[INFO] cloning repository https://github.com/fx-kirin/chrono-bincode-bug
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fx-kirin/chrono-bincode-bug" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffx-kirin%2Fchrono-bincode-bug", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffx-kirin%2Fchrono-bincode-bug'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 06b6cd60dd0f9d808c692d15296d22a8349f671d
[INFO] documenting fx-kirin/chrono-bincode-bug against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffx-kirin%2Fchrono-bincode-bug" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fx-kirin/chrono-bincode-bug on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fx-kirin/chrono-bincode-bug
[INFO] finished tweaking git repo https://github.com/fx-kirin/chrono-bincode-bug
[INFO] tweaked toml for git repo https://github.com/fx-kirin/chrono-bincode-bug written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/fx-kirin/chrono-bincode-bug already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e3cf39555f6eaa8777ade30c93bc214a4e1f87f0d50a2f746276fec475d7df2a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e3cf39555f6eaa8777ade30c93bc214a4e1f87f0d50a2f746276fec475d7df2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3cf39555f6eaa8777ade30c93bc214a4e1f87f0d50a2f746276fec475d7df2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3cf39555f6eaa8777ade30c93bc214a4e1f87f0d50a2f746276fec475d7df2a", kill_on_drop: false }`
[INFO] [stdout] e3cf39555f6eaa8777ade30c93bc214a4e1f87f0d50a2f746276fec475d7df2a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 960ea74cfd1a978407e3024f0077d675a2c8ffa669101ec8cc606d6171a3a633
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "960ea74cfd1a978407e3024f0077d675a2c8ffa669101ec8cc606d6171a3a633", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.111
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]     Checking anyhow v1.0.31
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking bincode v1.2.1
[INFO] [stderr]  Documenting chrono-bincode 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(map_first_last)]
[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 `chrono-bincode`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name chrono_bincode 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 anyhow=/opt/rustwide/target/debug/deps/libanyhow-8c061b3ea71c2288.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-4ed63c3cd6577644.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-72f5a58c457ddf58.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-9a58b81c50d28560.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-cc093d4ac641a5f8.so --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "960ea74cfd1a978407e3024f0077d675a2c8ffa669101ec8cc606d6171a3a633", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "960ea74cfd1a978407e3024f0077d675a2c8ffa669101ec8cc606d6171a3a633", kill_on_drop: false }`
[INFO] [stdout] 960ea74cfd1a978407e3024f0077d675a2c8ffa669101ec8cc606d6171a3a633