[INFO] fetching crate casperlabs-contract-ffi 0.22.0...
[INFO] documenting casperlabs-contract-ffi-0.22.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate casperlabs-contract-ffi 0.22.0 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate casperlabs-contract-ffi 0.22.0 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-contract-ffi 0.22.0
[INFO] finished tweaking crates.io crate casperlabs-contract-ffi 0.22.0
[INFO] tweaked toml for crates.io crate casperlabs-contract-ffi 0.22.0 written to /workspace/builds/worker-20/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]     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 num-derive v0.2.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 3a5dece9bdea541ce8b7f26ec0298e3435a45fa60aeb34d9a07e5e19760bab38
[INFO] running `Command { std: "docker" "start" "-a" "3a5dece9bdea541ce8b7f26ec0298e3435a45fa60aeb34d9a07e5e19760bab38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3a5dece9bdea541ce8b7f26ec0298e3435a45fa60aeb34d9a07e5e19760bab38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a5dece9bdea541ce8b7f26ec0298e3435a45fa60aeb34d9a07e5e19760bab38", kill_on_drop: false }`
[INFO] [stdout] 3a5dece9bdea541ce8b7f26ec0298e3435a45fa60aeb34d9a07e5e19760bab38
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 314e8f380bbc1116a781a32c56f427c6b22c18aed632d92c3113123ba84af16c
[INFO] running `Command { std: "docker" "start" "-a" "314e8f380bbc1116a781a32c56f427c6b22c18aed632d92c3113123ba84af16c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking memory_units v0.4.0
[INFO] [stderr]     Checking opaque-debug v0.2.3
[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]     Checking uint v0.8.5
[INFO] [stderr]    Compiling quote v0.6.13
[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 failure_derive v0.1.8
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]  Documenting casperlabs-contract-ffi v0.22.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `alloc::alloc::Alloc`
[INFO] [stdout]   --> src/contract_api/mod.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |     alloc::{Alloc, Global},
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             no `Alloc` in `alloc`
[INFO] [stdout]    |             help: a similar name exists in the module: `alloc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:47:1
[INFO] [stdout]    |
[INFO] [stdout] 47 | / #![feature(
[INFO] [stdout] 48 | |     allocator_api,
[INFO] [stdout] 49 | |     core_intrinsics,
[INFO] [stdout] 50 | |     lang_items,
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |     try_reserve
[INFO] [stdout] 54 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]   --> src/lib.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     specialization,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]    = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `casperlabs-contract-ffi`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name casperlabs_contract_ffi 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=96b0b3412bf0f259 -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-e97f7eecb109fbd7.so --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-93c55c1f8eb0ba45.rmeta --extern uint=/opt/rustwide/target/debug/deps/libuint-fcda970cf0e71bce.rmeta --extern wee_alloc=/opt/rustwide/target/debug/deps/libwee_alloc-867545a90f221752.rmeta --cap-lints=warn --crate-version 0.22.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "314e8f380bbc1116a781a32c56f427c6b22c18aed632d92c3113123ba84af16c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "314e8f380bbc1116a781a32c56f427c6b22c18aed632d92c3113123ba84af16c", kill_on_drop: false }`
[INFO] [stdout] 314e8f380bbc1116a781a32c56f427c6b22c18aed632d92c3113123ba84af16c