[INFO] cloning repository https://github.com/Kevingislason/rust_bitcoin_hardware_wallet_demos
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Kevingislason/rust_bitcoin_hardware_wallet_demos" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKevingislason%2Frust_bitcoin_hardware_wallet_demos", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKevingislason%2Frust_bitcoin_hardware_wallet_demos'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b3f36a6b856cce40e99f81289c96a8bca040a3cb
[INFO] documenting Kevingislason/rust_bitcoin_hardware_wallet_demos 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%2FKevingislason%2Frust_bitcoin_hardware_wallet_demos" "/workspace/builds/worker-30/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-30/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Kevingislason/rust_bitcoin_hardware_wallet_demos 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 git repo https://github.com/Kevingislason/rust_bitcoin_hardware_wallet_demos
[INFO] finished tweaking git repo https://github.com/Kevingislason/rust_bitcoin_hardware_wallet_demos
[INFO] tweaked toml for git repo https://github.com/Kevingislason/rust_bitcoin_hardware_wallet_demos written to /workspace/builds/worker-30/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] [stderr]     Blocking waiting for file lock on package cache
[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 auto_ops v0.1.0
[INFO] [stderr]   Downloaded bigint v4.4.3
[INFO] [stderr]   Downloaded bech32 v0.7.3
[INFO] [stderr]   Downloaded genio v0.2.1
[INFO] [stderr]   Downloaded secp256k1 v0.12.2
[INFO] [stderr]   Downloaded ripemd160 v0.8.0
[INFO] [stderr]   Downloaded bitcoin_hashes v0.7.6
[INFO] [stderr]   Downloaded bitcoin v0.19.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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] 1a49666c131535bc5655908fc057c9be6f4c3019c28ee6cf6ae5b9060c661d5c
[INFO] running `Command { std: "docker" "start" "-a" "1a49666c131535bc5655908fc057c9be6f4c3019c28ee6cf6ae5b9060c661d5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a49666c131535bc5655908fc057c9be6f4c3019c28ee6cf6ae5b9060c661d5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a49666c131535bc5655908fc057c9be6f4c3019c28ee6cf6ae5b9060c661d5c", kill_on_drop: false }`
[INFO] [stdout] 1a49666c131535bc5655908fc057c9be6f4c3019c28ee6cf6ae5b9060c661d5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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] c494e07d4ea5844ec64c8aba25076aa32eb72badf8920afd1aaf10e1acea07fb
[INFO] running `Command { std: "docker" "start" "-a" "c494e07d4ea5844ec64c8aba25076aa32eb72badf8920afd1aaf10e1acea07fb", kill_on_drop: false }`
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]    Compiling cc v1.0.26
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]     Checking bech32 v0.7.3
[INFO] [stderr]     Checking ahash v0.3.8
[INFO] [stderr]     Checking bitcoin_hashes v0.7.6
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking auto_ops v0.1.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling hashbrown v0.7.2
[INFO] [stderr]     Checking genio v0.2.1
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking pbkdf2 v0.3.0
[INFO] [stderr]     Checking hmac v0.7.1
[INFO] [stderr]     Checking ripemd160 v0.8.0
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]     Checking bigint v4.4.3
[INFO] [stderr]    Compiling secp256k1 v0.12.2
[INFO] [stderr]     Checking bitcoin v0.19.2
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]  Documenting rust_bitcoin_hardware_wallet_demos v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(const_int_pow)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `rust_bitcoin_hardware_wallet_demos`
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rust_bitcoin_hardware_wallet_demos src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=90e8d6a7686f1d11 -L dependency=/opt/rustwide/target/debug/deps --extern auto_ops=/opt/rustwide/target/debug/deps/libauto_ops-05842d81633048f5.rmeta --extern bigint=/opt/rustwide/target/debug/deps/libbigint-9231725c29d385b5.rmeta --extern bit_vec=/opt/rustwide/target/debug/deps/libbit_vec-1fb26c74ecd114a1.rmeta --extern bitcoin=/opt/rustwide/target/debug/deps/libbitcoin-4148035dee529b6c.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-7c274f399d426ec2.rmeta --extern genio=/opt/rustwide/target/debug/deps/libgenio-0ebda8f8a8122f4d.rmeta --extern hashbrown=/opt/rustwide/target/debug/deps/libhashbrown-7be602de7cc468a3.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-e6e12260d7fb4e79.rmeta --extern hmac=/opt/rustwide/target/debug/deps/libhmac-f9ba04b0f32a14cb.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-e573c973b9fc42cf.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-9d0fb7f65d2860a4.rmeta --extern pbkdf2=/opt/rustwide/target/debug/deps/libpbkdf2-1097f4a775433cad.rmeta --extern ripemd160=/opt/rustwide/target/debug/deps/libripemd160-2ddd9efec5ab7417.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-495ec9fdc6b7531e.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-84804b189a9ff221.rmeta --extern void=/opt/rustwide/target/debug/deps/libvoid-2ce7c7c676ef0759.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "c494e07d4ea5844ec64c8aba25076aa32eb72badf8920afd1aaf10e1acea07fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c494e07d4ea5844ec64c8aba25076aa32eb72badf8920afd1aaf10e1acea07fb", kill_on_drop: false }`
[INFO] [stdout] c494e07d4ea5844ec64c8aba25076aa32eb72badf8920afd1aaf10e1acea07fb