[INFO] fetching crate null-terminated 0.3.17...
[INFO] documenting null-terminated-0.3.17 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate null-terminated 0.3.17 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate null-terminated 0.3.17 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 null-terminated 0.3.17
[INFO] finished tweaking crates.io crate null-terminated 0.3.17
[INFO] tweaked toml for crates.io crate null-terminated 0.3.17 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate null-terminated 0.3.17 already has a lockfile, it will not be regenerated
[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 quickcheck v0.8.5
[INFO] [stderr]   Downloaded quickcheck_macros v0.8.0
[INFO] [stderr]   Downloaded bitflags v1.0.3
[INFO] [stderr]   Downloaded libc v0.2.42
[INFO] [stderr]   Downloaded lazy_static v1.0.2
[INFO] [stderr]   Downloaded byte-strings-proc_macros v0.2.1
[INFO] [stderr]   Downloaded cfg-if v0.1.4
[INFO] [stderr]   Downloaded log v0.4.3
[INFO] [stderr]   Downloaded winapi v0.3.5
[INFO] [stderr]   Downloaded system-call v0.1.1
[INFO] [stderr]   Downloaded utf v0.1.0
[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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 08b178d30a085b47e74b7ffba2566db848c63283583953d40f40c1bfd4015e54
[INFO] running `Command { std: "docker" "start" "-a" "08b178d30a085b47e74b7ffba2566db848c63283583953d40f40c1bfd4015e54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08b178d30a085b47e74b7ffba2566db848c63283583953d40f40c1bfd4015e54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08b178d30a085b47e74b7ffba2566db848c63283583953d40f40c1bfd4015e54", kill_on_drop: false }`
[INFO] [stdout] 08b178d30a085b47e74b7ffba2566db848c63283583953d40f40c1bfd4015e54
[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: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] 890d0727f12d0cbd91c9d43161b25bee074b68302a5a632f129628799c23e49b
[INFO] running `Command { std: "docker" "start" "-a" "890d0727f12d0cbd91c9d43161b25bee074b68302a5a632f129628799c23e49b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.36
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking utf v0.1.0
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling byte-strings-proc_macros v0.2.1
[INFO] [stderr]  Documenting null-terminated v0.3.17 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:25:1
[INFO] [stdout]    |
[INFO] [stdout] 25 | #![feature(const_raw_ptr_deref)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `const_raw_ptr_deref` has been stable since 1.58.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:26:1
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![feature(extern_types)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `null-terminated`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name null_terminated src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="utf"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9646b7283df2202f -L dependency=/opt/rustwide/target/debug/deps --extern byte_strings_proc_macros=/opt/rustwide/target/debug/deps/libbyte_strings_proc_macros-dece8d963cb84a60.so --extern unreachable=/opt/rustwide/target/debug/deps/libunreachable-f45622c39650b1fe.rmeta --extern utf=/opt/rustwide/target/debug/deps/libutf-9ce0c5f99e65d86d.rmeta --cap-lints=warn --crate-version 0.3.17` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "890d0727f12d0cbd91c9d43161b25bee074b68302a5a632f129628799c23e49b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "890d0727f12d0cbd91c9d43161b25bee074b68302a5a632f129628799c23e49b", kill_on_drop: false }`
[INFO] [stdout] 890d0727f12d0cbd91c9d43161b25bee074b68302a5a632f129628799c23e49b