[INFO] fetching crate rust_observable 0.2.1...
[INFO] testing rust_observable-0.2.1 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate rust_observable 0.2.1 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate rust_observable 0.2.1
[INFO] finished tweaking crates.io crate rust_observable 0.2.1
[INFO] tweaked toml for crates.io crate rust_observable 0.2.1 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rust_observable 0.2.1 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 5 packages to latest compatible versions
[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-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1c84d249454ed47d8aadd80e112704b4d685e47db5c59d123031bf3a8f184bf
[INFO] running `Command { std: "docker" "start" "-a" "e1c84d249454ed47d8aadd80e112704b4d685e47db5c59d123031bf3a8f184bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1c84d249454ed47d8aadd80e112704b4d685e47db5c59d123031bf3a8f184bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1c84d249454ed47d8aadd80e112704b4d685e47db5c59d123031bf3a8f184bf", kill_on_drop: false }`
[INFO] [stdout] e1c84d249454ed47d8aadd80e112704b4d685e47db5c59d123031bf3a8f184bf
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1095ff37a17eb0a0f00a1b311c5c9877a0bc26cb6a8f7617e9d61a84f2b57f66
[INFO] running `Command { std: "docker" "start" "-a" "1095ff37a17eb0a0f00a1b311c5c9877a0bc26cb6a8f7617e9d61a84f2b57f66", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling syn v2.0.108
[INFO] [stderr]    Compiling rust_observable_literal v0.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rust_observable_literal-0.1.0/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 `rust_observable_literal` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "1095ff37a17eb0a0f00a1b311c5c9877a0bc26cb6a8f7617e9d61a84f2b57f66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1095ff37a17eb0a0f00a1b311c5c9877a0bc26cb6a8f7617e9d61a84f2b57f66", kill_on_drop: false }`
[INFO] [stdout] 1095ff37a17eb0a0f00a1b311c5c9877a0bc26cb6a8f7617e9d61a84f2b57f66