive v1.0.78
[INFO] [stderr]     Checking serde_yaml v0.7.5
[INFO] [stderr]     Checking serde_json v1.0.27
[INFO] [stderr]  Documenting dart-frog v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(custom_attribute)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in favor of `#![register_tool]` and `#![register_attr]`
[INFO] [stdout] 
[INFO] [stdout] 
[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(custom_attribute)]
[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] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `dart-frog`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name dart_frog 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 clap=/opt/rustwide/target/debug/deps/libclap-3a84ce998ee1d768.rmeta --extern colored=/opt/rustwide/target/debug/deps/libcolored-ff9017201a5b4e88.rmeta --extern indicatif=/opt/rustwide/target/debug/deps/libindicatif-a723f136095f7a7e.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-6667279d622019c7.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-c5f464f2a114f8da.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-0213c4d3f3b652cb.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-f7a90c99dbb0646f.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-649f1c97a6493ef5.rmeta --extern unindent=/opt/rustwide/target/debug/deps/libunindent-3fd50d9163e425a6.rmeta --extern yaml_rust=/opt/rustwide/target/debug/deps/libyaml_rust-27f40a7eda7ece99.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "857cd64dd9d34c80f294bc165509f0bac2cf29b51bd95b97104f6eb4871f531e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "857cd64dd9d34c80f294bc165509f0bac2cf29b51bd95b97104f6eb4871f531e", kill_on_drop: false }`
[INFO] [stdout] 857cd64dd9d34c80f294bc165509f0bac2cf29b51bd95b97104f6eb4871f531e