[INFO] fetching crate r3 0.2.2...
[INFO] documenting r3-0.2.2 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate r3 0.2.2 into /workspace/builds/worker-35/source
[INFO] validating manifest of crates.io crate r3 0.2.2 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 r3 0.2.2
[INFO] finished tweaking crates.io crate r3 0.2.2
[INFO] tweaked toml for crates.io crate r3 0.2.2 written to /workspace/builds/worker-35/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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] 411c7e8bf1793ffb8c9ec619e503fec584d85b92dbd087a6b87b8d757fceae0c
[INFO] running `Command { std: "docker" "start" "-a" "411c7e8bf1793ffb8c9ec619e503fec584d85b92dbd087a6b87b8d757fceae0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "411c7e8bf1793ffb8c9ec619e503fec584d85b92dbd087a6b87b8d757fceae0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "411c7e8bf1793ffb8c9ec619e503fec584d85b92dbd087a6b87b8d757fceae0c", kill_on_drop: false }`
[INFO] [stdout] 411c7e8bf1793ffb8c9ec619e503fec584d85b92dbd087a6b87b8d757fceae0c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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] fef2112eb28cfbea06b590393b4d7ce4b97e89f0f279a243d8062e88631edfc0
[INFO] running `Command { std: "docker" "start" "-a" "fef2112eb28cfbea06b590393b4d7ce4b97e89f0f279a243d8062e88631edfc0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling base64 v0.13.0
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]     Checking tokenlock v0.3.7
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]    Compiling seq-macro v0.3.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking elain v0.3.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[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/memoffset-0.6.5/src/lib.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 61 |     feature(const_ptr_offset_from, const_refs_to_cell)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quote v1.0.18
[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/memoffset-0.6.5/src/lib.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |     feature(const_ptr_offset_from, const_refs_to_cell)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 compile `memoffset` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "fef2112eb28cfbea06b590393b4d7ce4b97e89f0f279a243d8062e88631edfc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fef2112eb28cfbea06b590393b4d7ce4b97e89f0f279a243d8062e88631edfc0", kill_on_drop: false }`
[INFO] [stdout] fef2112eb28cfbea06b590393b4d7ce4b97e89f0f279a243d8062e88631edfc0