[INFO] cloning repository https://github.com/sinkuu/lambdarepl-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sinkuu/lambdarepl-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsinkuu%2Flambdarepl-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsinkuu%2Flambdarepl-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1935917f90a8026b7240622f48f09c3eeb6d46d6
[INFO] documenting sinkuu/lambdarepl-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%2Fsinkuu%2Flambdarepl-rs" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sinkuu/lambdarepl-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] started tweaking git repo https://github.com/sinkuu/lambdarepl-rs
[INFO] finished tweaking git repo https://github.com/sinkuu/lambdarepl-rs
[INFO] tweaked toml for git repo https://github.com/sinkuu/lambdarepl-rs written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/sinkuu/lambdarepl-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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 8390555c9f1679b7049e033b5a2f94d293f9e8eb3d700a52662f29e54d2bec5e
[INFO] running `Command { std: "docker" "start" "-a" "8390555c9f1679b7049e033b5a2f94d293f9e8eb3d700a52662f29e54d2bec5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8390555c9f1679b7049e033b5a2f94d293f9e8eb3d700a52662f29e54d2bec5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8390555c9f1679b7049e033b5a2f94d293f9e8eb3d700a52662f29e54d2bec5e", kill_on_drop: false }`
[INFO] [stdout] 8390555c9f1679b7049e033b5a2f94d293f9e8eb3d700a52662f29e54d2bec5e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 9d9cfe7910b98ce8f5a73651b7fe6f01538cee191d86a979e40cc1dc3eb52183
[INFO] running `Command { std: "docker" "start" "-a" "9d9cfe7910b98ce8f5a73651b7fe6f01538cee191d86a979e40cc1dc3eb52183", 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]     Checking ascii v0.7.1
[INFO] [stderr]    Compiling nix v0.6.0
[INFO] [stderr]     Checking combine v2.0.0-beta3
[INFO] [stderr]     Checking linefeed v0.1.5
[INFO] [stderr]  Documenting lambdarepl 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(question_mark)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `question_mark` has been stable since 1.13.0 and no longer requires an attribute to enable
[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 `lambdarepl`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name lambdarepl 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 ansi_term=/opt/rustwide/target/debug/deps/libansi_term-d964830ed0d481f2.rmeta --extern combine=/opt/rustwide/target/debug/deps/libcombine-2daa125f05816e64.rmeta --extern linefeed=/opt/rustwide/target/debug/deps/liblinefeed-ca4aec71696494f4.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9d9cfe7910b98ce8f5a73651b7fe6f01538cee191d86a979e40cc1dc3eb52183", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d9cfe7910b98ce8f5a73651b7fe6f01538cee191d86a979e40cc1dc3eb52183", kill_on_drop: false }`
[INFO] [stdout] 9d9cfe7910b98ce8f5a73651b7fe6f01538cee191d86a979e40cc1dc3eb52183
