[INFO] fetching crate serde-device-tree 0.0.1...
[INFO] testing serde-device-tree-0.0.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate serde-device-tree 0.0.1 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate serde-device-tree 0.0.1
[INFO] finished tweaking crates.io crate serde-device-tree 0.0.1
[INFO] tweaked toml for crates.io crate serde-device-tree 0.0.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate serde-device-tree 0.0.1 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] crate crates.io crate serde-device-tree 0.0.1 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unicode-xid v0.2.2
[INFO] [stderr]   Downloaded proc-macro2 v1.0.33
[INFO] [stderr]   Downloaded serde_derive v1.0.131
[INFO] [stderr]   Downloaded quote v1.0.10
[INFO] [stderr]   Downloaded serde v1.0.131
[INFO] [stderr]   Downloaded syn v1.0.82
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 46e58a154d5093d50809a624987136d0e6b9bbc09e25e5c8538704f2cf237f34
[INFO] running `Command { std: "docker" "start" "-a" "46e58a154d5093d50809a624987136d0e6b9bbc09e25e5c8538704f2cf237f34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46e58a154d5093d50809a624987136d0e6b9bbc09e25e5c8538704f2cf237f34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46e58a154d5093d50809a624987136d0e6b9bbc09e25e5c8538704f2cf237f34", kill_on_drop: false }`
[INFO] [stdout] 46e58a154d5093d50809a624987136d0e6b9bbc09e25e5c8538704f2cf237f34
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] ccfe0eb07a0f87a9fa53175cf1dac9464fcb9f77f1b8562a4d568673fd9bb3c7
[INFO] running `Command { std: "docker" "start" "-a" "ccfe0eb07a0f87a9fa53175cf1dac9464fcb9f77f1b8562a4d568673fd9bb3c7", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.131
[INFO] [stderr]    Compiling serde-device-tree v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(ptr_metadata)]
[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 `serde-device-tree` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "ccfe0eb07a0f87a9fa53175cf1dac9464fcb9f77f1b8562a4d568673fd9bb3c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccfe0eb07a0f87a9fa53175cf1dac9464fcb9f77f1b8562a4d568673fd9bb3c7", kill_on_drop: false }`
[INFO] [stdout] ccfe0eb07a0f87a9fa53175cf1dac9464fcb9f77f1b8562a4d568673fd9bb3c7