[INFO] fetching crate buf 0.2.3...
[INFO] documenting buf-0.2.3 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate buf 0.2.3 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate buf 0.2.3 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate buf 0.2.3
[INFO] finished tweaking crates.io crate buf 0.2.3
[INFO] tweaked toml for crates.io crate buf 0.2.3 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 26b2338916b884aa5aa0812b6f89d26bc3f11292b1f6b8be67aef4ff290053c5
[INFO] running `Command { std: "docker" "start" "-a" "26b2338916b884aa5aa0812b6f89d26bc3f11292b1f6b8be67aef4ff290053c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26b2338916b884aa5aa0812b6f89d26bc3f11292b1f6b8be67aef4ff290053c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26b2338916b884aa5aa0812b6f89d26bc3f11292b1f6b8be67aef4ff290053c5", kill_on_drop: false }`
[INFO] [stdout] 26b2338916b884aa5aa0812b6f89d26bc3f11292b1f6b8be67aef4ff290053c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 96b326c3a20fed79e4944694ed830f5b63330170234e3c27187939d212523ad8
[INFO] running `Command { std: "docker" "start" "-a" "96b326c3a20fed79e4944694ed830f5b63330170234e3c27187939d212523ad8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling ptr v0.2.3
[INFO] [stderr]    Compiling hash-table v0.2.5
[INFO] [stderr]    Compiling containers v0.9.12
[INFO] [stderr]     Checking siphasher v0.2.3
[INFO] [stderr]     Checking heap v0.1.0
[INFO] [stderr]    Compiling i-o v0.4.7
[INFO] [stderr]     Checking rel v0.2.0
[INFO] [stderr]     Checking abort v0.1.3
[INFO] [stderr]     Checking fallible v0.1.3
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr] error: Cannot set `RUSTC_BOOTSTRAP=1` from build script of `i-o v0.4.7`.
[INFO] [stderr] note: Crates cannot set `RUSTC_BOOTSTRAP` themselves, as doing so would subvert the stability guarantees of Rust for your project.
[INFO] [stderr] help: If you're sure you want to do this in your project, set the environment variable `RUSTC_BOOTSTRAP=io` before running cargo instead.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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/hash-table-0.2.5/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(maybe_uninit_ref)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/hash-table-0.2.5/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(non_ascii_idents)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `non_ascii_idents` has been stable since 1.53.0 and no longer requires an attribute to enable
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "96b326c3a20fed79e4944694ed830f5b63330170234e3c27187939d212523ad8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96b326c3a20fed79e4944694ed830f5b63330170234e3c27187939d212523ad8", kill_on_drop: false }`
[INFO] [stdout] 96b326c3a20fed79e4944694ed830f5b63330170234e3c27187939d212523ad8
