Dec 19 14:15:06.405 INFO checking kk1fff/backprop against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 14:15:06.405 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/kk1fff/backprop:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 14:15:06.597 INFO [stdout] 6d13a00723260f029748e58e8cac9989e983dbd6fa131aa344cb2fd239472a78
Dec 19 14:15:06.602 INFO running `"docker" "start" "-a" "6d13a00723260f029748e58e8cac9989e983dbd6fa131aa344cb2fd239472a78"`
Dec 19 14:15:07.267 INFO [stderr]     Checking backprop v0.1.0 (/opt/crater/workdir)
Dec 19 14:15:07.468 INFO [stderr] warning: field is never used: `name`
Dec 19 14:15:07.468 INFO [stderr]   --> src/main.rs:46:5
Dec 19 14:15:07.468 INFO [stderr]    |
Dec 19 14:15:07.468 INFO [stderr] 46 |     name: String,
Dec 19 14:15:07.468 INFO [stderr]    |     ^^^^^^^^^^^^
Dec 19 14:15:07.468 INFO [stderr]    |
Dec 19 14:15:07.468 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 14:15:07.468 INFO [stderr] 
Dec 19 14:15:07.468 INFO [stderr] warning: field is never used: `name`
Dec 19 14:15:07.468 INFO [stderr]   --> src/main.rs:93:5
Dec 19 14:15:07.468 INFO [stderr]    |
Dec 19 14:15:07.468 INFO [stderr] 93 |     name: String,
Dec 19 14:15:07.468 INFO [stderr]    |     ^^^^^^^^^^^^
Dec 19 14:15:07.468 INFO [stderr] 
Dec 19 14:15:07.468 INFO [stderr] warning: field is never used: `op_set`
Dec 19 14:15:07.468 INFO [stderr]   --> src/main.rs:94:5
Dec 19 14:15:07.468 INFO [stderr]    |
Dec 19 14:15:07.468 INFO [stderr] 94 |     op_set: HashSet<String>,
Dec 19 14:15:07.468 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:15:07.468 INFO [stderr] 
Dec 19 14:15:07.472 INFO [stderr] warning: field is never used: `name`
Dec 19 14:15:07.472 INFO [stderr]   --> src/main.rs:46:5
Dec 19 14:15:07.472 INFO [stderr]    |
Dec 19 14:15:07.472 INFO [stderr] 46 |     name: String,
Dec 19 14:15:07.473 INFO [stderr]    |     ^^^^^^^^^^^^
Dec 19 14:15:07.473 INFO [stderr]    |
Dec 19 14:15:07.473 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 14:15:07.474 INFO [stderr] 
Dec 19 14:15:07.474 INFO [stderr] warning: field is never used: `name`
Dec 19 14:15:07.474 INFO [stderr]   --> src/main.rs:93:5
Dec 19 14:15:07.475 INFO [stderr]    |
Dec 19 14:15:07.475 INFO [stderr] 93 |     name: String,
Dec 19 14:15:07.475 INFO [stderr]    |     ^^^^^^^^^^^^
Dec 19 14:15:07.475 INFO [stderr] 
Dec 19 14:15:07.476 INFO [stderr] warning: field is never used: `op_set`
Dec 19 14:15:07.476 INFO [stderr]   --> src/main.rs:94:5
Dec 19 14:15:07.476 INFO [stderr]    |
Dec 19 14:15:07.476 INFO [stderr] 94 |     op_set: HashSet<String>,
Dec 19 14:15:07.476 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 14:15:07.476 INFO [stderr] 
Dec 19 14:15:07.504 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.25s
Dec 19 14:15:07.904 INFO running `"docker" "inspect" "6d13a00723260f029748e58e8cac9989e983dbd6fa131aa344cb2fd239472a78"`
Dec 19 14:15:07.982 INFO running `"docker" "rm" "-f" "6d13a00723260f029748e58e8cac9989e983dbd6fa131aa344cb2fd239472a78"`
Dec 19 14:15:08.074 INFO [stdout] 6d13a00723260f029748e58e8cac9989e983dbd6fa131aa344cb2fd239472a78