[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 1.54.0 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-81/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-81/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/9646516/U2.rs 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] removed /workspace/builds/worker-81/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-81/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" "+1.54.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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] 18ea7dd1823112c2de9abafefdedec3988415795e5c6d4be6d6bf87b3824f990
[INFO] running `Command { std: "docker" "start" "-a" "18ea7dd1823112c2de9abafefdedec3988415795e5c6d4be6d6bf87b3824f990", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18ea7dd1823112c2de9abafefdedec3988415795e5c6d4be6d6bf87b3824f990", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18ea7dd1823112c2de9abafefdedec3988415795e5c6d4be6d6bf87b3824f990", kill_on_drop: false }`
[INFO] [stdout] 18ea7dd1823112c2de9abafefdedec3988415795e5c6d4be6d6bf87b3824f990
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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] 45f3715d16f8b4eb3ae50f58123ff7c8071d305507b94d205e6082e87b0332a9
[INFO] running `Command { std: "docker" "start" "-a" "45f3715d16f8b4eb3ae50f58123ff7c8071d305507b94d205e6082e87b0332a9", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.63
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[INFO] [stderr]    Compiling serde_derive v1.0.124
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[INFO] [stderr]     Checking futures-core v0.3.13
[INFO] [stderr]     Checking new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling itoa v0.4.7
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[INFO] [stderr]     Checking signal-hook v0.1.17
[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
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[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 stable 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-f0f7b86fcee1bfb1.rmeta --extern enum_iterator=/opt/rustwide/target/debug/deps/libenum_iterator-4fa0193648eaee20.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-27602f14f69fe255.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-5cf113bed89cef2e.rmeta --extern log4rs=/opt/rustwide/target/debug/deps/liblog4rs-f70a37d6eae7c993.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-8f2112ee6a03e4f9.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-94de613266da53d4.rmeta --extern rev_lines=/opt/rustwide/target/debug/deps/librev_lines-6d696be7142a8653.rmeta --extern rss=/opt/rustwide/target/debug/deps/librss-5a6511a9c83b8403.rmeta --extern select=/opt/rustwide/target/debug/deps/libselect-d9ebc386b0a58ea4.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-db842345fc5f8e2f.rmeta --extern sysinfo=/opt/rustwide/target/debug/deps/libsysinfo-6c44ae326eabe33f.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-ee914af520281bea.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-4fa494b9ee551ba0.rmeta --extern tui=/opt/rustwide/target/debug/deps/libtui-ad7abdb05ae390fb.rmeta --cap-lints=warn --crate-version 1.0.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "45f3715d16f8b4eb3ae50f58123ff7c8071d305507b94d205e6082e87b0332a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45f3715d16f8b4eb3ae50f58123ff7c8071d305507b94d205e6082e87b0332a9", kill_on_drop: false }`
[INFO] [stdout] 45f3715d16f8b4eb3ae50f58123ff7c8071d305507b94d205e6082e87b0332a9
