[INFO] fetching crate rtest-derive 0.2.0...
[INFO] testing rtest-derive-0.2.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate rtest-derive 0.2.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate rtest-derive 0.2.0
[INFO] finished tweaking crates.io crate rtest-derive 0.2.0
[INFO] tweaked toml for crates.io crate rtest-derive 0.2.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rtest-derive 0.2.0 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 11 packages to latest compatible versions
[INFO] [stderr]       Adding darling v0.20.11 (available: v0.23.0)
[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] cc5d86644099ffb0a5bb7ef969bac06700827adfe88f0f28f9331ed9191b207b
[INFO] running `Command { std: "docker" "start" "-a" "cc5d86644099ffb0a5bb7ef969bac06700827adfe88f0f28f9331ed9191b207b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cc5d86644099ffb0a5bb7ef969bac06700827adfe88f0f28f9331ed9191b207b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc5d86644099ffb0a5bb7ef969bac06700827adfe88f0f28f9331ed9191b207b", kill_on_drop: false }`
[INFO] [stdout] cc5d86644099ffb0a5bb7ef969bac06700827adfe88f0f28f9331ed9191b207b
[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] e621fde0cf8a012fae2d9aff7fa3846059cbfc874bedebde23c806f810769179
[INFO] running `Command { std: "docker" "start" "-a" "e621fde0cf8a012fae2d9aff7fa3846059cbfc874bedebde23c806f810769179", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling darling_core v0.20.11
[INFO] [stderr]    Compiling darling_macro v0.20.11
[INFO] [stderr]    Compiling darling v0.20.11
[INFO] [stderr]    Compiling rtest-util v0.2.0
[INFO] [stdout] error[E0433]: cannot find `syn` in the crate root
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rtest-util-0.2.0/src/lib.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub module:      Option<String>,
[INFO] [stdout]   |                      ^^^^^^ could not find `syn` in the list of imported crates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `syn` in the crate root
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rtest-util-0.2.0/src/lib.rs:13:22
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub group:       Option<String>,
[INFO] [stdout]    |                      ^^^^^^ could not find `syn` in the list of imported crates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `syn` in the crate root
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rtest-util-0.2.0/src/lib.rs:15:22
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub cost:        Option<u32>,
[INFO] [stdout]    |                      ^^^^^^ could not find `syn` in the list of imported crates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `syn` in the crate root
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rtest-util-0.2.0/src/lib.rs:17:22
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub responsible: Option<String>,
[INFO] [stdout]    |                      ^^^^^^ could not find `syn` in the list of imported crates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `syn` in the crate root
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rtest-util-0.2.0/src/lib.rs:23:22
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub optional:    bool,
[INFO] [stdout]    |                      ^^^^ could not find `syn` in the list of imported crates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rtest-util` (lib) due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "e621fde0cf8a012fae2d9aff7fa3846059cbfc874bedebde23c806f810769179", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e621fde0cf8a012fae2d9aff7fa3846059cbfc874bedebde23c806f810769179", kill_on_drop: false }`
[INFO] [stdout] e621fde0cf8a012fae2d9aff7fa3846059cbfc874bedebde23c806f810769179
