[INFO] fetching crate calculator 0.0.1...
[INFO] documenting calculator-0.0.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate calculator 0.0.1 into /workspace/builds/worker-102/source
[INFO] validating manifest of crates.io crate calculator 0.0.1 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 calculator 0.0.1
[INFO] finished tweaking crates.io crate calculator 0.0.1
[INFO] tweaked toml for crates.io crate calculator 0.0.1 written to /workspace/builds/worker-102/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]  Downloading crates ...
[INFO] [stderr]   Downloaded vec_map v0.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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] 49f2106f792f92b5430c25e509711df1b55b430b89fcb21beb9fcf9a478125fe
[INFO] running `Command { std: "docker" "start" "-a" "49f2106f792f92b5430c25e509711df1b55b430b89fcb21beb9fcf9a478125fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "49f2106f792f92b5430c25e509711df1b55b430b89fcb21beb9fcf9a478125fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49f2106f792f92b5430c25e509711df1b55b430b89fcb21beb9fcf9a478125fe", kill_on_drop: false }`
[INFO] [stdout] 49f2106f792f92b5430c25e509711df1b55b430b89fcb21beb9fcf9a478125fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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] 1d50dc70d66b83f3bc9ec1113ef555a4ae8c111ff094af56364dd01a9f4eb13c
[INFO] running `Command { std: "docker" "start" "-a" "1d50dc70d66b83f3bc9ec1113ef555a4ae8c111ff094af56364dd01a9f4eb13c", kill_on_drop: false }`
[INFO] [stderr]     Checking vec_map v0.0.1
[INFO] [stderr]  Documenting calculator v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/expr.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(collections)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `collections`
[INFO] [stdout]  --> src/expr.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(collections)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `calculator`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name expr src/expr.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=941838bbbc9ef13a -L dependency=/opt/rustwide/target/debug/deps --extern vec_map=/opt/rustwide/target/debug/deps/libvec_map-a1a2d0cad75210ba.rmeta --cap-lints=warn --crate-version 0.0.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1d50dc70d66b83f3bc9ec1113ef555a4ae8c111ff094af56364dd01a9f4eb13c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d50dc70d66b83f3bc9ec1113ef555a4ae8c111ff094af56364dd01a9f4eb13c", kill_on_drop: false }`
[INFO] [stdout] 1d50dc70d66b83f3bc9ec1113ef555a4ae8c111ff094af56364dd01a9f4eb13c