[INFO] cloning repository https://github.com/wycats/rust-experiments
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wycats/rust-experiments" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwycats%2Frust-experiments", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwycats%2Frust-experiments'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f8131dca1d6bc656a2e549fb0159619c9485c853
[INFO] documenting wycats/rust-experiments against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwycats%2Frust-experiments" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wycats/rust-experiments on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-15/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-15/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/wycats/rust-experiments
[INFO] finished tweaking git repo https://github.com/wycats/rust-experiments
[INFO] tweaked toml for git repo https://github.com/wycats/rust-experiments written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/wycats/rust-experiments already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ctor v0.1.16
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b5d1da4750d62ca035a97d08a496f65fe6444c1a05c9c80344971a939976e69d
[INFO] running `Command { std: "docker" "start" "-a" "b5d1da4750d62ca035a97d08a496f65fe6444c1a05c9c80344971a939976e69d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5d1da4750d62ca035a97d08a496f65fe6444c1a05c9c80344971a939976e69d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5d1da4750d62ca035a97d08a496f65fe6444c1a05c9c80344971a939976e69d", kill_on_drop: false }`
[INFO] [stdout] b5d1da4750d62ca035a97d08a496f65fe6444c1a05c9c80344971a939976e69d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eaf8473683c113ba446971c86742db33b74558d8c9e0a599c658125b472f9511
[INFO] running `Command { std: "docker" "start" "-a" "eaf8473683c113ba446971c86742db33b74558d8c9e0a599c658125b472f9511", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling regex-syntax v0.6.18
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking smallvec v1.5.0
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]     Checking typed-arena v2.0.1
[INFO] [stderr]     Checking format-core v0.2.3
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling quick-error v2.0.0
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]     Checking bimap v0.5.3
[INFO] [stderr]     Checking dissimilar v1.0.2
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking humantime v2.0.1
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking pretty v0.10.0
[INFO] [stderr]    Compiling derefable v0.1.0
[INFO] [stderr]    Compiling regex v1.3.9
[INFO] [stderr]     Checking parking_lot_core v0.8.0
[INFO] [stderr]     Checking terminal_size v0.1.13
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling rental-impl v0.5.5
[INFO] [stderr]    Compiling pin-project-internal v1.0.2
[INFO] [stderr]    Compiling modular-bitfield-impl v0.11.2
[INFO] [stderr]    Compiling format-macro v0.2.3
[INFO] [stderr]    Compiling derive-new v0.5.8
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking console v0.13.0
[INFO] [stderr]     Checking type-map v0.3.0
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling getset v0.1.1
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking format v0.2.3
[INFO] [stderr]    Compiling ouroboros_macro v0.5.1
[INFO] [stderr]     Checking modular-bitfield v0.11.2
[INFO] [stderr]     Checking pin-project v1.0.2
[INFO] [stderr]     Checking ouroboros v0.5.1
[INFO] [stderr]     Checking rental v0.5.5
[INFO] [stderr]     Checking spectrum v0.0.0 (/opt/rustwide/workdir/crates/spectrum)
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> crates/spectrum/src/emit/style.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 |   #[repr(u8)]
[INFO] [stdout]    |  _^^
[INFO] [stdout] 11 | | #[derive(Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash, Debug, Default)]
[INFO] [stdout] 12 | | pub struct Attributes {
[INFO] [stdout] 13 | |     bold: bool,
[INFO] [stdout] ...  |
[INFO] [stdout] 19 | |     hidden: bool,
[INFO] [stdout] 20 | |     #[skip]
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 10 - #[repr(u8)]
[INFO] [stdout] 10 + #[skip]
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> crates/spectrum/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_pin)]
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `spectrum` due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "eaf8473683c113ba446971c86742db33b74558d8c9e0a599c658125b472f9511", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eaf8473683c113ba446971c86742db33b74558d8c9e0a599c658125b472f9511", kill_on_drop: false }`
[INFO] [stdout] eaf8473683c113ba446971c86742db33b74558d8c9e0a599c658125b472f9511