[INFO] fetching crate transparent 0.4.2...
[INFO] testing transparent-0.4.2 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate transparent 0.4.2 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate transparent 0.4.2
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate transparent 0.4.2
[INFO] tweaked toml for crates.io crate transparent 0.4.2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate transparent 0.4.2 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] crate crates.io crate transparent 0.4.2 already has a lockfile, it will not be regenerated
[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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 962760f12809be7065f5ef966f33575e1e2d45db23ea81c0ebc17543a3737c57
[INFO] running `Command { std: "docker" "start" "-a" "962760f12809be7065f5ef966f33575e1e2d45db23ea81c0ebc17543a3737c57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "962760f12809be7065f5ef966f33575e1e2d45db23ea81c0ebc17543a3737c57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "962760f12809be7065f5ef966f33575e1e2d45db23ea81c0ebc17543a3737c57", kill_on_drop: false }`
[INFO] [stdout] 962760f12809be7065f5ef966f33575e1e2d45db23ea81c0ebc17543a3737c57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 4b81951fbddf3260c14f1f665387e3b027e3a1d16af77f7254814695f892af9d
[INFO] running `Command { std: "docker" "start" "-a" "4b81951fbddf3260c14f1f665387e3b027e3a1d16af77f7254814695f892af9d", kill_on_drop: false }`
[INFO] [stderr]    Compiling transparent v0.4.2 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> build.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(exit_status_error)]
[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 `transparent` (build script) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "4b81951fbddf3260c14f1f665387e3b027e3a1d16af77f7254814695f892af9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b81951fbddf3260c14f1f665387e3b027e3a1d16af77f7254814695f892af9d", kill_on_drop: false }`
[INFO] [stdout] 4b81951fbddf3260c14f1f665387e3b027e3a1d16af77f7254814695f892af9d
