[INFO] cloning repository https://github.com/algon-320/toyterm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/algon-320/toyterm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falgon-320%2Ftoyterm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falgon-320%2Ftoyterm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a2844a79c059c9f22a94ea5f734a8aa52ba9cc4c
[INFO] documenting algon-320/toyterm 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%2Falgon-320%2Ftoyterm" "/workspace/builds/worker-98/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-98/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/algon-320/toyterm 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/algon-320/toyterm
[INFO] finished tweaking git repo https://github.com/algon-320/toyterm
[INFO] tweaked toml for git repo https://github.com/algon-320/toyterm written to /workspace/builds/worker-98/source/Cargo.toml
[INFO] crate git repo https://github.com/algon-320/toyterm 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded config v0.10.1
[INFO] [stderr]   Downloaded env_logger v0.8.3
[INFO] [stderr]   Downloaded serde v1.0.123
[INFO] [stderr]   Downloaded linked-hash-map v0.3.0
[INFO] [stderr]   Downloaded rust-ini v0.13.0
[INFO] [stderr]   Downloaded const-cstr v0.3.0
[INFO] [stderr]   Downloaded yeslogic-fontconfig-sys v2.11.1
[INFO] [stderr]   Downloaded serde_test v0.8.23
[INFO] [stderr]   Downloaded ucd v0.1.1
[INFO] [stderr]   Downloaded fontconfig v0.2.0
[INFO] [stderr]   Downloaded lexical-core v0.7.5
[INFO] [stderr]   Downloaded libc v0.2.87
[INFO] [stderr]   Downloaded num v0.4.0
[INFO] [stderr]   Downloaded serde-hjson v0.9.1
[INFO] [stderr]   Downloaded nix v0.20.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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] e5735b104187a79776f2cdfc35a04ffdd7e443f00e5d35dae9a1510964200966
[INFO] running `Command { std: "docker" "start" "-a" "e5735b104187a79776f2cdfc35a04ffdd7e443f00e5d35dae9a1510964200966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e5735b104187a79776f2cdfc35a04ffdd7e443f00e5d35dae9a1510964200966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5735b104187a79776f2cdfc35a04ffdd7e443f00e5d35dae9a1510964200966", kill_on_drop: false }`
[INFO] [stdout] e5735b104187a79776f2cdfc35a04ffdd7e443f00e5d35dae9a1510964200966
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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] a97fa83bd2cb96fb49f93f134f0f76845982b3e4e56989569e9d886dcaf69ccb
[INFO] running `Command { std: "docker" "start" "-a" "a97fa83bd2cb96fb49f93f134f0f76845982b3e4e56989569e9d886dcaf69ccb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.87
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling version-compare v0.0.10
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]     Checking regex-syntax v0.6.22
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking const-cstr v0.3.0
[INFO] [stderr]    Compiling sdl2 v0.34.3
[INFO] [stderr]     Checking rust-ini v0.13.0
[INFO] [stderr]     Checking ucd v0.1.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]    Compiling yeslogic-fontconfig-sys v2.11.1
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking serde_json v1.0.64
[INFO] [stderr]    Compiling sdl2-sys v0.34.3
[INFO] [stderr]     Checking sixel v0.1.0 (/opt/rustwide/workdir/sixel)
[INFO] [stderr]     Checking serde_test v0.8.23
[INFO] [stderr]     Checking regex v1.4.3
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking nix v0.20.0
[INFO] [stderr]     Checking fontconfig v0.2.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking serde-hjson v0.9.1
[INFO] [stderr]     Checking env_logger v0.8.3
[INFO] [stderr]     Checking config v0.10.1
[INFO] [stderr]  Documenting toyterm 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(step_trait)]
[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 `toyterm`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name toyterm 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-2bb0455753a8f12d.rmeta --extern config=/opt/rustwide/target/debug/deps/libconfig-3c87ed00018a9207.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-5f845a6c74ac8ffa.rmeta --extern fontconfig=/opt/rustwide/target/debug/deps/libfontconfig-e3ab1e91c827b4fd.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-acd7d23482fe8b54.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-ce43ebb727248a1c.rmeta --extern nix=/opt/rustwide/target/debug/deps/libnix-0f43719e8765c728.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-8ffd581da56e531a.rmeta --extern sdl2=/opt/rustwide/target/debug/deps/libsdl2-bb7c79e6a7f1daf3.rmeta --extern sixel=/opt/rustwide/target/debug/deps/libsixel-c0054bdf20cb2dc6.rmeta --extern ucd=/opt/rustwide/target/debug/deps/libucd-ce97983e6d86c94c.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a97fa83bd2cb96fb49f93f134f0f76845982b3e4e56989569e9d886dcaf69ccb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a97fa83bd2cb96fb49f93f134f0f76845982b3e4e56989569e9d886dcaf69ccb", kill_on_drop: false }`
[INFO] [stdout] a97fa83bd2cb96fb49f93f134f0f76845982b3e4e56989569e9d886dcaf69ccb
