[INFO] fetching crate structdump-derive 0.1.2...
[INFO] testing structdump-derive-0.1.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate structdump-derive 0.1.2 into /workspace/builds/worker-108/source
[INFO] validating manifest of crates.io crate structdump-derive 0.1.2 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate structdump-derive 0.1.2
[INFO] finished tweaking crates.io crate structdump-derive 0.1.2
[INFO] tweaked toml for crates.io crate structdump-derive 0.1.2 written to /workspace/builds/worker-108/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 94b5a40779286376f8878ed31a11a56d32ac72e507b40f68b3c5b95a117ca006
[INFO] running `Command { std: "docker" "start" "-a" "94b5a40779286376f8878ed31a11a56d32ac72e507b40f68b3c5b95a117ca006", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "94b5a40779286376f8878ed31a11a56d32ac72e507b40f68b3c5b95a117ca006", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94b5a40779286376f8878ed31a11a56d32ac72e507b40f68b3c5b95a117ca006", kill_on_drop: false }`
[INFO] [stdout] 94b5a40779286376f8878ed31a11a56d32ac72e507b40f68b3c5b95a117ca006
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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" "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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27fe05c71a4a4e975a8c1eaccfdfdbab6334f916e9ccbef54fd97de8044a22c9
[INFO] running `Command { std: "docker" "start" "-a" "27fe05c71a4a4e975a8c1eaccfdfdbab6334f916e9ccbef54fd97de8044a22c9", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling structdump-derive v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: could not find `export` in `syn`
[INFO] [stdout]   --> src/lib.rs:22:60
[INFO] [stdout]    |
[INFO] [stdout] 22 |                 let name = Ident::new(&format!("f{}", i), syn::export::Span::call_site());
[INFO] [stdout]    |                                                                        ^^^^ not found in `syn::export`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]    |
[INFO] [stdout] 1  | use proc_macro2::Span;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use proc_macro::Span;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use proc_macro::bridge::server::Span;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use quote::__private::Span;
[INFO] [stdout]    |
[INFO] [stdout]      and 1 other candidate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: could not find `export` in `syn`
[INFO] [stdout]   --> src/lib.rs:53:60
[INFO] [stdout]    |
[INFO] [stdout] 53 |                 let name = Ident::new(&format!("f{}", i), syn::export::Span::call_site());
[INFO] [stdout]    |                                                                        ^^^^ not found in `syn::export`
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]    |
[INFO] [stdout] 1  | use proc_macro2::Span;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use proc_macro::Span;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use proc_macro::bridge::server::Span;
[INFO] [stdout]    |
[INFO] [stdout] 1  | use quote::__private::Span;
[INFO] [stdout]    |
[INFO] [stdout]      and 1 other candidate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `structdump-derive` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "27fe05c71a4a4e975a8c1eaccfdfdbab6334f916e9ccbef54fd97de8044a22c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27fe05c71a4a4e975a8c1eaccfdfdbab6334f916e9ccbef54fd97de8044a22c9", kill_on_drop: false }`
[INFO] [stdout] 27fe05c71a4a4e975a8c1eaccfdfdbab6334f916e9ccbef54fd97de8044a22c9