[INFO] fetching crate procss 0.1.18...
[INFO] testing procss-0.1.18 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate procss 0.1.18 into /workspace/builds/worker-5-tc2/source
[INFO] removed /workspace/builds/worker-5-tc2/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-5-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate procss 0.1.18
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate procss 0.1.18
[INFO] tweaked toml for crates.io crate procss 0.1.18 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate procss 0.1.18 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 crates.io crate procss 0.1.18 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] f881cc6ae45d63ffd326090cf082e38a72cb779d43af470546ad35dbb2826450
[INFO] running `Command { std: "docker" "start" "-a" "f881cc6ae45d63ffd326090cf082e38a72cb779d43af470546ad35dbb2826450", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f881cc6ae45d63ffd326090cf082e38a72cb779d43af470546ad35dbb2826450", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f881cc6ae45d63ffd326090cf082e38a72cb779d43af470546ad35dbb2826450", kill_on_drop: false }`
[INFO] [stdout] f881cc6ae45d63ffd326090cf082e38a72cb779d43af470546ad35dbb2826450
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 1f676f9d24d15c7d2ca111086143325e30c86cd5f8069096cc785ea5791fc7ae
[INFO] running `Command { std: "docker" "start" "-a" "1f676f9d24d15c7d2ca111086143325e30c86cd5f8069096cc785ea5791fc7ae", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling unicode-ident v1.0.23
[INFO] [stderr]    Compiling quote v1.0.44
[INFO] [stderr]    Compiling mockall_derive v0.14.0
[INFO] [stderr]    Compiling predicates-core v1.0.10
[INFO] [stderr]    Compiling termtree v0.5.1
[INFO] [stderr]    Compiling anstyle v1.0.13
[INFO] [stderr]    Compiling anyhow v1.0.101
[INFO] [stderr]    Compiling mockall v0.14.0
[INFO] [stderr]    Compiling cfg-if v1.0.4
[INFO] [stderr]    Compiling memchr v2.8.0
[INFO] [stderr]    Compiling downcast v0.11.0
[INFO] [stderr]    Compiling fragile v2.0.1
[INFO] [stderr]    Compiling minimal-lexical v0.2.1
[INFO] [stderr]    Compiling base64 v0.22.1
[INFO] [stderr]    Compiling predicates-tree v1.0.13
[INFO] [stderr]    Compiling predicates v3.1.4
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling syn v2.0.115
[INFO] [stderr]    Compiling procss v0.1.18 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:80:1
[INFO] [stdout]    |
[INFO] [stdout] 80 | #![feature(assert_matches)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `assert_matches` has been stable since 1.95.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | #![feature(assert_matches)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_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 `procss` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "1f676f9d24d15c7d2ca111086143325e30c86cd5f8069096cc785ea5791fc7ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f676f9d24d15c7d2ca111086143325e30c86cd5f8069096cc785ea5791fc7ae", kill_on_drop: false }`
[INFO] [stdout] 1f676f9d24d15c7d2ca111086143325e30c86cd5f8069096cc785ea5791fc7ae
