[INFO] fetching crate pi_slotmap_tree 0.2.1...
[INFO] documenting pi_slotmap_tree-0.2.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate pi_slotmap_tree 0.2.1 into /workspace/builds/worker-34/source
[INFO] validating manifest of crates.io crate pi_slotmap_tree 0.2.1 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 pi_slotmap_tree 0.2.1
[INFO] finished tweaking crates.io crate pi_slotmap_tree 0.2.1
[INFO] tweaked toml for crates.io crate pi_slotmap_tree 0.2.1 written to /workspace/builds/worker-34/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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pi_null v0.1.0
[INFO] [stderr]   Downloaded pi_print_any v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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] b6eb798f2734f23ee8d6be417cf4f288816a46e8f5b6fd511cc5cd932c37b394
[INFO] running `Command { std: "docker" "start" "-a" "b6eb798f2734f23ee8d6be417cf4f288816a46e8f5b6fd511cc5cd932c37b394", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b6eb798f2734f23ee8d6be417cf4f288816a46e8f5b6fd511cc5cd932c37b394", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6eb798f2734f23ee8d6be417cf4f288816a46e8f5b6fd511cc5cd932c37b394", kill_on_drop: false }`
[INFO] [stdout] b6eb798f2734f23ee8d6be417cf4f288816a46e8f5b6fd511cc5cd932c37b394
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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] b08c08cdcf078ee07c6e6d21c4f890bf383491fa35cbc786afafd164c829fc04
[INFO] running `Command { std: "docker" "start" "-a" "b08c08cdcf078ee07c6e6d21c4f890bf383491fa35cbc786afafd164c829fc04", 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] [stderr]     Checking pi_print_any v0.1.0
[INFO] [stderr]     Checking pi_null v0.1.0
[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/pi_print_any-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[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 `pi_print_any` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "b08c08cdcf078ee07c6e6d21c4f890bf383491fa35cbc786afafd164c829fc04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b08c08cdcf078ee07c6e6d21c4f890bf383491fa35cbc786afafd164c829fc04", kill_on_drop: false }`
[INFO] [stdout] b08c08cdcf078ee07c6e6d21c4f890bf383491fa35cbc786afafd164c829fc04