[INFO] fetching crate arthroprod 0.2.1...
[INFO] checking arthroprod-0.2.1 against master#bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc for pr-70917
[INFO] extracting crate arthroprod 0.2.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate arthroprod 0.2.1 on toolchain bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate arthroprod 0.2.1
[INFO] finished tweaking crates.io crate arthroprod 0.2.1
[INFO] tweaked toml for crates.io crate arthroprod 0.2.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate arthroprod 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 50dfc03265813c75eb62c698da9bd4294da1aa575addde6a051384a6c59176d7
[INFO] running `"docker" "start" "-a" "50dfc03265813c75eb62c698da9bd4294da1aa575addde6a051384a6c59176d7"`
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling test-case v1.0.0
[INFO] [stderr]     Checking serde_json v1.0.50
[INFO] [stderr]    Compiling serde_derive v1.0.106
[INFO] [stderr]     Checking arthroprod v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused return value of `std::string::String::split_off` that must be used
[INFO] [stderr]    --> src/algebra/types/multivector.rs:176:25
[INFO] [stderr]     |
[INFO] [stderr] 176 |                         vec_str.split_off(desired_len);
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: use `.truncate()` if you don't need the other half
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::string::String::split_off` that must be used
[INFO] [stderr]    --> src/algebra/types/multivector.rs:176:25
[INFO] [stderr]     |
[INFO] [stderr] 176 |                         vec_str.split_off(desired_len);
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: use `.truncate()` if you don't need the other half
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 39.85s
[INFO] running `"docker" "inspect" "50dfc03265813c75eb62c698da9bd4294da1aa575addde6a051384a6c59176d7"`
[INFO] running `"docker" "rm" "-f" "50dfc03265813c75eb62c698da9bd4294da1aa575addde6a051384a6c59176d7"`
[INFO] [stdout] 50dfc03265813c75eb62c698da9bd4294da1aa575addde6a051384a6c59176d7
