[INFO] fetching crate relp 0.2.4...
[INFO] documenting relp-0.2.4 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate relp 0.2.4 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate relp 0.2.4 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate relp 0.2.4
[INFO] finished tweaking crates.io crate relp 0.2.4
[INFO] tweaked toml for crates.io crate relp 0.2.4 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate relp 0.2.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded enum-map-derive v0.11.0
[INFO] [stderr]   Downloaded daggy v0.8.0
[INFO] [stderr]   Downloaded gcd v2.2.0
[INFO] [stderr]   Downloaded enum-map v2.4.2
[INFO] [stderr]   Downloaded relp-num v0.1.11
[INFO] [stderr]   Downloaded cumsum v1.0.0
[INFO] [stderr]   Downloaded fifo-set v1.0.0
[INFO] [stderr]   Downloaded index-utils v2.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6cd4fc4e0a866c96afdf900b5b78ca1f5d874be66a80cd42452a42b7a4673ea3
[INFO] running `Command { std: "docker" "start" "-a" "6cd4fc4e0a866c96afdf900b5b78ca1f5d874be66a80cd42452a42b7a4673ea3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6cd4fc4e0a866c96afdf900b5b78ca1f5d874be66a80cd42452a42b7a4673ea3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cd4fc4e0a866c96afdf900b5b78ca1f5d874be66a80cd42452a42b7a4673ea3", kill_on_drop: false }`
[INFO] [stdout] 6cd4fc4e0a866c96afdf900b5b78ca1f5d874be66a80cd42452a42b7a4673ea3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1969c03263c82042f37abe14c61e3cac40c4acf82d284697d3ddf47381d6afda
[INFO] running `Command { std: "docker" "start" "-a" "1969c03263c82042f37abe14c61e3cac40c4acf82d284697d3ddf47381d6afda", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling cc v1.0.78
[INFO] [stderr]     Checking fixedbitset v0.4.2
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]     Checking gcd v2.2.0
[INFO] [stderr]     Checking fifo-set v1.0.0
[INFO] [stderr]     Checking cumsum v1.0.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/smallvec-1.10.0/src/lib.rs:82:41
[INFO] [stdout]    |
[INFO] [stdout] 82 | #![cfg_attr(feature = "specialization", feature(specialization))]
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `smallvec` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1969c03263c82042f37abe14c61e3cac40c4acf82d284697d3ddf47381d6afda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1969c03263c82042f37abe14c61e3cac40c4acf82d284697d3ddf47381d6afda", kill_on_drop: false }`
[INFO] [stdout] 1969c03263c82042f37abe14c61e3cac40c4acf82d284697d3ddf47381d6afda
