[INFO] fetching crate pi_async 0.5.16...
[INFO] testing pi_async-0.5.16 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate pi_async 0.5.16 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate pi_async 0.5.16
[INFO] finished tweaking crates.io crate pi_async 0.5.16
[INFO] tweaked toml for crates.io crate pi_async 0.5.16 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pi_async 0.5.16 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 132 packages to latest compatible versions
[INFO] [stderr]       Adding dashmap v3.11.10 (available: v6.1.0)
[INFO] [stderr]       Adding env_logger v0.7.1 (available: v0.11.10)
[INFO] [stderr]       Adding flume v0.10.14 (available: v0.12.0)
[INFO] [stderr]       Adding pi_cancel_timer v0.2.1 (available: v0.3.3)
[INFO] [stderr]       Adding pi_time v0.3.4 (available: v0.5.2)
[INFO] [stderr]       Adding rand v0.7.3 (available: v0.10.1)
[INFO] [stderr]       Adding twox-hash v1.6.3 (available: v2.1.2)
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 467cad5fc5959579ba647b1ba05fd5a4ebbd6a5addfcbe4ec31f5aac7181d7ea
[INFO] running `Command { std: "docker" "start" "-a" "467cad5fc5959579ba647b1ba05fd5a4ebbd6a5addfcbe4ec31f5aac7181d7ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "467cad5fc5959579ba647b1ba05fd5a4ebbd6a5addfcbe4ec31f5aac7181d7ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "467cad5fc5959579ba647b1ba05fd5a4ebbd6a5addfcbe4ec31f5aac7181d7ea", kill_on_drop: false }`
[INFO] [stdout] 467cad5fc5959579ba647b1ba05fd5a4ebbd6a5addfcbe4ec31f5aac7181d7ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] ab8a1e0d6c13ed14fa480233adf5e511cf7b9622f335c879818bd0b81e9ed01a
[INFO] running `Command { std: "docker" "start" "-a" "ab8a1e0d6c13ed14fa480233adf5e511cf7b9622f335c879818bd0b81e9ed01a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling getrandom v0.2.17
[INFO] [stderr]    Compiling object v0.37.3
[INFO] [stderr]    Compiling slab v0.4.12
[INFO] [stderr]    Compiling slotmap v1.1.1
[INFO] [stderr]    Compiling futures-channel v0.3.32
[INFO] [stderr]    Compiling gimli v0.32.3
[INFO] [stderr]    Compiling adler2 v2.0.1
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling parking_lot_core v0.9.12
[INFO] [stderr]    Compiling rustc-demangle v0.1.27
[INFO] [stderr]    Compiling pi_ext_heap v0.1.1
[INFO] [stderr]    Compiling num_cpus v1.17.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling crossbeam-channel v0.5.15
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/pi_ext_heap-0.1.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(min_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 `pi_ext_heap` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ab8a1e0d6c13ed14fa480233adf5e511cf7b9622f335c879818bd0b81e9ed01a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab8a1e0d6c13ed14fa480233adf5e511cf7b9622f335c879818bd0b81e9ed01a", kill_on_drop: false }`
[INFO] [stdout] ab8a1e0d6c13ed14fa480233adf5e511cf7b9622f335c879818bd0b81e9ed01a
