[INFO] fetching crate zerogc-derive 0.2.0-alpha.5...
[INFO] checking zerogc-derive-0.2.0-alpha.5 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate zerogc-derive 0.2.0-alpha.5 into /workspace/builds/worker-68/source
[INFO] validating manifest of crates.io crate zerogc-derive 0.2.0-alpha.5 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate zerogc-derive 0.2.0-alpha.5
[INFO] finished tweaking crates.io crate zerogc-derive 0.2.0-alpha.5
[INFO] tweaked toml for crates.io crate zerogc-derive 0.2.0-alpha.5 written to /workspace/builds/worker-68/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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-68/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-68/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d4898be508f7cf25b22c16bc97a26e58edf00a2276cb52924d7764d77b278937
[INFO] running `Command { std: "docker" "start" "-a" "d4898be508f7cf25b22c16bc97a26e58edf00a2276cb52924d7764d77b278937", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4898be508f7cf25b22c16bc97a26e58edf00a2276cb52924d7764d77b278937", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4898be508f7cf25b22c16bc97a26e58edf00a2276cb52924d7764d77b278937", kill_on_drop: false }`
[INFO] [stdout] d4898be508f7cf25b22c16bc97a26e58edf00a2276cb52924d7764d77b278937
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-68/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-68/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=forbid" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aad2fe9be42a66423c0bb44a4e9eefae3808a2e4e17f6e74480caa96dec09fd2
[INFO] running `Command { std: "docker" "start" "-a" "aad2fe9be42a66423c0bb44a4e9eefae3808a2e4e17f6e74480caa96dec09fd2", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]     Checking unicode-xid v0.2.2
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking proc-macro2 v1.0.29
[INFO] [stderr]     Checking quote v1.0.9
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling proc-macro-kwargs-derive v0.1.5
[INFO] [stderr]    Compiling proc-macro-kwargs v0.1.5
[INFO] [stderr]     Checking zerogc-derive v0.2.0-alpha.5 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling zerogc-derive v0.2.0-alpha.5
[INFO] [stdout] warning: field is never read: `brace`
[INFO] [stdout]    --> src/macros.rs:428:5
[INFO] [stdout]     |
[INFO] [stdout] 428 |     brace: ::syn::token::Brace
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `brace`
[INFO] [stdout]    --> src/macros.rs:428:5
[INFO] [stdout]     |
[INFO] [stdout] 428 |     brace: ::syn::token::Brace
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking zerogc v0.2.0-alpha.5
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `brace`
[INFO] [stdout]    --> src/macros.rs:428:5
[INFO] [stdout]     |
[INFO] [stdout] 428 |     brace: ::syn::token::Brace
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.77s
[INFO] running `Command { std: "docker" "inspect" "aad2fe9be42a66423c0bb44a4e9eefae3808a2e4e17f6e74480caa96dec09fd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aad2fe9be42a66423c0bb44a4e9eefae3808a2e4e17f6e74480caa96dec09fd2", kill_on_drop: false }`
[INFO] [stdout] aad2fe9be42a66423c0bb44a4e9eefae3808a2e4e17f6e74480caa96dec09fd2