[INFO] fetching crate polished-css 0.1.0...
[INFO] testing polished-css-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate polished-css 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate polished-css 0.1.0
[INFO] finished tweaking crates.io crate polished-css 0.1.0
[INFO] tweaked toml for crates.io crate polished-css 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate polished-css 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 143 packages to latest compatible versions
[INFO] [stderr]       Adding strum v0.25.0 (available: v0.27.2)
[INFO] [stderr]       Adding strum_macros v0.25.3 (available: v0.27.2)
[INFO] [stderr]       Adding typed-builder v0.16.2 (available: v0.22.0)
[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 boolinator v2.4.0
[INFO] [stderr]   Downloaded pinned v0.1.0
[INFO] [stderr]   Downloaded gloo-utils v0.1.7
[INFO] [stderr]   Downloaded implicit-clone-derive v0.1.2
[INFO] [stderr]   Downloaded gloo-console v0.2.3
[INFO] [stderr]   Downloaded gloo-worker v0.2.1
[INFO] [stderr]   Downloaded gloo-console v0.3.0
[INFO] [stderr]   Downloaded typed-builder v0.16.2
[INFO] [stderr]   Downloaded gloo-net v0.4.0
[INFO] [stderr]   Downloaded polished-css-macros v0.1.0
[INFO] [stderr]   Downloaded typed-builder-macro v0.16.2
[INFO] [stderr]   Downloaded gloo-net v0.3.1
[INFO] [stderr]   Downloaded yew v0.21.0
[INFO] [stderr]   Downloaded gloo-history v0.2.2
[INFO] [stderr]   Downloaded serde-wasm-bindgen v0.6.5
[INFO] [stderr]   Downloaded implicit-clone v0.4.9
[INFO] [stderr]   Downloaded gloo-render v0.1.1
[INFO] [stderr]   Downloaded gloo v0.8.1
[INFO] [stderr]   Downloaded gloo-file v0.2.3
[INFO] [stderr]   Downloaded anymap2 v0.13.0
[INFO] [stderr]   Downloaded gloo-dialogs v0.2.0
[INFO] [stderr]   Downloaded gloo-file v0.3.0
[INFO] [stderr]   Downloaded gloo-render v0.2.0
[INFO] [stderr]   Downloaded gloo-storage v0.3.0
[INFO] [stderr]   Downloaded gloo-worker v0.4.0
[INFO] [stderr]   Downloaded gloo-dialogs v0.1.1
[INFO] [stderr]   Downloaded gloo-events v0.1.2
[INFO] [stderr]   Downloaded gloo-storage v0.2.2
[INFO] [stderr]   Downloaded gloo-events v0.2.0
[INFO] [stderr]   Downloaded gloo-utils v0.2.0
[INFO] [stderr]   Downloaded gloo-worker-macros v0.1.0
[INFO] [stderr]   Downloaded gloo-history v0.1.5
[INFO] [stderr]   Downloaded prokio v0.1.0
[INFO] [stderr]   Downloaded gloo v0.10.0
[INFO] [stderr]   Downloaded yew-macro v0.21.0
[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] 89073bc36c822bb1618ed0eebb476d10a8474088b83576b8c3cee046f85e85af
[INFO] running `Command { std: "docker" "start" "-a" "89073bc36c822bb1618ed0eebb476d10a8474088b83576b8c3cee046f85e85af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "89073bc36c822bb1618ed0eebb476d10a8474088b83576b8c3cee046f85e85af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89073bc36c822bb1618ed0eebb476d10a8474088b83576b8c3cee046f85e85af", kill_on_drop: false }`
[INFO] [stdout] 89073bc36c822bb1618ed0eebb476d10a8474088b83576b8c3cee046f85e85af
[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] 3ceb56733b1bb124dc37178a56bb79bb4bfa51cbe28d894d03d4be9d6bb48896
[INFO] running `Command { std: "docker" "start" "-a" "3ceb56733b1bb124dc37178a56bb79bb4bfa51cbe28d894d03d4be9d6bb48896", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustversion v1.0.22
[INFO] [stderr]    Compiling unicode-segmentation v1.12.0
[INFO] [stderr]    Compiling strum v0.25.0
[INFO] [stderr]    Compiling typed-builder-macro v0.16.2
[INFO] [stderr]    Compiling convert_case v0.6.0
[INFO] [stderr]    Compiling strum_macros v0.25.3
[INFO] [stderr]    Compiling typed-builder v0.16.2
[INFO] [stderr]    Compiling polished-css-macros v0.1.0
[INFO] [stderr]    Compiling polished-css v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_trait_impl)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/selector/class.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     #[must_use]
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/selector/class.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     #[must_use]
[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 `polished-css` (lib) due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "3ceb56733b1bb124dc37178a56bb79bb4bfa51cbe28d894d03d4be9d6bb48896", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ceb56733b1bb124dc37178a56bb79bb4bfa51cbe28d894d03d4be9d6bb48896", kill_on_drop: false }`
[INFO] [stdout] 3ceb56733b1bb124dc37178a56bb79bb4bfa51cbe28d894d03d4be9d6bb48896