[INFO] fetching crate piecrust-macros 0.1.0...
[INFO] testing piecrust-macros-0.1.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate piecrust-macros 0.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate piecrust-macros 0.1.0
[INFO] finished tweaking crates.io crate piecrust-macros 0.1.0
[INFO] tweaked toml for crates.io crate piecrust-macros 0.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate piecrust-macros 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]      Locking 28 packages to latest compatible versions
[INFO] [stderr]       Adding piecrust-uplink v0.9.0 (available: v0.18.0)
[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 piecrust-uplink v0.9.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] d110af5cf5af5a0f64a92b513ccda33f26544666c686d43bcd59ac8cb31610e1
[INFO] running `Command { std: "docker" "start" "-a" "d110af5cf5af5a0f64a92b513ccda33f26544666c686d43bcd59ac8cb31610e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d110af5cf5af5a0f64a92b513ccda33f26544666c686d43bcd59ac8cb31610e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d110af5cf5af5a0f64a92b513ccda33f26544666c686d43bcd59ac8cb31610e1", kill_on_drop: false }`
[INFO] [stdout] d110af5cf5af5a0f64a92b513ccda33f26544666c686d43bcd59ac8cb31610e1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 2d1efb540b0b70a36d1be616185d405d2c3b11b22ca1bb0e9572510c4e30d9f1
[INFO] running `Command { std: "docker" "start" "-a" "2d1efb540b0b70a36d1be616185d405d2c3b11b22ca1bb0e9572510c4e30d9f1", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling cfg-if v1.0.4
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling libc v0.2.177
[INFO] [stderr]    Compiling bytecheck v0.6.12
[INFO] [stderr]    Compiling ahash v0.7.8
[INFO] [stderr]    Compiling rkyv v0.7.45
[INFO] [stderr]    Compiling seahash v4.1.0
[INFO] [stderr]    Compiling syn v2.0.108
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling hashbrown v0.12.3
[INFO] [stderr]    Compiling ptr_meta_derive v0.1.4
[INFO] [stderr]    Compiling rkyv_derive v0.7.45
[INFO] [stderr]    Compiling bytecheck_derive v0.6.12
[INFO] [stderr]    Compiling ptr_meta v0.1.4
[INFO] [stderr]    Compiling piecrust-uplink v0.9.0
[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/piecrust-uplink-0.9.0/src/lib.rs:63:1
[INFO] [stdout]    |
[INFO] [stdout] 63 | #![feature(lang_items, panic_info_message)]
[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 `piecrust-uplink` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "2d1efb540b0b70a36d1be616185d405d2c3b11b22ca1bb0e9572510c4e30d9f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d1efb540b0b70a36d1be616185d405d2c3b11b22ca1bb0e9572510c4e30d9f1", kill_on_drop: false }`
[INFO] [stdout] 2d1efb540b0b70a36d1be616185d405d2c3b11b22ca1bb0e9572510c4e30d9f1