[INFO] fetching crate rundo 0.4.0...
[INFO] testing rundo-0.4.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate rundo 0.4.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate rundo 0.4.0
[INFO] finished tweaking crates.io crate rundo 0.4.0
[INFO] tweaked toml for crates.io crate rundo 0.4.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rundo 0.4.0 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "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-2026-04-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 68 packages to latest compatible versions
[INFO] [stderr]       Adding bson v0.11.1 (available: v3.1.0)
[INFO] [stderr]       Adding wasi v0.10.0+wasi-snapshot-preview1 (available: v0.10.2+wasi-snapshot-preview1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c67f3e7c57a9dd17e42f600cb281ae4cfe078e3c7aba835f67acb77761690ead
[INFO] running `Command { std: "docker" "start" "-a" "c67f3e7c57a9dd17e42f600cb281ae4cfe078e3c7aba835f67acb77761690ead", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c67f3e7c57a9dd17e42f600cb281ae4cfe078e3c7aba835f67acb77761690ead", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c67f3e7c57a9dd17e42f600cb281ae4cfe078e3c7aba835f67acb77761690ead", kill_on_drop: false }`
[INFO] [stdout] c67f3e7c57a9dd17e42f600cb281ae4cfe078e3c7aba835f67acb77761690ead
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b44ce0d7557cebb42a734f94bc5002ff95f9b9576aa8b70346e9f6d3821a2118
[INFO] running `Command { std: "docker" "start" "-a" "b44ce0d7557cebb42a734f94bc5002ff95f9b9576aa8b70346e9f6d3821a2118", kill_on_drop: false }`
[INFO] [stderr] warning: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling serde_json v1.0.149
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling time v0.1.45
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stderr]    Compiling memchr v2.8.0
[INFO] [stderr]    Compiling rustc-serialize v0.3.25
[INFO] [stderr]    Compiling proc-macro2 v0.2.3
[INFO] [stderr]    Compiling rundo_types v0.4.0
[INFO] [stderr]    Compiling chrono v0.4.44
[INFO] [stderr]    Compiling hostname v0.1.5
[INFO] [stderr]    Compiling quote v0.4.2
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]    Compiling hex v0.2.0
[INFO] [stderr]    Compiling linked-hash-map v0.5.6
[INFO] [stderr]    Compiling rundo_attrs v0.4.0
[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/rundo_attrs-0.4.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![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] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rundo_attrs` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "b44ce0d7557cebb42a734f94bc5002ff95f9b9576aa8b70346e9f6d3821a2118", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b44ce0d7557cebb42a734f94bc5002ff95f9b9576aa8b70346e9f6d3821a2118", kill_on_drop: false }`
[INFO] [stdout] b44ce0d7557cebb42a734f94bc5002ff95f9b9576aa8b70346e9f6d3821a2118
