[INFO] fetching crate jam_derive 0.0.1...
[INFO] testing jam_derive-0.0.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate jam_derive 0.0.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate jam_derive 0.0.1 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 jam_derive 0.0.1
[INFO] finished tweaking crates.io crate jam_derive 0.0.1
[INFO] tweaked toml for crates.io crate jam_derive 0.0.1 written to /workspace/builds/worker-5/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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] b2517c72b5c166f9eddcf6724ed82535a819574cf9ad5546f7a7fb03755c56bc
[INFO] running `Command { std: "docker" "start" "-a" "b2517c72b5c166f9eddcf6724ed82535a819574cf9ad5546f7a7fb03755c56bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2517c72b5c166f9eddcf6724ed82535a819574cf9ad5546f7a7fb03755c56bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2517c72b5c166f9eddcf6724ed82535a819574cf9ad5546f7a7fb03755c56bc", kill_on_drop: false }`
[INFO] [stdout] b2517c72b5c166f9eddcf6724ed82535a819574cf9ad5546f7a7fb03755c56bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 9ab63cfefe447dbc1b87438ffa0883836c8d5cf6abd039237a41e4f4d7d8d517
[INFO] running `Command { std: "docker" "start" "-a" "9ab63cfefe447dbc1b87438ffa0883836c8d5cf6abd039237a41e4f4d7d8d517", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling jam_derive v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:34:1
[INFO] [stdout]    |
[INFO] [stdout] 34 | #![feature(proc_macro, proc_macro_lib)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Item`, `parse_items`
[INFO] [stdout]   --> src/lib.rs:46:11
[INFO] [stdout]    |
[INFO] [stdout] 46 | use syn::{Item, parse_items};
[INFO] [stdout]    |           ^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenTree`
[INFO] [stdout]   --> src/lib.rs:47:18
[INFO] [stdout]    |
[INFO] [stdout] 47 | use syn::{Field, TokenTree, Variant, Ident, ItemKind, VariantData, Ty, Pat, Mutability, BindingMode};
[INFO] [stdout]    |                  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `jam_derive` due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "9ab63cfefe447dbc1b87438ffa0883836c8d5cf6abd039237a41e4f4d7d8d517", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ab63cfefe447dbc1b87438ffa0883836c8d5cf6abd039237a41e4f4d7d8d517", kill_on_drop: false }`
[INFO] [stdout] 9ab63cfefe447dbc1b87438ffa0883836c8d5cf6abd039237a41e4f4d7d8d517