[INFO] fetching crate high_mem_utils 0.2.7...
[INFO] documenting high_mem_utils-0.2.7 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate high_mem_utils 0.2.7 into /workspace/builds/worker-57/source
[INFO] validating manifest of crates.io crate high_mem_utils 0.2.7 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 high_mem_utils 0.2.7
[INFO] finished tweaking crates.io crate high_mem_utils 0.2.7
[INFO] tweaked toml for crates.io crate high_mem_utils 0.2.7 written to /workspace/builds/worker-57/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] [stderr]     Blocking waiting for file lock on package cache
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/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] c6ecb08b544c9bc8bb9c95e8a1eda9c8bb5596f7cff3d05334da512966b52ed1
[INFO] running `Command { std: "docker" "start" "-a" "c6ecb08b544c9bc8bb9c95e8a1eda9c8bb5596f7cff3d05334da512966b52ed1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6ecb08b544c9bc8bb9c95e8a1eda9c8bb5596f7cff3d05334da512966b52ed1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6ecb08b544c9bc8bb9c95e8a1eda9c8bb5596f7cff3d05334da512966b52ed1", kill_on_drop: false }`
[INFO] [stdout] c6ecb08b544c9bc8bb9c95e8a1eda9c8bb5596f7cff3d05334da512966b52ed1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/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] cd1b9557ea2f3e6b5db3cfe5a0c21dd5d6d33a4c1f4e54a7649be77b29a0f0b4
[INFO] running `Command { std: "docker" "start" "-a" "cd1b9557ea2f3e6b5db3cfe5a0c21dd5d6d33a4c1f4e54a7649be77b29a0f0b4", kill_on_drop: false }`
[INFO] [stderr]    Compiling fixed_len_str v0.2.9
[INFO] [stderr]    Compiling syn_str v0.1.58
[INFO] [stderr]    Compiling fast_new_type v0.1.7
[INFO] [stderr]  Documenting high_mem_utils v0.2.7 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:2:39
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(vec_leak, untagged_unions, const_fn, const_fn_union)]
[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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(vec_leak, untagged_unions, const_fn, const_fn_union)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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] [stderr] error: could not document `high_mem_utils`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name high_mem_utils 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 fast_new_type=/opt/rustwide/target/debug/deps/libfast_new_type-49db528914c7722b.so --cap-lints=warn --crate-version 0.2.7` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "cd1b9557ea2f3e6b5db3cfe5a0c21dd5d6d33a4c1f4e54a7649be77b29a0f0b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd1b9557ea2f3e6b5db3cfe5a0c21dd5d6d33a4c1f4e54a7649be77b29a0f0b4", kill_on_drop: false }`
[INFO] [stdout] cd1b9557ea2f3e6b5db3cfe5a0c21dd5d6d33a4c1f4e54a7649be77b29a0f0b4
