[INFO] fetching crate casperlabs-types 0.6.1...
[INFO] documenting casperlabs-types-0.6.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate casperlabs-types 0.6.1 into /workspace/builds/worker-113/source
[INFO] validating manifest of crates.io crate casperlabs-types 0.6.1 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] started tweaking crates.io crate casperlabs-types 0.6.1
[INFO] finished tweaking crates.io crate casperlabs-types 0.6.1
[INFO] tweaked toml for crates.io crate casperlabs-types 0.6.1 written to /workspace/builds/worker-113/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded version-sync v0.8.1
[INFO] [stderr]   Downloaded semver-parser v0.9.0
[INFO] [stderr]   Downloaded rusty-fork v0.2.2
[INFO] [stderr]   Downloaded proptest v0.9.6
[INFO] [stderr]   Downloaded pulldown-cmark v0.4.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/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] 5150cc966d74eacef5e647287d42d4ac27be8062a8a59863f1bfa8d51c48a76e
[INFO] running `Command { std: "docker" "start" "-a" "5150cc966d74eacef5e647287d42d4ac27be8062a8a59863f1bfa8d51c48a76e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5150cc966d74eacef5e647287d42d4ac27be8062a8a59863f1bfa8d51c48a76e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5150cc966d74eacef5e647287d42d4ac27be8062a8a59863f1bfa8d51c48a76e", kill_on_drop: false }`
[INFO] [stdout] 5150cc966d74eacef5e647287d42d4ac27be8062a8a59863f1bfa8d51c48a76e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/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] 6e1acd7f44e8c4a6e8cd3bcc6fea9e738b1273da49a395b6c241d3dc06a1352e
[INFO] running `Command { std: "docker" "start" "-a" "6e1acd7f44e8c4a6e8cd3bcc6fea9e738b1273da49a395b6c241d3dc06a1352e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]     Checking hex_fmt v0.3.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking base16 v0.2.1
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]     Checking uint v0.8.5
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking blake2 v0.8.1
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]  Documenting casperlabs-types v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     feature(min_specialization, try_reserve)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `casperlabs-types`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name casperlabs_types src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=88778b758edd6433 -L dependency=/opt/rustwide/target/debug/deps --extern base16=/opt/rustwide/target/debug/deps/libbase16-072cc6ef92d6a636.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-22d7f70832a3b85e.rmeta --extern blake2=/opt/rustwide/target/debug/deps/libblake2-5c42d8637d1b271a.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-dc401b194bfd164b.rmeta --extern hex_fmt=/opt/rustwide/target/debug/deps/libhex_fmt-a19f30b9058bb8b0.rmeta --extern num_derive=/opt/rustwide/target/debug/deps/libnum_derive-741e2b726261b24b.so --extern num_integer=/opt/rustwide/target/debug/deps/libnum_integer-8479ac65c81f087a.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-3cd23fecf8ecfefc.rmeta --extern uint=/opt/rustwide/target/debug/deps/libuint-6ad9ca635966e5a4.rmeta --cap-lints=warn --crate-version 0.6.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6e1acd7f44e8c4a6e8cd3bcc6fea9e738b1273da49a395b6c241d3dc06a1352e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e1acd7f44e8c4a6e8cd3bcc6fea9e738b1273da49a395b6c241d3dc06a1352e", kill_on_drop: false }`
[INFO] [stdout] 6e1acd7f44e8c4a6e8cd3bcc6fea9e738b1273da49a395b6c241d3dc06a1352e