[INFO] fetching crate pi_cowlist 0.1.0...
[INFO] testing pi_cowlist-0.1.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate pi_cowlist 0.1.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate pi_cowlist 0.1.0
[INFO] finished tweaking crates.io crate pi_cowlist 0.1.0
[INFO] tweaked toml for crates.io crate pi_cowlist 0.1.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pi_cowlist 0.1.0 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] 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-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] 70f732936bfb9d7f906723244ac27f2d80c81c723d69a14020456b9d3e7ea7b1
[INFO] running `Command { std: "docker" "start" "-a" "70f732936bfb9d7f906723244ac27f2d80c81c723d69a14020456b9d3e7ea7b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70f732936bfb9d7f906723244ac27f2d80c81c723d69a14020456b9d3e7ea7b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70f732936bfb9d7f906723244ac27f2d80c81c723d69a14020456b9d3e7ea7b1", kill_on_drop: false }`
[INFO] [stdout] 70f732936bfb9d7f906723244ac27f2d80c81c723d69a14020456b9d3e7ea7b1
[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] 93ae80e5f5881d0a39b612e2ed3d1bb3ed2cd2c1a37af1cb9d8fa5d8bad38a9d
[INFO] running `Command { std: "docker" "start" "-a" "93ae80e5f5881d0a39b612e2ed3d1bb3ed2cd2c1a37af1cb9d8fa5d8bad38a9d", kill_on_drop: false }`
[INFO] [stderr]    Compiling pi_cowlist v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(core_intrinsics)] 
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(core_intrinsics)] 
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[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_cowlist` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "93ae80e5f5881d0a39b612e2ed3d1bb3ed2cd2c1a37af1cb9d8fa5d8bad38a9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93ae80e5f5881d0a39b612e2ed3d1bb3ed2cd2c1a37af1cb9d8fa5d8bad38a9d", kill_on_drop: false }`
[INFO] [stdout] 93ae80e5f5881d0a39b612e2ed3d1bb3ed2cd2c1a37af1cb9d8fa5d8bad38a9d
