[INFO] fetching crate i-o 0.4.7...
[INFO] documenting i-o-0.4.7 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate i-o 0.4.7 into /workspace/builds/worker-82/source
[INFO] validating manifest of crates.io crate i-o 0.4.7 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate i-o 0.4.7
[INFO] finished tweaking crates.io crate i-o 0.4.7
[INFO] tweaked toml for crates.io crate i-o 0.4.7 written to /workspace/builds/worker-82/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", 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]  Downloading crates ...
[INFO] [stderr]   Downloaded loca v0.7.2
[INFO] [stderr]   Downloaded fallible v0.1.3
[INFO] [stderr]   Downloaded hash-table v0.2.5
[INFO] [stderr]   Downloaded abort v0.1.3
[INFO] [stderr]   Downloaded default_allocator v0.3.0
[INFO] [stderr]   Downloaded heap v0.1.0
[INFO] [stderr]   Downloaded rel v0.2.0
[INFO] [stderr]   Downloaded quickcheck v0.7.2
[INFO] [stderr]   Downloaded containers v0.9.12
[INFO] [stderr]   Downloaded ptr v0.2.3
[INFO] [stderr]   Downloaded quickcheck_macros v0.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 12b472b0a6429d83ed033a3edec2abe34e664cfe5c4f326aa83952c6c8c9c3b1
[INFO] running `Command { std: "docker" "start" "-a" "12b472b0a6429d83ed033a3edec2abe34e664cfe5c4f326aa83952c6c8c9c3b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12b472b0a6429d83ed033a3edec2abe34e664cfe5c4f326aa83952c6c8c9c3b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12b472b0a6429d83ed033a3edec2abe34e664cfe5c4f326aa83952c6c8c9c3b1", kill_on_drop: false }`
[INFO] [stdout] 12b472b0a6429d83ed033a3edec2abe34e664cfe5c4f326aa83952c6c8c9c3b1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2004712327ebda25e381282a0d439e6b3b5bfbfa32b94a8854fa5a25377f4c15
[INFO] running `Command { std: "docker" "start" "-a" "2004712327ebda25e381282a0d439e6b3b5bfbfa32b94a8854fa5a25377f4c15", 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]     Checking void v1.0.2
[INFO] [stderr]     Checking siphasher v0.2.3
[INFO] [stderr]    Compiling containers v0.9.12
[INFO] [stderr]     Checking rel v0.2.0
[INFO] [stderr]    Compiling i-o v0.4.7 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking abort v0.1.3
[INFO] [stderr]     Checking heap v0.1.0
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking fallible v0.1.3
[INFO] [stderr] error: Cannot set `RUSTC_BOOTSTRAP=1` from build script of `i-o v0.4.7 (/opt/rustwide/workdir)`.
[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 beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ptr-0.2.3/src/lib.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![feature(coerce_unsized)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ptr-0.2.3/src/lib.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(unsize)]
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "2004712327ebda25e381282a0d439e6b3b5bfbfa32b94a8854fa5a25377f4c15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2004712327ebda25e381282a0d439e6b3b5bfbfa32b94a8854fa5a25377f4c15", kill_on_drop: false }`
[INFO] [stdout] 2004712327ebda25e381282a0d439e6b3b5bfbfa32b94a8854fa5a25377f4c15
