[INFO] fetching crate proofsize_derive 0.1.0...
[INFO] testing proofsize_derive-0.1.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate proofsize_derive 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate proofsize_derive 0.1.0
[INFO] finished tweaking crates.io crate proofsize_derive 0.1.0
[INFO] tweaked toml for crates.io crate proofsize_derive 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate proofsize_derive 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] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 6 packages to latest compatible versions
[INFO] [stderr]       Adding synstructure v0.12.6 (available: v0.13.2)
[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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] ef28193d8bf8a7039e49e38d2b187af358cbe9dd7138eecc83ff8dc4dbbce06f
[INFO] running `Command { std: "docker" "start" "-a" "ef28193d8bf8a7039e49e38d2b187af358cbe9dd7138eecc83ff8dc4dbbce06f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef28193d8bf8a7039e49e38d2b187af358cbe9dd7138eecc83ff8dc4dbbce06f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef28193d8bf8a7039e49e38d2b187af358cbe9dd7138eecc83ff8dc4dbbce06f", kill_on_drop: false }`
[INFO] [stdout] ef28193d8bf8a7039e49e38d2b187af358cbe9dd7138eecc83ff8dc4dbbce06f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 019dc0f60252c443f830c5298bdc4184b9448dec3430b454be77d03207c1e3a9
[INFO] running `Command { std: "docker" "start" "-a" "019dc0f60252c443f830c5298bdc4184b9448dec3430b454be77d03207c1e3a9", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling unicode-ident v1.0.24
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling unicode-xid v0.2.6
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling proofsize_derive v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn derive_proofsize(mut s: synstructure::Structure) -> proc_macro2::TokenStream {
[INFO] [stdout]   |                     ----^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.83s
[INFO] running `Command { std: "docker" "inspect" "019dc0f60252c443f830c5298bdc4184b9448dec3430b454be77d03207c1e3a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "019dc0f60252c443f830c5298bdc4184b9448dec3430b454be77d03207c1e3a9", kill_on_drop: false }`
[INFO] [stdout] 019dc0f60252c443f830c5298bdc4184b9448dec3430b454be77d03207c1e3a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 259ac5a11e6087faaabcf404cdb5b1f299a388078aeb1d24bf6fc3084ba6498c
[INFO] running `Command { std: "docker" "start" "-a" "259ac5a11e6087faaabcf404cdb5b1f299a388078aeb1d24bf6fc3084ba6498c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling unicode-ident v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.6
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling proofsize_derive v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn derive_proofsize(mut s: synstructure::Structure) -> proc_macro2::TokenStream {
[INFO] [stdout]   |                     ----^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn derive_proofsize(mut s: synstructure::Structure) -> proc_macro2::TokenStream {
[INFO] [stdout]   |                     ----^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `rug_binserial`
[INFO] [stdout]   --> tests/test.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 |     #[derive(ProofSize)]
[INFO] [stdout]    |              ^^^^^^^^^ can't find crate
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the derive macro `ProofSize` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proofsize_derive` (test "test") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "259ac5a11e6087faaabcf404cdb5b1f299a388078aeb1d24bf6fc3084ba6498c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "259ac5a11e6087faaabcf404cdb5b1f299a388078aeb1d24bf6fc3084ba6498c", kill_on_drop: false }`
[INFO] [stdout] 259ac5a11e6087faaabcf404cdb5b1f299a388078aeb1d24bf6fc3084ba6498c
