[INFO] fetching crate tty 0.5.0...
[INFO] documenting tty-0.5.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate tty 0.5.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate tty 0.5.0 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 crates.io crate tty 0.5.0
[INFO] finished tweaking crates.io crate tty 0.5.0
[INFO] tweaked toml for crates.io crate tty 0.5.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] acf5026d7da69626e746025d38a0d75414d687860476b20655e57bea75a152d0
[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" "acf5026d7da69626e746025d38a0d75414d687860476b20655e57bea75a152d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "acf5026d7da69626e746025d38a0d75414d687860476b20655e57bea75a152d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "acf5026d7da69626e746025d38a0d75414d687860476b20655e57bea75a152d0", kill_on_drop: false }`
[INFO] [stdout] acf5026d7da69626e746025d38a0d75414d687860476b20655e57bea75a152d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 1ce5a7da938779b9a6aa426448f0cef92f617ecf9196d870d0640776b18cdca9
[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" "1ce5a7da938779b9a6aa426448f0cef92f617ecf9196d870d0640776b18cdca9", kill_on_drop: false }`
[INFO] [stderr]     Checking termios v0.2.2
[INFO] [stderr]     Checking fd v0.2.3
[INFO] [stderr]     Checking chan-signal v0.1.7
[INFO] [stderr]  Documenting tty v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(process_exec)]
[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 `tty`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name tty src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern chan=/opt/rustwide/target/debug/deps/libchan-478ca0460b8ca6c2.rmeta --extern chan_signal=/opt/rustwide/target/debug/deps/libchan_signal-5af497badf4e75a1.rmeta --extern fd=/opt/rustwide/target/debug/deps/libfd-7beb6e14f39b4081.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-1ad3ad1e20beb97f.rmeta --extern termios=/opt/rustwide/target/debug/deps/libtermios-2b15b5f1918c2a63.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "1ce5a7da938779b9a6aa426448f0cef92f617ecf9196d870d0640776b18cdca9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ce5a7da938779b9a6aa426448f0cef92f617ecf9196d870d0640776b18cdca9", kill_on_drop: false }`
[INFO] [stdout] 1ce5a7da938779b9a6aa426448f0cef92f617ecf9196d870d0640776b18cdca9