[INFO] cloning repository https://github.com/9646516/U2.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/9646516/U2.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F9646516%2FU2.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F9646516%2FU2.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 483578b1263bb4c362ef20ac335edbbd416baee5
[INFO] documenting 9646516/U2.rs against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F9646516%2FU2.rs" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/9646516/U2.rs 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] removed /workspace/builds/worker-11/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/9646516/U2.rs
[INFO] finished tweaking git repo https://github.com/9646516/U2.rs
[INFO] tweaked toml for git repo https://github.com/9646516/U2.rs written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/9646516/U2.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]   Downloaded sysinfo v0.16.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] dabeda3ae04ce7d3b776102f0bde385ccc2a2d697cae8b6d08bfa8eab8f0e3ee
[INFO] running `Command { std: "docker" "start" "-a" "dabeda3ae04ce7d3b776102f0bde385ccc2a2d697cae8b6d08bfa8eab8f0e3ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dabeda3ae04ce7d3b776102f0bde385ccc2a2d697cae8b6d08bfa8eab8f0e3ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dabeda3ae04ce7d3b776102f0bde385ccc2a2d697cae8b6d08bfa8eab8f0e3ee", kill_on_drop: false }`
[INFO] [stdout] dabeda3ae04ce7d3b776102f0bde385ccc2a2d697cae8b6d08bfa8eab8f0e3ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] 1ad8d01951588326d5415ed24b10995744e0fef66b8da775adc1cd81d5dba599
[INFO] running `Command { std: "docker" "start" "-a" "1ad8d01951588326d5415ed24b10995744e0fef66b8da775adc1cd81d5dba599", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
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[INFO] [stderr]    Compiling proc-macro2 v1.0.24
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[INFO] [stderr]     Checking serde_urlencoded v0.7.0
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[INFO] [stderr]     Checking want v0.3.0
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[INFO] [stderr]     Checking cookie_store v0.12.0
[INFO] [stderr]     Checking log4rs v1.0.0
[INFO] [stderr]     Checking crossterm v0.18.2
[INFO] [stderr]     Checking crossterm v0.19.0
[INFO] [stderr]    Compiling markup5ever v0.10.0
[INFO] [stderr]     Checking tui v0.14.0
[INFO] [stderr]     Checking tokio-util v0.6.4
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking h2 v0.3.1
[INFO] [stderr]     Checking xml5ever v0.16.1
[INFO] [stderr]     Checking markup5ever_rcdom v0.1.0
[INFO] [stderr]     Checking select v0.5.0
[INFO] [stderr]     Checking hyper v0.14.4
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.2
[INFO] [stderr]  Documenting u2 v1.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(async_closure)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[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 document `u2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name u2 src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern crossterm=/opt/rustwide/target/debug/deps/libcrossterm-6f729c73acdd1052.rmeta --extern enum_iterator=/opt/rustwide/target/debug/deps/libenum_iterator-9c07a97425fb4551.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-3c8ff55d7139a43f.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-5f72582f6944652c.rmeta --extern log4rs=/opt/rustwide/target/debug/deps/liblog4rs-64b171fbef6a43b4.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-ca10d0679fa89474.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-bd008fc67c457423.rmeta --extern rev_lines=/opt/rustwide/target/debug/deps/librev_lines-8c83c5084818e2ea.rmeta --extern rss=/opt/rustwide/target/debug/deps/librss-dc8f1d5502dd41f5.rmeta --extern select=/opt/rustwide/target/debug/deps/libselect-921187a4e8a87d68.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-1b34c5e8bab93c65.rmeta --extern sysinfo=/opt/rustwide/target/debug/deps/libsysinfo-da75dfb4ba725ee1.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-55553f2a77bedbb5.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-d1d3e4b74f0805b8.rmeta --extern tui=/opt/rustwide/target/debug/deps/libtui-9afc1efbbcad9779.rmeta --cap-lints=warn --crate-version 1.0.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1ad8d01951588326d5415ed24b10995744e0fef66b8da775adc1cd81d5dba599", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ad8d01951588326d5415ed24b10995744e0fef66b8da775adc1cd81d5dba599", kill_on_drop: false }`
[INFO] [stdout] 1ad8d01951588326d5415ed24b10995744e0fef66b8da775adc1cd81d5dba599
