[INFO] fetching crate freezable 0.1.8...
[INFO] testing freezable-0.1.8 against 1.90.0 for beta-1.91-3
[INFO] extracting crate freezable 0.1.8 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate freezable 0.1.8
[INFO] finished tweaking crates.io crate freezable 0.1.8
[INFO] tweaked toml for crates.io crate freezable 0.1.8 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate freezable 0.1.8 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] 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] d90468f7defacb4ff2e5b8cdbc7e620ecdb3afb0a76e95e2f03eae9934bd1dc4
[INFO] running `Command { std: "docker" "start" "-a" "d90468f7defacb4ff2e5b8cdbc7e620ecdb3afb0a76e95e2f03eae9934bd1dc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d90468f7defacb4ff2e5b8cdbc7e620ecdb3afb0a76e95e2f03eae9934bd1dc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d90468f7defacb4ff2e5b8cdbc7e620ecdb3afb0a76e95e2f03eae9934bd1dc4", kill_on_drop: false }`
[INFO] [stdout] d90468f7defacb4ff2e5b8cdbc7e620ecdb3afb0a76e95e2f03eae9934bd1dc4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 4202a2880978a2d6d0c9d14247aa530f4eff1095cc3b7d260c6c311fa8787d8a
[INFO] running `Command { std: "docker" "start" "-a" "4202a2880978a2d6d0c9d14247aa530f4eff1095cc3b7d260c6c311fa8787d8a", kill_on_drop: false }`
[INFO] [stderr]    Compiling freezable v0.1.8 (/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(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hash_map::FrozenMap`
[INFO] [stdout]  --> src/frozen_std/collections/mod.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub use hash_map::FrozenMap;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hash_set::FrozenSet`
[INFO] [stdout]  --> src/frozen_std/collections/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use hash_set::FrozenSet;
[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 `freezable` (lib) due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "4202a2880978a2d6d0c9d14247aa530f4eff1095cc3b7d260c6c311fa8787d8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4202a2880978a2d6d0c9d14247aa530f4eff1095cc3b7d260c6c311fa8787d8a", kill_on_drop: false }`
[INFO] [stdout] 4202a2880978a2d6d0c9d14247aa530f4eff1095cc3b7d260c6c311fa8787d8a
