[INFO] fetching crate tuifw-screen-base 0.8.1...
[INFO] documenting tuifw-screen-base-0.8.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate tuifw-screen-base 0.8.1 into /workspace/builds/worker-37/source
[INFO] validating manifest of crates.io crate tuifw-screen-base 0.8.1 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 tuifw-screen-base 0.8.1
[INFO] finished tweaking crates.io crate tuifw-screen-base 0.8.1
[INFO] tweaked toml for crates.io crate tuifw-screen-base 0.8.1 written to /workspace/builds/worker-37/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-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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] 45c9bcc05efcfe2183085aadad2d44682dc0fa49e2a9bf2f82e5a8e1f889920e
[INFO] running `Command { std: "docker" "start" "-a" "45c9bcc05efcfe2183085aadad2d44682dc0fa49e2a9bf2f82e5a8e1f889920e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45c9bcc05efcfe2183085aadad2d44682dc0fa49e2a9bf2f82e5a8e1f889920e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45c9bcc05efcfe2183085aadad2d44682dc0fa49e2a9bf2f82e5a8e1f889920e", kill_on_drop: false }`
[INFO] [stdout] 45c9bcc05efcfe2183085aadad2d44682dc0fa49e2a9bf2f82e5a8e1f889920e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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] f9a2f7b4bf05f08b5900a47475499852567b3394887a8c061221fc230dfd81cf
[INFO] running `Command { std: "docker" "start" "-a" "f9a2f7b4bf05f08b5900a47475499852567b3394887a8c061221fc230dfd81cf", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking enum-derive-2018 v1.0.2
[INFO] [stderr]     Checking macro-attr-2018 v1.1.1
[INFO] [stderr]  Documenting tuifw-screen-base v0.8.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn)]
[INFO] [stdout]   |            ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `tuifw-screen-base`
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(const_panic)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name tuifw_screen_base 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 bitflags=/opt/rustwide/target/debug/deps/libbitflags-c759f8d07719039e.rmeta --extern either=/opt/rustwide/target/debug/deps/libeither-e45356c42fa16998.rmeta --extern enum_derive_2018=/opt/rustwide/target/debug/deps/libenum_derive_2018-1e5747881aa621a1.rmeta --extern macro_attr_2018=/opt/rustwide/target/debug/deps/libmacro_attr_2018-6688928b7b0b436a.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-58aff527fd904a24.rmeta --cap-lints=warn --crate-version 0.8.1` (exit status: 1)
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f9a2f7b4bf05f08b5900a47475499852567b3394887a8c061221fc230dfd81cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9a2f7b4bf05f08b5900a47475499852567b3394887a8c061221fc230dfd81cf", kill_on_drop: false }`
[INFO] [stdout] f9a2f7b4bf05f08b5900a47475499852567b3394887a8c061221fc230dfd81cf
