[INFO] fetching crate rem-utils 0.1.1...
[INFO] documenting rem-utils-0.1.1 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate rem-utils 0.1.1 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate rem-utils 0.1.1 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rem-utils 0.1.1
[INFO] finished tweaking crates.io crate rem-utils 0.1.1
[INFO] tweaked toml for crates.io crate rem-utils 0.1.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8a90fcb00662d2fa1e9d3f438fb4d410302493675538a9356ac3c5b11a4c0c0a
[INFO] running `Command { std: "docker" "start" "-a" "8a90fcb00662d2fa1e9d3f438fb4d410302493675538a9356ac3c5b11a4c0c0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8a90fcb00662d2fa1e9d3f438fb4d410302493675538a9356ac3c5b11a4c0c0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a90fcb00662d2fa1e9d3f438fb4d410302493675538a9356ac3c5b11a4c0c0a", kill_on_drop: false }`
[INFO] [stdout] 8a90fcb00662d2fa1e9d3f438fb4d410302493675538a9356ac3c5b11a4c0c0a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd559acb76171268f14eadf967496d7fe4682a9758a479713a93ed69f9344172
[INFO] running `Command { std: "docker" "start" "-a" "fd559acb76171268f14eadf967496d7fe4682a9758a479713a93ed69f9344172", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]     Checking siphasher v0.3.11
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking new_debug_unreachable v1.0.4
[INFO] [stderr]     Checking precomputed-hash v0.1.1
[INFO] [stderr]     Checking ena v0.14.2
[INFO] [stderr]     Checking phf_shared v0.10.0
[INFO] [stderr]     Checking string_cache v0.8.7
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]  Documenting rem-utils v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(box_syntax)]
[INFO] [stdout]   |            ^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: replaced with `#[rustc_box]`
[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 E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `rem-utils`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type lib --crate-name rem_utils src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=8c9a8c54ac31bfe3 -L dependency=/opt/rustwide/target/debug/deps --extern ena=/opt/rustwide/target/debug/deps/libena-80080c9c5e527ce3.rmeta --extern home=/opt/rustwide/target/debug/deps/libhome-186f3e3082302d60.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-91e42ebaf8a62e54.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-d4d560e312c4843b.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-6b73b9e734afc97a.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-d942b03e5e28e0a1.rmeta --extern string_cache=/opt/rustwide/target/debug/deps/libstring_cache-18242814d73dfc3d.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-ed2aa42b24920d4d.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "fd559acb76171268f14eadf967496d7fe4682a9758a479713a93ed69f9344172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd559acb76171268f14eadf967496d7fe4682a9758a479713a93ed69f9344172", kill_on_drop: false }`
[INFO] [stdout] fd559acb76171268f14eadf967496d7fe4682a9758a479713a93ed69f9344172
