[INFO] cloning repository https://github.com/tuzz/magic_square_of_squares4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tuzz/magic_square_of_squares4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftuzz%2Fmagic_square_of_squares4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftuzz%2Fmagic_square_of_squares4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7d7464e34e8857a222078d850ad9fe1a8682c6f4
[INFO] documenting tuzz/magic_square_of_squares4 against beta-2026-04-21 for beta-1.96-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftuzz%2Fmagic_square_of_squares4" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/tuzz/magic_square_of_squares4
[INFO] finished tweaking git repo https://github.com/tuzz/magic_square_of_squares4
[INFO] tweaked toml for git repo https://github.com/tuzz/magic_square_of_squares4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/tuzz/magic_square_of_squares4 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/tuzz/magic_square_of_squares4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "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 primal v0.3.3
[INFO] [stderr]   Downloaded unicode-ident v1.0.16
[INFO] [stderr]   Downloaded primal-bit v0.3.2
[INFO] [stderr]   Downloaded nohash v0.2.0
[INFO] [stderr]   Downloaded primal-check v0.3.4
[INFO] [stderr]   Downloaded primal-estimate v0.3.3
[INFO] [stderr]   Downloaded serde v1.0.217
[INFO] [stderr]   Downloaded primal-sieve v0.3.7
[INFO] [stderr]   Downloaded serde_derive v1.0.217
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2eeb9c17d01a2d067136b13888c17b911ba1a5a2805abd5096e91906c3609fa4
[INFO] running `Command { std: "docker" "start" "-a" "2eeb9c17d01a2d067136b13888c17b911ba1a5a2805abd5096e91906c3609fa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2eeb9c17d01a2d067136b13888c17b911ba1a5a2805abd5096e91906c3609fa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2eeb9c17d01a2d067136b13888c17b911ba1a5a2805abd5096e91906c3609fa4", kill_on_drop: false }`
[INFO] [stdout] 2eeb9c17d01a2d067136b13888c17b911ba1a5a2805abd5096e91906c3609fa4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d6acd7755b9d8babe7670c258a699d30082a250ed3dc9b794aa2f1f579b4c4ba
[INFO] running `Command { std: "docker" "start" "-a" "d6acd7755b9d8babe7670c258a699d30082a250ed3dc9b794aa2f1f579b4c4ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]    Compiling unicode-ident v1.0.16
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]    Compiling serde v1.0.217
[INFO] [stderr]     Checking hamming v0.1.3
[INFO] [stderr]     Checking smallvec v1.14.0
[INFO] [stderr]     Checking primal-estimate v0.3.3
[INFO] [stderr]     Checking either v1.13.0
[INFO] [stderr]     Checking nohash v0.2.0
[INFO] [stderr]     Checking primal-bit v0.3.2
[INFO] [stderr]     Checking primal-sieve v0.3.7
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]    Compiling syn v2.0.98
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking primal-check v0.3.4
[INFO] [stderr]     Checking primal v0.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.217
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]  Documenting magic_square_of_squares v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(portable_simd)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `magic_square_of_squares`
[INFO] running `Command { std: "docker" "inspect" "d6acd7755b9d8babe7670c258a699d30082a250ed3dc9b794aa2f1f579b4c4ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6acd7755b9d8babe7670c258a699d30082a250ed3dc9b794aa2f1f579b4c4ba", kill_on_drop: false }`
[INFO] [stdout] d6acd7755b9d8babe7670c258a699d30082a250ed3dc9b794aa2f1f579b4c4ba