[INFO] fetching crate x0 0.1.0...
[INFO] testing x0-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate x0 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate x0 0.1.0
[INFO] finished tweaking crates.io crate x0 0.1.0
[INFO] tweaked toml for crates.io crate x0 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate x0 0.1.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 133 packages to latest compatible versions
[INFO] [stderr]       Adding cookie-factory v0.3.2 (available: v0.3.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fred-macros v0.1.0
[INFO] [stderr]   Downloaded xkv v0.1.49
[INFO] [stderr]   Downloaded linkme v0.3.35
[INFO] [stderr]   Downloaded sha-1 v0.10.1
[INFO] [stderr]   Downloaded aok v0.1.17
[INFO] [stderr]   Downloaded cookie-factory v0.3.2
[INFO] [stderr]   Downloaded linkme-impl v0.3.35
[INFO] [stderr]   Downloaded redis-protocol v6.0.0
[INFO] [stderr]   Downloaded fred v10.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 276dc3bcd8ab6d9010f82edda6df1cc7ca68bd1394fe8155e2ba905c2163ac7f
[INFO] running `Command { std: "docker" "start" "-a" "276dc3bcd8ab6d9010f82edda6df1cc7ca68bd1394fe8155e2ba905c2163ac7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "276dc3bcd8ab6d9010f82edda6df1cc7ca68bd1394fe8155e2ba905c2163ac7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "276dc3bcd8ab6d9010f82edda6df1cc7ca68bd1394fe8155e2ba905c2163ac7f", kill_on_drop: false }`
[INFO] [stdout] 276dc3bcd8ab6d9010f82edda6df1cc7ca68bd1394fe8155e2ba905c2163ac7f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f410e6490fa532941380190c8b93143b3ebabd865a297941bf112e137600ee28
[INFO] running `Command { std: "docker" "start" "-a" "f410e6490fa532941380190c8b93143b3ebabd865a297941bf112e137600ee28", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling mio v1.0.4
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling socket2 v0.6.0
[INFO] [stderr]    Compiling crc16 v0.4.0
[INFO] [stderr]    Compiling zeroize v1.8.2
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling rustls-pki-types v1.12.0
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rustls v0.23.32
[INFO] [stderr]    Compiling percent-encoding v2.3.2
[INFO] [stderr]    Compiling icu_normalizer v2.0.0
[INFO] [stderr]    Compiling linkme-impl v0.3.35
[INFO] [stderr]    Compiling tokio v1.47.1
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rustls-webpki v0.103.6
[INFO] [stderr]    Compiling bytes-utils v0.1.4
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling form_urlencoded v1.2.2
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling idna_adapter v1.2.1
[INFO] [stderr]    Compiling idna v1.1.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.11
[INFO] [stderr]    Compiling linkme v0.3.35
[INFO] [stderr]    Compiling cookie-factory v0.3.2
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling sha-1 v0.10.1
[INFO] [stderr]    Compiling float-cmp v0.10.0
[INFO] [stderr]    Compiling parking_lot v0.12.4
[INFO] [stderr]    Compiling url v2.5.7
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling redis-protocol v6.0.0
[INFO] [stderr]    Compiling fred-macros v0.1.0
[INFO] [stderr]    Compiling socket2 v0.5.10
[INFO] [stderr]    Compiling urlencoding v2.1.3
[INFO] [stderr]    Compiling semver v1.0.27
[INFO] [stderr]    Compiling aok v0.1.17
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling futures v0.3.31
[INFO] [stderr]    Compiling tokio-util v0.7.16
[INFO] [stderr]    Compiling tokio-stream v0.1.17
[INFO] [stderr]    Compiling fred v10.1.0
[INFO] [stderr]    Compiling xkv v0.1.49
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/xkv-0.1.49/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(doc_cfg)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/xkv-0.1.49/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(macro_metavar_expr)]
[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 `xkv` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "f410e6490fa532941380190c8b93143b3ebabd865a297941bf112e137600ee28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f410e6490fa532941380190c8b93143b3ebabd865a297941bf112e137600ee28", kill_on_drop: false }`
[INFO] [stdout] f410e6490fa532941380190c8b93143b3ebabd865a297941bf112e137600ee28