[INFO] fetching crate disc-derive 0.1.0...
[INFO] testing disc-derive-0.1.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate disc-derive 0.1.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate disc-derive 0.1.0
[INFO] finished tweaking crates.io crate disc-derive 0.1.0
[INFO] tweaked toml for crates.io crate disc-derive 0.1.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate disc-derive 0.1.0 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 13 packages to latest compatible versions
[INFO] [stderr]       Adding proc-macro-crate v1.3.1 (available: v3.4.0)
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.106)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8156efc4e542f76e1ad8d615116c9e2a9dd4f99c8593e967107d1d26b6dbf87b
[INFO] running `Command { std: "docker" "start" "-a" "8156efc4e542f76e1ad8d615116c9e2a9dd4f99c8593e967107d1d26b6dbf87b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8156efc4e542f76e1ad8d615116c9e2a9dd4f99c8593e967107d1d26b6dbf87b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8156efc4e542f76e1ad8d615116c9e2a9dd4f99c8593e967107d1d26b6dbf87b", kill_on_drop: false }`
[INFO] [stdout] 8156efc4e542f76e1ad8d615116c9e2a9dd4f99c8593e967107d1d26b6dbf87b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8539bb3a5b5b14249d29ad44f3cc63eb556e1278992c5efa02496ac694a18d05
[INFO] running `Command { std: "docker" "start" "-a" "8539bb3a5b5b14249d29ad44f3cc63eb556e1278992c5efa02496ac694a18d05", kill_on_drop: false }`
[INFO] [stderr]    Compiling hashbrown v0.16.0
[INFO] [stderr]    Compiling equivalent v1.0.2
[INFO] [stderr]    Compiling winnow v0.5.40
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling indexmap v2.11.4
[INFO] [stderr]    Compiling toml_edit v0.19.15
[INFO] [stderr]    Compiling proc-macro-crate v1.3.1
[INFO] [stderr]    Compiling disc-derive v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_diagnostic)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `disc-derive` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "8539bb3a5b5b14249d29ad44f3cc63eb556e1278992c5efa02496ac694a18d05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8539bb3a5b5b14249d29ad44f3cc63eb556e1278992c5efa02496ac694a18d05", kill_on_drop: false }`
[INFO] [stdout] 8539bb3a5b5b14249d29ad44f3cc63eb556e1278992c5efa02496ac694a18d05