[INFO] cloning repository https://github.com/snctfd/gausselim-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/snctfd/gausselim-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsnctfd%2Fgausselim-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsnctfd%2Fgausselim-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a6310d4df3cb1c73f5d422e51c052d54a5a11ef6
[INFO] testing snctfd/gausselim-rs against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsnctfd%2Fgausselim-rs" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/snctfd/gausselim-rs on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/snctfd/gausselim-rs
[INFO] finished tweaking git repo https://github.com/snctfd/gausselim-rs
[INFO] tweaked toml for git repo https://github.com/snctfd/gausselim-rs written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/snctfd/gausselim-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9181f8443a9426a0f8c4e504a65f6efe1c3a7c743a9e4c350926f5bd76ca138d
[INFO] running `Command { std: "docker" "start" "-a" "9181f8443a9426a0f8c4e504a65f6efe1c3a7c743a9e4c350926f5bd76ca138d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9181f8443a9426a0f8c4e504a65f6efe1c3a7c743a9e4c350926f5bd76ca138d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9181f8443a9426a0f8c4e504a65f6efe1c3a7c743a9e4c350926f5bd76ca138d", kill_on_drop: false }`
[INFO] [stdout] 9181f8443a9426a0f8c4e504a65f6efe1c3a7c743a9e4c350926f5bd76ca138d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] df7258316db23f0023eb91c76934f87e84e52f4a9b51781d6728c66ca68a9354
[INFO] running `Command { std: "docker" "start" "-a" "df7258316db23f0023eb91c76934f87e84e52f4a9b51781d6728c66ca68a9354", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling gausselim v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/matrix.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let c = self.cols;
[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] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/matrix.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn new(contents: Vec<f32>, rows: usize, cols: usize) -> Matrix {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `swap_rows`
[INFO] [stdout]   --> src/matrix.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn swap_rows(&mut self, i: usize, j: usize) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mult_row`
[INFO] [stdout]   --> src/matrix.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn mult_row(&mut self, row: usize, val: f32) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_row`
[INFO] [stdout]   --> src/matrix.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn add_row(&mut self, to: usize, from: usize) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_matrix`
[INFO] [stdout]  --> src/main.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn read_matrix(reader: &mut dyn Read) -> Result<Matrix, Box<dyn Error>> {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `Command { std: "docker" "inspect" "df7258316db23f0023eb91c76934f87e84e52f4a9b51781d6728c66ca68a9354", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df7258316db23f0023eb91c76934f87e84e52f4a9b51781d6728c66ca68a9354", kill_on_drop: false }`
[INFO] [stdout] df7258316db23f0023eb91c76934f87e84e52f4a9b51781d6728c66ca68a9354
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff3f7976e9422bff028de1ef878b47393820ad367e386e2ea035dd787018ee50
[INFO] running `Command { std: "docker" "start" "-a" "ff3f7976e9422bff028de1ef878b47393820ad367e386e2ea035dd787018ee50", kill_on_drop: false }`
[INFO] [stderr]    Compiling gausselim v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/matrix.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let c = self.cols;
[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] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 31 |         let mut text = String::from("4 2\n1 2.0 3 4\n5 6\n7 8");
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `Command { std: "docker" "inspect" "ff3f7976e9422bff028de1ef878b47393820ad367e386e2ea035dd787018ee50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff3f7976e9422bff028de1ef878b47393820ad367e386e2ea035dd787018ee50", kill_on_drop: false }`
[INFO] [stdout] ff3f7976e9422bff028de1ef878b47393820ad367e386e2ea035dd787018ee50
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] bde1fd756622474f39cc006b5c4090628f766c0dd5d8e1982ce696ad3623076b
[INFO] running `Command { std: "docker" "start" "-a" "bde1fd756622474f39cc006b5c4090628f766c0dd5d8e1982ce696ad3623076b", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/matrix.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |         let c = self.cols;
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:31:13
[INFO] [stderr]    |
[INFO] [stderr] 31 |         let mut text = String::from("4 2\n1 2.0 3 4\n5 6\n7 8");
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `gausselim` (bin "gausselim" test) generated 3 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/gausselim-985586a3318c6a9e)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test matrix::tests::add_row ... ok
[INFO] [stdout] test matrix::tests::indexing ... ok
[INFO] [stdout] test tests::test_read_matrix ... ok
[INFO] [stdout] test matrix::tests::mult_row ... ok
[INFO] [stdout] test matrix::tests::new ... ok
[INFO] [stdout] test matrix::tests::swap_rows ... ok
[INFO] [stdout] test matrix::tests::string ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "bde1fd756622474f39cc006b5c4090628f766c0dd5d8e1982ce696ad3623076b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bde1fd756622474f39cc006b5c4090628f766c0dd5d8e1982ce696ad3623076b", kill_on_drop: false }`
[INFO] [stdout] bde1fd756622474f39cc006b5c4090628f766c0dd5d8e1982ce696ad3623076b