[INFO] fetching crate oasis-cbor-derive 0.5.1...
[INFO] testing oasis-cbor-derive-0.5.1 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate oasis-cbor-derive 0.5.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate oasis-cbor-derive 0.5.1
[INFO] finished tweaking crates.io crate oasis-cbor-derive 0.5.1
[INFO] tweaked toml for crates.io crate oasis-cbor-derive 0.5.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate oasis-cbor-derive 0.5.1 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "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-2025-10-28" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 20 packages to latest compatible versions
[INFO] [stderr]       Adding darling v0.14.4 (available: v0.21.3)
[INFO] [stderr]       Adding proc-macro-crate v1.3.1 (available: v3.4.0)
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.108)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eef08f40c5e5e30785f76bdc3274df00b0c6a009c489f93b4ea26899f1140dd2
[INFO] running `Command { std: "docker" "start" "-a" "eef08f40c5e5e30785f76bdc3274df00b0c6a009c489f93b4ea26899f1140dd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eef08f40c5e5e30785f76bdc3274df00b0c6a009c489f93b4ea26899f1140dd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eef08f40c5e5e30785f76bdc3274df00b0c6a009c489f93b4ea26899f1140dd2", kill_on_drop: false }`
[INFO] [stdout] eef08f40c5e5e30785f76bdc3274df00b0c6a009c489f93b4ea26899f1140dd2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 029c94babc9da7e7e9c9fcac8e45ea2d87c2ac78d04d2882907103b9d6bffeef
[INFO] running `Command { std: "docker" "start" "-a" "029c94babc9da7e7e9c9fcac8e45ea2d87c2ac78d04d2882907103b9d6bffeef", kill_on_drop: false }`
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling strsim v0.10.0
[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 oasis-cbor-value v0.5.1
[INFO] [stderr]    Compiling darling_core v0.14.4
[INFO] [stderr]    Compiling indexmap v2.12.0
[INFO] [stderr]    Compiling darling_macro v0.14.4
[INFO] [stderr]    Compiling toml_edit v0.19.15
[INFO] [stderr]    Compiling darling v0.14.4
[INFO] [stderr]    Compiling proc-macro-crate v1.3.1
[INFO] [stderr]    Compiling oasis-cbor-derive v0.5.1 (/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 `oasis-cbor-derive` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "029c94babc9da7e7e9c9fcac8e45ea2d87c2ac78d04d2882907103b9d6bffeef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "029c94babc9da7e7e9c9fcac8e45ea2d87c2ac78d04d2882907103b9d6bffeef", kill_on_drop: false }`
[INFO] [stdout] 029c94babc9da7e7e9c9fcac8e45ea2d87c2ac78d04d2882907103b9d6bffeef
