[INFO] fetching crate tty 0.5.0...
[INFO] documenting tty-0.5.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate tty 0.5.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate tty 0.5.0 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 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-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] c51a93c0a91de8fe7d9b5074aef9a264e4030fd38ef9e7a5a023b4854fd67dfa
[INFO] running `Command { std: "docker" "start" "-a" "c51a93c0a91de8fe7d9b5074aef9a264e4030fd38ef9e7a5a023b4854fd67dfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c51a93c0a91de8fe7d9b5074aef9a264e4030fd38ef9e7a5a023b4854fd67dfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c51a93c0a91de8fe7d9b5074aef9a264e4030fd38ef9e7a5a023b4854fd67dfa", kill_on_drop: false }`
[INFO] [stdout] c51a93c0a91de8fe7d9b5074aef9a264e4030fd38ef9e7a5a023b4854fd67dfa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 1c48f6db59e0ccdd73616f77b7a366cd46d6bc55a13908749d4f2f5376034d5a
[INFO] running `Command { std: "docker" "start" "-a" "1c48f6db59e0ccdd73616f77b7a366cd46d6bc55a13908749d4f2f5376034d5a", kill_on_drop: false }`
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking lazy_static v0.1.16
[INFO] [stderr]     Checking termios v0.2.2
[INFO] [stderr]     Checking fd v0.2.3
[INFO] [stderr]     Checking chan v0.1.23
[INFO] [stderr]     Checking bit-set v0.2.0
[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-3bbb85a7c9bdfdf1.rmeta --extern chan_signal=/opt/rustwide/target/debug/deps/libchan_signal-a206e9bbd991b4a1.rmeta --extern fd=/opt/rustwide/target/debug/deps/libfd-8d4e5ec199b9a3c5.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-d38c567ce4ccc50e.rmeta --extern termios=/opt/rustwide/target/debug/deps/libtermios-aacf7270ab5e68c8.rmeta --cap-lints=warn --crate-version 0.5.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1c48f6db59e0ccdd73616f77b7a366cd46d6bc55a13908749d4f2f5376034d5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c48f6db59e0ccdd73616f77b7a366cd46d6bc55a13908749d4f2f5376034d5a", kill_on_drop: false }`
[INFO] [stdout] 1c48f6db59e0ccdd73616f77b7a366cd46d6bc55a13908749d4f2f5376034d5a