[INFO] cloning repository ahouts/math166-assignment2
[INFO] running `"git" "clone" "--bare" "git://github.com/ahouts/math166-assignment2.git" "work/cache/sources/gh/ahouts/math166-assignment2"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/ahouts/math166-assignment2'...
[INFO] running `"git" "clone" "work/cache/sources/gh/ahouts/math166-assignment2" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/ahouts/math166-assignment2"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/ahouts/math166-assignment2'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ahouts/math166-assignment2" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/ahouts/math166-assignment2"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/ahouts/math166-assignment2'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4a89187ef91f6b75d3c9e649207e8b1b98a8efbc
[INFO] sha for GitHub repo ahouts/math166-assignment2: 4a89187ef91f6b75d3c9e649207e8b1b98a8efbc
[INFO] validating manifest of ahouts/math166-assignment2 on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ahouts/math166-assignment2 on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ahouts/math166-assignment2
[INFO] finished frobbing ahouts/math166-assignment2
[INFO] frobbed toml for ahouts/math166-assignment2 written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/ahouts/math166-assignment2/Cargo.toml
[INFO] started frobbing ahouts/math166-assignment2
[INFO] finished frobbing ahouts/math166-assignment2
[INFO] frobbed toml for ahouts/math166-assignment2 written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/ahouts/math166-assignment2/Cargo.toml
[INFO] crate ahouts/math166-assignment2 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking ahouts/math166-assignment2 against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-2/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/ahouts/math166-assignment2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d99b5cf725a81aea6493267518dadc477ea09e20527d6858242c34d2607f4ed3
[INFO] running `"docker" "start" "-a" "d99b5cf725a81aea6493267518dadc477ea09e20527d6858242c34d2607f4ed3"`
[INFO] [stderr]     Checking math166-assignment2 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `ReverseSub`
[INFO] [stderr]   --> src/mat_eqn_solver.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub struct ReverseSub<T: UpperTriangle> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ReverseSub`
[INFO] [stderr]   --> src/mat_eqn_solver.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub struct ReverseSub<T: UpperTriangle> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `"docker" "inspect" "d99b5cf725a81aea6493267518dadc477ea09e20527d6858242c34d2607f4ed3"`
[INFO] running `"docker" "rm" "-f" "d99b5cf725a81aea6493267518dadc477ea09e20527d6858242c34d2607f4ed3"`
[INFO] [stdout] d99b5cf725a81aea6493267518dadc477ea09e20527d6858242c34d2607f4ed3