[INFO] fetching crate libbitcoin 0.3.0...
[INFO] documenting libbitcoin-0.3.0 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate libbitcoin 0.3.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate libbitcoin 0.3.0 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] started tweaking crates.io crate libbitcoin 0.3.0
[INFO] finished tweaking crates.io crate libbitcoin 0.3.0
[INFO] tweaked toml for crates.io crate libbitcoin 0.3.0 written to /workspace/builds/worker-6-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 amplify_derive v2.11.3
[INFO] [stderr]   Downloaded bip39 v1.2.0
[INFO] [stderr]   Downloaded darling_macro v0.13.4
[INFO] [stderr]   Downloaded darling v0.13.4
[INFO] [stderr]   Downloaded bech32 v0.8.1
[INFO] [stderr]   Downloaded amplify v3.14.2
[INFO] [stderr]   Downloaded amplify_num v0.4.1
[INFO] [stderr]   Downloaded serde_with v1.14.0
[INFO] [stderr]   Downloaded unicode-normalization v0.1.9
[INFO] [stderr]   Downloaded darling_core v0.13.4
[INFO] [stderr]   Downloaded bitcoin v0.28.2
[INFO] [stderr]   Downloaded bitcoin_hashes v0.10.0
[INFO] [stderr]   Downloaded bitcoin_hashes v0.11.0
[INFO] [stderr]   Downloaded amplify_syn v1.1.6
[INFO] [stderr]   Downloaded serde_with_macros v1.5.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] dfac1de6878c02171782af380da7733eb64dda0cca2b69d392f7152ea0beacea
[INFO] running `Command { std: "docker" "start" "-a" "dfac1de6878c02171782af380da7733eb64dda0cca2b69d392f7152ea0beacea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dfac1de6878c02171782af380da7733eb64dda0cca2b69d392f7152ea0beacea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfac1de6878c02171782af380da7733eb64dda0cca2b69d392f7152ea0beacea", kill_on_drop: false }`
[INFO] [stdout] dfac1de6878c02171782af380da7733eb64dda0cca2b69d392f7152ea0beacea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 059c67c1af737deb4017578d31503077e8e9266eb7c36d6fc34cc794b19d1e7e
[INFO] running `Command { std: "docker" "start" "-a" "059c67c1af737deb4017578d31503077e8e9266eb7c36d6fc34cc794b19d1e7e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking bitcoin_hashes v0.10.0
[INFO] [stderr]     Checking bitcoin_hashes v0.11.0
[INFO] [stderr]     Checking bech32 v0.8.1
[INFO] [stderr]     Checking amplify_num v0.4.1
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking unicode-normalization v0.1.9
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling secp256k1-sys v0.5.2
[INFO] [stderr]    Compiling darling_core v0.13.4
[INFO] [stderr]    Compiling amplify_syn v1.1.6
[INFO] [stderr]    Compiling serde_derive v1.0.196
[INFO] [stderr]    Compiling amplify_derive v2.11.3
[INFO] [stderr]     Checking secp256k1 v0.22.2
[INFO] [stderr]    Compiling darling_macro v0.13.4
[INFO] [stderr]     Checking bitcoin v0.28.2
[INFO] [stderr]    Compiling darling v0.13.4
[INFO] [stderr]    Compiling serde_with_macros v1.5.2
[INFO] [stderr]     Checking amplify v3.14.2
[INFO] [stderr]     Checking serde v1.0.196
[INFO] [stderr]     Checking bip39 v1.2.0
[INFO] [stderr]     Checking serde_json v1.0.113
[INFO] [stderr]     Checking serde_with v1.14.0
[INFO] [stderr]  Documenting libbitcoin v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(try_trait_v2)]
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 document `libbitcoin`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type lib --crate-name libbitcoin src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b7adda6f6d8400c0 -L dependency=/opt/rustwide/target/debug/deps --extern amplify=/opt/rustwide/target/debug/deps/libamplify-9725c53bc1e37d48.rmeta --extern amplify_derive=/opt/rustwide/target/debug/deps/libamplify_derive-c3406f091b946de3.so --extern bip39=/opt/rustwide/target/debug/deps/libbip39-f512a587064860c3.rmeta --extern bitcoin=/opt/rustwide/target/debug/deps/libbitcoin-a9400a8952d0fffa.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-900704033b235124.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-90dcd21b8f97cd2f.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-848a0b6800dda5b6.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-2ce2a5a9da83ad83.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-3c4c6265586183ac.rmeta --extern serde_with=/opt/rustwide/target/debug/deps/libserde_with-76be2e7be1168381.rmeta --extern serde_with_macros=/opt/rustwide/target/debug/deps/libserde_with_macros-e00c0b2ced30832f.so --cap-lints=warn --crate-version 0.3.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "059c67c1af737deb4017578d31503077e8e9266eb7c36d6fc34cc794b19d1e7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "059c67c1af737deb4017578d31503077e8e9266eb7c36d6fc34cc794b19d1e7e", kill_on_drop: false }`
[INFO] [stdout] 059c67c1af737deb4017578d31503077e8e9266eb7c36d6fc34cc794b19d1e7e
