[INFO] fetching crate threadpools 8.0.0...
[INFO] testing threadpools-8.0.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate threadpools 8.0.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate threadpools 8.0.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate threadpools 8.0.0
[INFO] tweaked toml for crates.io crate threadpools 8.0.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate threadpools 8.0.0 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] crate crates.io crate threadpools 8.0.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 759a994ffd12ea19c4793fcc210df84667ef24917aeca408d86ad8a0ea6a2af3
[INFO] running `Command { std: "docker" "start" "-a" "759a994ffd12ea19c4793fcc210df84667ef24917aeca408d86ad8a0ea6a2af3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "759a994ffd12ea19c4793fcc210df84667ef24917aeca408d86ad8a0ea6a2af3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "759a994ffd12ea19c4793fcc210df84667ef24917aeca408d86ad8a0ea6a2af3", kill_on_drop: false }`
[INFO] [stdout] 759a994ffd12ea19c4793fcc210df84667ef24917aeca408d86ad8a0ea6a2af3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] cdc7c54ecdd57dd80637c0a72d5e2b977bc099a13a4a0215bf8fc9187f07ca43
[INFO] running `Command { std: "docker" "start" "-a" "cdc7c54ecdd57dd80637c0a72d5e2b977bc099a13a4a0215bf8fc9187f07ca43", kill_on_drop: false }`
[INFO] [stderr]    Compiling threadpools v8.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(mpmc_channel)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `new_range_api` has been stable since 1.96.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(new_range_api)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0609]: no field `end` on type `std::range::RangeInclusive<usize>`
[INFO] [stdout]    --> src/reduction.rs:161:23
[INFO] [stdout]     |
[INFO] [stdout] 161 |             if left.1.end + 1 == right.1.start {
[INFO] [stdout]     |                       ^^^ unknown field
[INFO] [stdout]     |
[INFO] [stdout]     = note: available fields are: `start`, `last`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0609]: no field `end` on type `std::range::RangeInclusive<usize>`
[INFO] [stdout]    --> src/reduction.rs:188:82
[INFO] [stdout]     |
[INFO] [stdout] 188 | ...                   let combined_range = (left_range.start..=right_range.end).into();
[INFO] [stdout]     |                                                                            ^^^ unknown field
[INFO] [stdout]     |
[INFO] [stdout]     = note: available fields are: `start`, `last`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `least_index` is never read
[INFO] [stdout]    --> src/ordered.rs:165:21
[INFO] [stdout]     |
[INFO] [stdout] 137 |                         least_index += 1;
[INFO] [stdout]     |                         ---------------- `least_index` is overwritten here before the previous value is read
[INFO] [stdout] ...
[INFO] [stdout] 165 |                     least_index += 1;
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0609.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `threadpools` (lib) due to 3 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "cdc7c54ecdd57dd80637c0a72d5e2b977bc099a13a4a0215bf8fc9187f07ca43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdc7c54ecdd57dd80637c0a72d5e2b977bc099a13a4a0215bf8fc9187f07ca43", kill_on_drop: false }`
[INFO] [stdout] cdc7c54ecdd57dd80637c0a72d5e2b977bc099a13a4a0215bf8fc9187f07ca43
