[INFO] fetching crate is_positive 0.1.338...
[INFO] testing is_positive-0.1.338 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate is_positive 0.1.338 into /workspace/builds/worker-4-tc2/source
[INFO] removed /workspace/builds/worker-4-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate is_positive 0.1.338
[INFO] finished tweaking crates.io crate is_positive 0.1.338
[INFO] tweaked toml for crates.io crate is_positive 0.1.338 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate is_positive 0.1.338 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "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-2025-09-21" "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-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c457c3b0e4cde26315dda1f452ae9e67cdea398fab5eef5a5b8fe5461e1f941
[INFO] running `Command { std: "docker" "start" "-a" "4c457c3b0e4cde26315dda1f452ae9e67cdea398fab5eef5a5b8fe5461e1f941", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c457c3b0e4cde26315dda1f452ae9e67cdea398fab5eef5a5b8fe5461e1f941", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c457c3b0e4cde26315dda1f452ae9e67cdea398fab5eef5a5b8fe5461e1f941", kill_on_drop: false }`
[INFO] [stdout] 4c457c3b0e4cde26315dda1f452ae9e67cdea398fab5eef5a5b8fe5461e1f941
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 40851455e3910d4f7829bca2b16e52996df5dcb5b7123fb2d849c1678866834e
[INFO] running `Command { std: "docker" "start" "-a" "40851455e3910d4f7829bca2b16e52996df5dcb5b7123fb2d849c1678866834e", kill_on_drop: false }`
[INFO] [stderr]    Compiling is_positive v0.1.338 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(generic_const_exprs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: lifetime may not live long enough
[INFO] [stdout]   --> src/lib.rs:32:20
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn extend_mut<'a, 'b, T>(borrow: &'a mut T) -> &'b mut T {
[INFO] [stdout]    |               --  -- lifetime `'b` defined here
[INFO] [stdout]    |               |
[INFO] [stdout]    |               lifetime `'a` defined here
[INFO] [stdout] 32 |     let converted: fn(&'b &'static (), &'a mut T) -> &'b mut T = weird_fn;
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'b`
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding the following bound: `'a: 'b`
[INFO] [stdout]    = note: requirement occurs because of a mutable reference to `T`
[INFO] [stdout]    = note: mutable references are invariant over their type parameter
[INFO] [stdout]    = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `is_positive` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "40851455e3910d4f7829bca2b16e52996df5dcb5b7123fb2d849c1678866834e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40851455e3910d4f7829bca2b16e52996df5dcb5b7123fb2d849c1678866834e", kill_on_drop: false }`
[INFO] [stdout] 40851455e3910d4f7829bca2b16e52996df5dcb5b7123fb2d849c1678866834e