[INFO] fetching crate iso 0.0.3...
[INFO] testing iso-0.0.3 against 1.59.0 for beta-1.60-1
[INFO] extracting crate iso 0.0.3 into /workspace/builds/worker-41/source
[INFO] validating manifest of crates.io crate iso 0.0.3 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iso 0.0.3
[INFO] finished tweaking crates.io crate iso 0.0.3
[INFO] tweaked toml for crates.io crate iso 0.0.3 written to /workspace/builds/worker-41/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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-41/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2023341d01df5828c417b404123998df6427dce124697c04924121996b66f7c5
[INFO] running `Command { std: "docker" "start" "-a" "2023341d01df5828c417b404123998df6427dce124697c04924121996b66f7c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2023341d01df5828c417b404123998df6427dce124697c04924121996b66f7c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2023341d01df5828c417b404123998df6427dce124697c04924121996b66f7c5", kill_on_drop: false }`
[INFO] [stdout] 2023341d01df5828c417b404123998df6427dce124697c04924121996b66f7c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ad6168fbe5adb0b2cd6a8cd88e453bd56609ce2f6b178d06119950a1de42344b
[INFO] running `Command { std: "docker" "start" "-a" "ad6168fbe5adb0b2cd6a8cd88e453bd56609ce2f6b178d06119950a1de42344b", kill_on_drop: false }`
[INFO] [stderr]    Compiling iso-macro v0.0.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/iso-macro-0.0.2/src/lib.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | #![feature(proc_macro_diagnostic)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[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 `iso-macro` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ad6168fbe5adb0b2cd6a8cd88e453bd56609ce2f6b178d06119950a1de42344b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad6168fbe5adb0b2cd6a8cd88e453bd56609ce2f6b178d06119950a1de42344b", kill_on_drop: false }`
[INFO] [stdout] ad6168fbe5adb0b2cd6a8cd88e453bd56609ce2f6b178d06119950a1de42344b