[INFO] fetching crate x0 0.1.0...
[INFO] testing x0-0.1.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate x0 0.1.0 into /workspace/builds/worker-3-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-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate x0 0.1.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "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" "+1.91.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 136 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bytes-utils v0.1.4
[INFO] [stderr]   Downloaded xkv v0.1.50
[INFO] [stderr]   Downloaded aok v0.1.18
[INFO] [stderr]   Downloaded linkme v0.3.35
[INFO] [stderr]   Downloaded err_exit v0.1.6
[INFO] [stderr]   Downloaded fred-macros v0.1.0
[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-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ac9e4de5fcefb33b82b0a7bea09fd9af310dc63ea4ac5cc5777d2564ba17be12
[INFO] running `Command { std: "docker" "start" "-a" "ac9e4de5fcefb33b82b0a7bea09fd9af310dc63ea4ac5cc5777d2564ba17be12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac9e4de5fcefb33b82b0a7bea09fd9af310dc63ea4ac5cc5777d2564ba17be12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac9e4de5fcefb33b82b0a7bea09fd9af310dc63ea4ac5cc5777d2564ba17be12", kill_on_drop: false }`
[INFO] [stdout] ac9e4de5fcefb33b82b0a7bea09fd9af310dc63ea4ac5cc5777d2564ba17be12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ec46cc58fcd18c91aff7b5cbebec928dd3b1d81c853a7a3b82dc7de326e9e59d
[INFO] running `Command { std: "docker" "start" "-a" "ec46cc58fcd18c91aff7b5cbebec928dd3b1d81c853a7a3b82dc7de326e9e59d", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling crc16 v0.4.0
[INFO] [stderr]    Compiling rustls-pki-types v1.13.0
[INFO] [stderr]    Compiling rustls v0.23.35
[INFO] [stderr]    Compiling linkme-impl v0.3.35
[INFO] [stderr]    Compiling tokio v1.48.0
[INFO] [stderr]    Compiling bytes-utils v0.1.4
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling cookie-factory v0.3.2
[INFO] [stderr]    Compiling linkme v0.3.35
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling sha-1 v0.10.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling fred-macros v0.1.0
[INFO] [stderr]    Compiling socket2 v0.5.10
[INFO] [stderr]    Compiling aok v0.1.18
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling err_exit v0.1.6
[INFO] [stderr]    Compiling rustls-webpki v0.103.8
[INFO] [stderr]    Compiling url v2.5.7
[INFO] [stderr]    Compiling redis-protocol v6.0.0
[INFO] [stderr]    Compiling float-cmp v0.10.0
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling futures v0.3.31
[INFO] [stderr]    Compiling tokio-stream v0.1.17
[INFO] [stderr]    Compiling tokio-util v0.7.17
[INFO] [stderr]    Compiling fred v10.1.0
[INFO] [stderr]    Compiling xkv v0.1.50
[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-0.1.50/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![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 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ec46cc58fcd18c91aff7b5cbebec928dd3b1d81c853a7a3b82dc7de326e9e59d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec46cc58fcd18c91aff7b5cbebec928dd3b1d81c853a7a3b82dc7de326e9e59d", kill_on_drop: false }`
[INFO] [stdout] ec46cc58fcd18c91aff7b5cbebec928dd3b1d81c853a7a3b82dc7de326e9e59d