[INFO] cloning repository https://github.com/ahmadkaouk/sender-receiver-failover
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ahmadkaouk/sender-receiver-failover" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fahmadkaouk%2Fsender-receiver-failover", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fahmadkaouk%2Fsender-receiver-failover'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c9f56f2e0f2b22186cfbd56cd3127ed122b69218
[INFO] documenting ahmadkaouk/sender-receiver-failover against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fahmadkaouk%2Fsender-receiver-failover" "/workspace/builds/worker-23/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-23/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ahmadkaouk/sender-receiver-failover 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 git repo https://github.com/ahmadkaouk/sender-receiver-failover
[INFO] finished tweaking git repo https://github.com/ahmadkaouk/sender-receiver-failover
[INFO] tweaked toml for git repo https://github.com/ahmadkaouk/sender-receiver-failover written to /workspace/builds/worker-23/source/Cargo.toml
[INFO] crate git repo https://github.com/ahmadkaouk/sender-receiver-failover already has a lockfile, it will not be regenerated
[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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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] 57cc2f40dad1b4dc1bd966ba308cfaa489ff7468b83ab10c41e375c7f8ddc895
[INFO] running `Command { std: "docker" "start" "-a" "57cc2f40dad1b4dc1bd966ba308cfaa489ff7468b83ab10c41e375c7f8ddc895", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57cc2f40dad1b4dc1bd966ba308cfaa489ff7468b83ab10c41e375c7f8ddc895", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57cc2f40dad1b4dc1bd966ba308cfaa489ff7468b83ab10c41e375c7f8ddc895", kill_on_drop: false }`
[INFO] [stdout] 57cc2f40dad1b4dc1bd966ba308cfaa489ff7468b83ab10c41e375c7f8ddc895
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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] 91ce32cd0a15040a79ddca93e05969bdfaa9e031120a1e987f802dfcea71e207
[INFO] running `Command { std: "docker" "start" "-a" "91ce32cd0a15040a79ddca93e05969bdfaa9e031120a1e987f802dfcea71e207", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling libc v0.2.117
[INFO] [stderr]    Compiling serde_json v1.0.78
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]     Checking nix v0.23.1
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]     Checking ctrlc v3.2.1
[INFO] [stderr]     Checking serde v1.0.136
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]  Documenting send_receive_failover v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(once_cell)]
[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 document `send_receive_failover`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name send_receive_failover src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=24f6b2d984d90c87 -L dependency=/opt/rustwide/target/debug/deps --extern ctrlc=/opt/rustwide/target/debug/deps/libctrlc-3db6f09fac0a96a1.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-47d418f0a60cf0a6.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-fcda267bd629dbbb.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-ef3d5d2d2ac23314.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "91ce32cd0a15040a79ddca93e05969bdfaa9e031120a1e987f802dfcea71e207", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91ce32cd0a15040a79ddca93e05969bdfaa9e031120a1e987f802dfcea71e207", kill_on_drop: false }`
[INFO] [stdout] 91ce32cd0a15040a79ddca93e05969bdfaa9e031120a1e987f802dfcea71e207