[INFO] fetching crate dusk-poseidon 0.31.0...
[INFO] documenting dusk-poseidon-0.31.0 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate dusk-poseidon 0.31.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate dusk-poseidon 0.31.0 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc1/source/rust-toolchain
[INFO] started tweaking crates.io crate dusk-poseidon 0.31.0
[INFO] finished tweaking crates.io crate dusk-poseidon 0.31.0
[INFO] tweaked toml for crates.io crate dusk-poseidon 0.31.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "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 pairing v0.23.0
[INFO] [stderr]   Downloaded dusk-jubjub v0.13.1
[INFO] [stderr]   Downloaded derive-hex v0.1.2
[INFO] [stderr]   Downloaded dusk-bytes v0.1.7
[INFO] [stderr]   Downloaded msgpacker-derive v0.3.1
[INFO] [stderr]   Downloaded msgpacker v0.4.3
[INFO] [stderr]   Downloaded dusk-hades v0.22.1
[INFO] [stderr]   Downloaded ahash v0.4.8
[INFO] [stderr]   Downloaded dusk-plonk v0.16.0
[INFO] [stderr]   Downloaded dusk-bls12_381 v0.12.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1cd0c28d89ae4bf7d210d7404fca6ab1e78b98d6c2e1714106d8099fe3131665
[INFO] running `Command { std: "docker" "start" "-a" "1cd0c28d89ae4bf7d210d7404fca6ab1e78b98d6c2e1714106d8099fe3131665", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1cd0c28d89ae4bf7d210d7404fca6ab1e78b98d6c2e1714106d8099fe3131665", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1cd0c28d89ae4bf7d210d7404fca6ab1e78b98d6c2e1714106d8099fe3131665", kill_on_drop: false }`
[INFO] [stdout] 1cd0c28d89ae4bf7d210d7404fca6ab1e78b98d6c2e1714106d8099fe3131665
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dba7e2a0ff2e100dcefebf7512cff78c8e8869f2584f9055ff8507bed2cf8649
[INFO] running `Command { std: "docker" "start" "-a" "dba7e2a0ff2e100dcefebf7512cff78c8e8869f2584f9055ff8507bed2cf8649", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]    Compiling radium v0.7.0
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]     Checking wyz v0.5.1
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking funty v2.0.0
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]     Checking subtle v2.5.0
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]     Checking either v1.10.0
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking bitvec v1.0.1
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking ahash v0.4.8
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking keccak v0.1.5
[INFO] [stderr]     Checking miniz_oxide v0.7.2
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking rayon v1.8.1
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking ff v0.13.0
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking group v0.13.0
[INFO] [stderr]     Checking pairing v0.23.0
[INFO] [stderr]    Compiling derive-hex v0.1.2
[INFO] [stderr]     Checking dusk-bytes v0.1.7
[INFO] [stderr]     Checking dusk-bls12_381 v0.12.3
[INFO] [stderr]     Checking dusk-jubjub v0.13.1
[INFO] [stderr]    Compiling zeroize_derive v1.4.2
[INFO] [stderr]    Compiling msgpacker-derive v0.3.1
[INFO] [stderr]     Checking zeroize v1.7.0
[INFO] [stderr]     Checking merlin v3.0.0
[INFO] [stderr]     Checking msgpacker v0.4.3
[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/msgpacker-0.4.3/src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     iter_array_chunks,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/msgpacker-0.4.3/src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     maybe_uninit_array_assume_init,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/msgpacker-0.4.3/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     maybe_uninit_uninit_array
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[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 compile `msgpacker` (lib) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "dba7e2a0ff2e100dcefebf7512cff78c8e8869f2584f9055ff8507bed2cf8649", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dba7e2a0ff2e100dcefebf7512cff78c8e8869f2584f9055ff8507bed2cf8649", kill_on_drop: false }`
[INFO] [stdout] dba7e2a0ff2e100dcefebf7512cff78c8e8869f2584f9055ff8507bed2cf8649
