[INFO] fetching crate tuifw-screen-base 0.8.1...
[INFO] documenting tuifw-screen-base-0.8.1 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate tuifw-screen-base 0.8.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate tuifw-screen-base 0.8.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] deaf6c8f90b348281e4ee2da79c2d78db2af21688d32fbbcd1b676619a4c20f3
[INFO] running `Command { std: "docker" "start" "-a" "deaf6c8f90b348281e4ee2da79c2d78db2af21688d32fbbcd1b676619a4c20f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "deaf6c8f90b348281e4ee2da79c2d78db2af21688d32fbbcd1b676619a4c20f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "deaf6c8f90b348281e4ee2da79c2d78db2af21688d32fbbcd1b676619a4c20f3", kill_on_drop: false }`
[INFO] [stdout] deaf6c8f90b348281e4ee2da79c2d78db2af21688d32fbbcd1b676619a4c20f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 973472727c459194f7085cb43c7871cb6d45d940ad811bc350217208c71be7e6
[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" "973472727c459194f7085cb43c7871cb6d45d940ad811bc350217208c71be7e6", kill_on_drop: false }`
[INFO] [stderr]     Checking enum-derive-2018 v1.0.1
[INFO] [stderr]     Checking macro-attr-2018 v1.1.0
[INFO] [stderr]  Documenting tuifw-screen-base v0.8.1 (/opt/rustwide/workdir)
[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] [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] [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] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `tuifw-screen-base`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[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-bb6ec8f28ecded21.rmeta --extern either=/opt/rustwide/target/debug/deps/libeither-faba41f257ffee08.rmeta --extern enum_derive_2018=/opt/rustwide/target/debug/deps/libenum_derive_2018-cb9b5599cfb56cba.rmeta --extern macro_attr_2018=/opt/rustwide/target/debug/deps/libmacro_attr_2018-28e406d1620dda68.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-c2fc14af6b0f0316.rmeta --cap-lints=warn --crate-version 0.8.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "973472727c459194f7085cb43c7871cb6d45d940ad811bc350217208c71be7e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "973472727c459194f7085cb43c7871cb6d45d940ad811bc350217208c71be7e6", kill_on_drop: false }`
[INFO] [stdout] 973472727c459194f7085cb43c7871cb6d45d940ad811bc350217208c71be7e6
