[INFO] fetching crate cralgebra 0.2.1...
[INFO] testing cralgebra-0.2.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate cralgebra 0.2.1 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate cralgebra 0.2.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate cralgebra 0.2.1
[INFO] tweaked toml for crates.io crate cralgebra 0.2.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate cralgebra 0.2.1 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 cralgebra 0.2.1 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_core v0.6.4
[INFO] [stderr]   Downloaded rand v0.8.5
[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] 1f2deea557a5fa6116c9deb4208c6b2e13f8be7821b2a6e8e78902952c7fa3e7
[INFO] running `Command { std: "docker" "start" "-a" "1f2deea557a5fa6116c9deb4208c6b2e13f8be7821b2a6e8e78902952c7fa3e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f2deea557a5fa6116c9deb4208c6b2e13f8be7821b2a6e8e78902952c7fa3e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f2deea557a5fa6116c9deb4208c6b2e13f8be7821b2a6e8e78902952c7fa3e7", kill_on_drop: false }`
[INFO] [stdout] 1f2deea557a5fa6116c9deb4208c6b2e13f8be7821b2a6e8e78902952c7fa3e7
[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] 8ca457d836e187e096694bafb5631c4877e6058a857e49772bbe63e9c691aefb
[INFO] running `Command { std: "docker" "start" "-a" "8ca457d836e187e096694bafb5631c4877e6058a857e49772bbe63e9c691aefb", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling cralgebra v0.2.1 (/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(bigint_helper_methods)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/types/montgomery_dyn.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let c = ctx.1;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cralgebra` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "8ca457d836e187e096694bafb5631c4877e6058a857e49772bbe63e9c691aefb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ca457d836e187e096694bafb5631c4877e6058a857e49772bbe63e9c691aefb", kill_on_drop: false }`
[INFO] [stdout] 8ca457d836e187e096694bafb5631c4877e6058a857e49772bbe63e9c691aefb