[INFO] fetching crate tallystick 0.4.3...
[INFO] testing tallystick-0.4.3 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate tallystick 0.4.3 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate tallystick 0.4.3
[INFO] finished tweaking crates.io crate tallystick 0.4.3
[INFO] tweaked toml for crates.io crate tallystick 0.4.3 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tallystick 0.4.3 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 93 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.2.11 (available: v0.8.2)
[INFO] [stderr]       Adding derive_more v0.99.20 (available: v2.1.1)
[INFO] [stderr]       Adding hashbrown v0.11.2 (available: v0.17.0)
[INFO] [stderr]       Adding petgraph v0.6.5 (available: v0.8.3)
[INFO] [stderr]       Adding rand v0.7.3 (available: v0.10.1)
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 4e65f4b9f0b58768659b498dd884e77f731af8f771f9b471c8c90d70cb6e8ed8
[INFO] running `Command { std: "docker" "start" "-a" "4e65f4b9f0b58768659b498dd884e77f731af8f771f9b471c8c90d70cb6e8ed8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e65f4b9f0b58768659b498dd884e77f731af8f771f9b471c8c90d70cb6e8ed8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e65f4b9f0b58768659b498dd884e77f731af8f771f9b471c8c90d70cb6e8ed8", kill_on_drop: false }`
[INFO] [stdout] 4e65f4b9f0b58768659b498dd884e77f731af8f771f9b471c8c90d70cb6e8ed8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b6a8678f66ed3b218ecb1fa8a3fb1d65da8ea54160be36b4521046ae99f4a834
[INFO] running `Command { std: "docker" "start" "-a" "b6a8678f66ed3b218ecb1fa8a3fb1d65da8ea54160be36b4521046ae99f4a834", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling ahash v0.7.8
[INFO] [stderr]    Compiling once_cell v1.21.4
[INFO] [stderr]    Compiling object v0.37.3
[INFO] [stderr]    Compiling fixedbitset v0.4.2
[INFO] [stderr]    Compiling partial-min-max v0.4.0
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling getrandom v0.2.17
[INFO] [stderr]    Compiling petgraph v0.6.5
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling backtrace v0.3.76
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling derive_more v0.99.20
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling tallystick v0.4.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:13:34
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![cfg_attr(feature = "nightly", feature(specialization))]
[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 compile `tallystick` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b6a8678f66ed3b218ecb1fa8a3fb1d65da8ea54160be36b4521046ae99f4a834", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6a8678f66ed3b218ecb1fa8a3fb1d65da8ea54160be36b4521046ae99f4a834", kill_on_drop: false }`
[INFO] [stdout] b6a8678f66ed3b218ecb1fa8a3fb1d65da8ea54160be36b4521046ae99f4a834
