[INFO] fetching crate pros-math 0.1.1...
[INFO] testing pros-math-0.1.1 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate pros-math 0.1.1 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate pros-math 0.1.1
[INFO] finished tweaking crates.io crate pros-math 0.1.1
[INFO] tweaked toml for crates.io crate pros-math 0.1.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pros-math 0.1.1 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]      Locking 26 packages to latest compatible versions
[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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 6274cfc550fbf8ef877c6b165d5bc725ae952b4674e3e6d307af01407c815212
[INFO] running `Command { std: "docker" "start" "-a" "6274cfc550fbf8ef877c6b165d5bc725ae952b4674e3e6d307af01407c815212", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6274cfc550fbf8ef877c6b165d5bc725ae952b4674e3e6d307af01407c815212", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6274cfc550fbf8ef877c6b165d5bc725ae952b4674e3e6d307af01407c815212", kill_on_drop: false }`
[INFO] [stdout] 6274cfc550fbf8ef877c6b165d5bc725ae952b4674e3e6d307af01407c815212
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 0e2c133f9160fbe990bcd1ed51773a859973b6a3729a6612f54ac0eaba9a01f0
[INFO] running `Command { std: "docker" "start" "-a" "0e2c133f9160fbe990bcd1ed51773a859973b6a3729a6612f54ac0eaba9a01f0", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling memchr v2.8.0
[INFO] [stderr]    Compiling pros-sys v0.8.1
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling no_std_io v0.6.0
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling num-iter v0.1.45
[INFO] [stderr]    Compiling num v0.4.3
[INFO] [stderr]    Compiling snafu-derive v0.8.9
[INFO] [stderr]    Compiling snafu v0.8.9
[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/snafu-0.8.9/src/lib.rs:5:46
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "unstable-core-error", feature(error_in_core))]
[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 `snafu` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "0e2c133f9160fbe990bcd1ed51773a859973b6a3729a6612f54ac0eaba9a01f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e2c133f9160fbe990bcd1ed51773a859973b6a3729a6612f54ac0eaba9a01f0", kill_on_drop: false }`
[INFO] [stdout] 0e2c133f9160fbe990bcd1ed51773a859973b6a3729a6612f54ac0eaba9a01f0
