[INFO] fetching crate casper-types 1.3.2...
[INFO] documenting casper-types-1.3.2 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate casper-types 1.3.2 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate casper-types 1.3.2 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate casper-types 1.3.2
[INFO] finished tweaking crates.io crate casper-types 1.3.2
[INFO] tweaked toml for crates.io crate casper-types 1.3.2 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0c966d3f3678c4a9c7510935cb96a0b0d1e2e035786aeecd3873d0a0b8441f4f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0c966d3f3678c4a9c7510935cb96a0b0d1e2e035786aeecd3873d0a0b8441f4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c966d3f3678c4a9c7510935cb96a0b0d1e2e035786aeecd3873d0a0b8441f4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c966d3f3678c4a9c7510935cb96a0b0d1e2e035786aeecd3873d0a0b8441f4f", kill_on_drop: false }`
[INFO] [stdout] 0c966d3f3678c4a9c7510935cb96a0b0d1e2e035786aeecd3873d0a0b8441f4f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] da1483b596213f14fd564aedd76402d3faefe9e1f4ac20f283995f78ba402f12
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "da1483b596213f14fd564aedd76402d3faefe9e1f4ac20f283995f78ba402f12", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking subtle v2.4.1
[INFO] [stderr]     Checking wyz v0.2.0
[INFO] [stderr]     Checking radium v0.3.0
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking crypto-mac v0.10.1
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking bitvec v0.18.5
[INFO] [stderr]     Checking signature v1.2.2
[INFO] [stderr]     Checking sha2 v0.9.5
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking uint v0.9.1
[INFO] [stderr]     Checking ed25519 v1.2.0
[INFO] [stderr]     Checking hmac v0.10.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking blake2 v0.9.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking ff v0.8.0
[INFO] [stderr]     Checking group v0.8.0
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling zeroize_derive v1.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling datasize_derive v0.2.9
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling displaydoc v0.1.7
[INFO] [stderr]     Checking zeroize v1.4.1
[INFO] [stderr]     Checking datasize v0.2.9
[INFO] [stderr]     Checking elliptic-curve v0.8.5
[INFO] [stderr]     Checking curve25519-dalek v3.2.0
[INFO] [stderr]     Checking ecdsa v0.10.2
[INFO] [stderr]     Checking ed25519-dalek v1.0.1
[INFO] [stderr]     Checking k256 v0.7.3
[INFO] [stderr]  Documenting casper-types v1.3.2 (/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 `casper-types`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name casper_types src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="displaydoc"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern base16=/opt/rustwide/target/debug/deps/libbase16-ae352888de8b7d37.rmeta --extern base64=/opt/rustwide/target/debug/deps/libbase64-386b2162eabc59c4.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-c759f8d07719039e.rmeta --extern blake2=/opt/rustwide/target/debug/deps/libblake2-f7641cca1ebda952.rmeta --extern datasize=/opt/rustwide/target/debug/deps/libdatasize-6e36681873cdb2c8.rmeta --extern displaydoc=/opt/rustwide/target/debug/deps/libdisplaydoc-91cc776e24f55522.so --extern ed25519_dalek=/opt/rustwide/target/debug/deps/libed25519_dalek-68eb9ad500041ea1.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-9791a3497cab3d69.rmeta --extern hex_fmt=/opt/rustwide/target/debug/deps/libhex_fmt-87013c2f3b265841.rmeta --extern k256=/opt/rustwide/target/debug/deps/libk256-bac16d55d33ac8ae.rmeta --extern num_derive=/opt/rustwide/target/debug/deps/libnum_derive-d5ad69b9b0a30e18.so --extern num_integer=/opt/rustwide/target/debug/deps/libnum_integer-66cfe384f2a5b264.rmeta --extern num_rational=/opt/rustwide/target/debug/deps/libnum_rational-5c0aee9c60b9c5ad.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-36a9706cfe4ada58.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-1b80003de675d828.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-2120c1336ebb52db.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-98072dc8aec1d505.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-fcd54114af97132a.rmeta --extern uint=/opt/rustwide/target/debug/deps/libuint-f97cb6deaf8a0143.rmeta --cap-lints=warn --crate-version 1.3.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "da1483b596213f14fd564aedd76402d3faefe9e1f4ac20f283995f78ba402f12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da1483b596213f14fd564aedd76402d3faefe9e1f4ac20f283995f78ba402f12", kill_on_drop: false }`
[INFO] [stdout] da1483b596213f14fd564aedd76402d3faefe9e1f4ac20f283995f78ba402f12
