[INFO] fetching crate hamt-sync 0.2.5...
[INFO] documenting hamt-sync-0.2.5 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate hamt-sync 0.2.5 into /workspace/builds/worker-115/source
[INFO] validating manifest of crates.io crate hamt-sync 0.2.5 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 hamt-sync 0.2.5
[INFO] finished tweaking crates.io crate hamt-sync 0.2.5
[INFO] tweaked toml for crates.io crate hamt-sync 0.2.5 written to /workspace/builds/worker-115/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/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] 087551d80446caa3a7dcd9d1e1cf5e542593f9cf43c52ae1f9c2acea9e75b856
[INFO] running `Command { std: "docker" "start" "-a" "087551d80446caa3a7dcd9d1e1cf5e542593f9cf43c52ae1f9c2acea9e75b856", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "087551d80446caa3a7dcd9d1e1cf5e542593f9cf43c52ae1f9c2acea9e75b856", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "087551d80446caa3a7dcd9d1e1cf5e542593f9cf43c52ae1f9c2acea9e75b856", kill_on_drop: false }`
[INFO] [stdout] 087551d80446caa3a7dcd9d1e1cf5e542593f9cf43c52ae1f9c2acea9e75b856
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-115/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] f4f541d635982d669f08ce1ef5a0cc5798f26966dbf803c8e2013f504723c4d7
[INFO] running `Command { std: "docker" "start" "-a" "f4f541d635982d669f08ce1ef5a0cc5798f26966dbf803c8e2013f504723c4d7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]  Documenting hamt-sync v0.2.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `hamt-sync`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name hamt_sync src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6af7c874ace0f4d3 -L dependency=/opt/rustwide/target/debug/deps --extern rand=/opt/rustwide/target/debug/deps/librand-712d6f41f7d61211.rmeta --cap-lints=warn --crate-version 0.2.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f4f541d635982d669f08ce1ef5a0cc5798f26966dbf803c8e2013f504723c4d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4f541d635982d669f08ce1ef5a0cc5798f26966dbf803c8e2013f504723c4d7", kill_on_drop: false }`
[INFO] [stdout] f4f541d635982d669f08ce1ef5a0cc5798f26966dbf803c8e2013f504723c4d7