[INFO] cloning repository https://github.com/p-flock/matmult-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/p-flock/matmult-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fp-flock%2Fmatmult-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fp-flock%2Fmatmult-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 868f3c9e49d4c7572f9160733a9f6e51095590e0
[INFO] testing p-flock/matmult-rust against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fp-flock%2Fmatmult-rust" "/workspace/builds/worker-16/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-16/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/p-flock/matmult-rust on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/p-flock/matmult-rust
[INFO] finished tweaking git repo https://github.com/p-flock/matmult-rust
[INFO] tweaked toml for git repo https://github.com/p-flock/matmult-rust written to /workspace/builds/worker-16/source/Cargo.toml
[INFO] crate git repo https://github.com/p-flock/matmult-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d8a2211fee0c034f851a4d8b6d34ff582e8b3e595cd463889be74d39cdc2510
[INFO] running `Command { std: "docker" "start" "-a" "0d8a2211fee0c034f851a4d8b6d34ff582e8b3e595cd463889be74d39cdc2510", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d8a2211fee0c034f851a4d8b6d34ff582e8b3e595cd463889be74d39cdc2510", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d8a2211fee0c034f851a4d8b6d34ff582e8b3e595cd463889be74d39cdc2510", kill_on_drop: false }`
[INFO] [stdout] 0d8a2211fee0c034f851a4d8b6d34ff582e8b3e595cd463889be74d39cdc2510
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4a296e77e13593ed5d6bbbdb1c68a73b4c5213c699114319325bc786794f059
[INFO] running `Command { std: "docker" "start" "-a" "e4a296e77e13593ed5d6bbbdb1c68a73b4c5213c699114319325bc786794f059", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling multi_matmult v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:31:34
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn parse_matrix(file_1: &str) -> (Vec<Vec<f64>>) {
[INFO] [stdout]    |                                  ^             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 31 - fn parse_matrix(file_1: &str) -> (Vec<Vec<f64>>) {
[INFO] [stdout] 31 + fn parse_matrix(file_1: &str) -> Vec<Vec<f64>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `output_matrix`
[INFO] [stdout]   --> src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let output_matrix = multiply_matrices(&a, &b);
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_output_matrix`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.10s
[INFO] running `Command { std: "docker" "inspect" "e4a296e77e13593ed5d6bbbdb1c68a73b4c5213c699114319325bc786794f059", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4a296e77e13593ed5d6bbbdb1c68a73b4c5213c699114319325bc786794f059", kill_on_drop: false }`
[INFO] [stdout] e4a296e77e13593ed5d6bbbdb1c68a73b4c5213c699114319325bc786794f059
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 82a88865f3b1720334d5e9b552c2eeb960ce43e54e6623aa67ca352ce35b82ab
[INFO] running `Command { std: "docker" "start" "-a" "82a88865f3b1720334d5e9b552c2eeb960ce43e54e6623aa67ca352ce35b82ab", kill_on_drop: false }`
[INFO] [stderr]    Compiling multi_matmult v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/main.rs:31:34
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn parse_matrix(file_1: &str) -> (Vec<Vec<f64>>) {
[INFO] [stdout]    |                                  ^             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 31 - fn parse_matrix(file_1: &str) -> (Vec<Vec<f64>>) {
[INFO] [stdout] 31 + fn parse_matrix(file_1: &str) -> Vec<Vec<f64>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `output_matrix`
[INFO] [stdout]   --> src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let output_matrix = multiply_matrices(&a, &b);
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_output_matrix`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.41s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/multi_matmult-f8c0b5beffc76031)
[INFO] running `Command { std: "docker" "inspect" "82a88865f3b1720334d5e9b552c2eeb960ce43e54e6623aa67ca352ce35b82ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82a88865f3b1720334d5e9b552c2eeb960ce43e54e6623aa67ca352ce35b82ab", kill_on_drop: false }`
[INFO] [stdout] 82a88865f3b1720334d5e9b552c2eeb960ce43e54e6623aa67ca352ce35b82ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8b7ba9ee5ce5990454e2793dcbba79ba1e8fb6ece7adba63b5f15add0cf00ed3
[INFO] running `Command { std: "docker" "start" "-a" "8b7ba9ee5ce5990454e2793dcbba79ba1e8fb6ece7adba63b5f15add0cf00ed3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/main.rs:31:34
[INFO] [stderr]    |
[INFO] [stderr] 31 | fn parse_matrix(file_1: &str) -> (Vec<Vec<f64>>) {
[INFO] [stderr]    |                                  ^             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 31 - fn parse_matrix(file_1: &str) -> (Vec<Vec<f64>>) {
[INFO] [stderr] 31 + fn parse_matrix(file_1: &str) -> Vec<Vec<f64>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `output_matrix`
[INFO] [stderr]   --> src/main.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let output_matrix = multiply_matrices(&a, &b);
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_output_matrix`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `multi_matmult` (bin "multi_matmult" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.37s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/multi_matmult-f8c0b5beffc76031)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8b7ba9ee5ce5990454e2793dcbba79ba1e8fb6ece7adba63b5f15add0cf00ed3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b7ba9ee5ce5990454e2793dcbba79ba1e8fb6ece7adba63b5f15add0cf00ed3", kill_on_drop: false }`
[INFO] [stdout] 8b7ba9ee5ce5990454e2793dcbba79ba1e8fb6ece7adba63b5f15add0cf00ed3