[INFO] fetching crate taylor 0.0.1...
[INFO] documenting taylor-0.0.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate taylor 0.0.1 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate taylor 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 taylor 0.0.1
[INFO] finished tweaking crates.io crate taylor 0.0.1
[INFO] tweaked toml for crates.io crate taylor 0.0.1 written to /workspace/builds/worker-12/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]  Downloading crates ...
[INFO] [stderr]   Downloaded factorial v0.2.1
[INFO] [stderr]   Downloaded math-ast v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] d2f536994ae776c4ee55051722f0474c0362122ebd8c3c727df5de0d8ec4c966
[INFO] running `Command { std: "docker" "start" "-a" "d2f536994ae776c4ee55051722f0474c0362122ebd8c3c727df5de0d8ec4c966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2f536994ae776c4ee55051722f0474c0362122ebd8c3c727df5de0d8ec4c966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2f536994ae776c4ee55051722f0474c0362122ebd8c3c727df5de0d8ec4c966", kill_on_drop: false }`
[INFO] [stdout] d2f536994ae776c4ee55051722f0474c0362122ebd8c3c727df5de0d8ec4c966
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 2dd5256372a4427a2e487922288a0961afffc4b4d59f380837db6e90b03fa4f7
[INFO] running `Command { std: "docker" "start" "-a" "2dd5256372a4427a2e487922288a0961afffc4b4d59f380837db6e90b03fa4f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.3.3
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]     Checking num-complex v0.3.1
[INFO] [stderr]     Checking factorial v0.2.1
[INFO] [stderr]     Checking num v0.3.1
[INFO] [stderr]     Checking math-ast v0.2.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/math-ast-0.2.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax)]
[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 compile `math-ast` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2dd5256372a4427a2e487922288a0961afffc4b4d59f380837db6e90b03fa4f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2dd5256372a4427a2e487922288a0961afffc4b4d59f380837db6e90b03fa4f7", kill_on_drop: false }`
[INFO] [stdout] 2dd5256372a4427a2e487922288a0961afffc4b4d59f380837db6e90b03fa4f7