[INFO] fetching crate protected_integer 0.1.1...
[INFO] documenting protected_integer-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate protected_integer 0.1.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate protected_integer 0.1.1 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 protected_integer 0.1.1
[INFO] finished tweaking crates.io crate protected_integer 0.1.1
[INFO] tweaked toml for crates.io crate protected_integer 0.1.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate protected_integer 0.1.1 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a9b3fb550eca7eec9b7e65967a5fbe7aab5b6b877c20c9425472363efeb3ef62
[INFO] running `Command { std: "docker" "start" "-a" "a9b3fb550eca7eec9b7e65967a5fbe7aab5b6b877c20c9425472363efeb3ef62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9b3fb550eca7eec9b7e65967a5fbe7aab5b6b877c20c9425472363efeb3ef62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9b3fb550eca7eec9b7e65967a5fbe7aab5b6b877c20c9425472363efeb3ef62", kill_on_drop: false }`
[INFO] [stdout] a9b3fb550eca7eec9b7e65967a5fbe7aab5b6b877c20c9425472363efeb3ef62
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b34a5a53debb89b32ff2ab70e8e3f04b5c47ae94cefa767cb8d3754ab13f4712
[INFO] running `Command { std: "docker" "start" "-a" "b34a5a53debb89b32ff2ab70e8e3f04b5c47ae94cefa767cb8d3754ab13f4712", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.123
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]  Documenting protected_integer v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | #![feature(test)]
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 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 `protected_integer`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name protected_integer src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=91a2af9b3922458b -L dependency=/opt/rustwide/target/debug/deps --extern num=/opt/rustwide/target/debug/deps/libnum-e6fe91b9e9d369c9.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-16d63e3148ece7cb.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "b34a5a53debb89b32ff2ab70e8e3f04b5c47ae94cefa767cb8d3754ab13f4712", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b34a5a53debb89b32ff2ab70e8e3f04b5c47ae94cefa767cb8d3754ab13f4712", kill_on_drop: false }`
[INFO] [stdout] b34a5a53debb89b32ff2ab70e8e3f04b5c47ae94cefa767cb8d3754ab13f4712