[INFO] fetching crate papito_codegen 0.1.1...
[INFO] testing papito_codegen-0.1.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate papito_codegen 0.1.1 into /workspace/builds/worker-56/source
[INFO] validating manifest of crates.io crate papito_codegen 0.1.1 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 papito_codegen 0.1.1
[INFO] finished tweaking crates.io crate papito_codegen 0.1.1
[INFO] tweaked toml for crates.io crate papito_codegen 0.1.1 written to /workspace/builds/worker-56/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded papito v0.1.1
[INFO] [stderr]   Downloaded papito_dom v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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] a4c1a25c7d89503bd67ab2e2747668a1a930b9df41d52ba5f5ac6af621325112
[INFO] running `Command { std: "docker" "start" "-a" "a4c1a25c7d89503bd67ab2e2747668a1a930b9df41d52ba5f5ac6af621325112", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a4c1a25c7d89503bd67ab2e2747668a1a930b9df41d52ba5f5ac6af621325112", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4c1a25c7d89503bd67ab2e2747668a1a930b9df41d52ba5f5ac6af621325112", kill_on_drop: false }`
[INFO] [stdout] a4c1a25c7d89503bd67ab2e2747668a1a930b9df41d52ba5f5ac6af621325112
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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] c17f46ab1dd3061a7587d7736e3c3efbf2897f5ac0deee48020310ed21742c80
[INFO] running `Command { std: "docker" "start" "-a" "c17f46ab1dd3061a7587d7736e3c3efbf2897f5ac0deee48020310ed21742c80", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling proc-macro2 v0.2.3
[INFO] [stderr]    Compiling quote v0.4.2
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]    Compiling papito_codegen v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[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] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `papito_codegen` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c17f46ab1dd3061a7587d7736e3c3efbf2897f5ac0deee48020310ed21742c80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c17f46ab1dd3061a7587d7736e3c3efbf2897f5ac0deee48020310ed21742c80", kill_on_drop: false }`
[INFO] [stdout] c17f46ab1dd3061a7587d7736e3c3efbf2897f5ac0deee48020310ed21742c80