[INFO] fetching crate sparse-bin-mat 0.7.0...
[INFO] testing sparse-bin-mat-0.7.0 against 1.95.0 for beta-1.96-2
[INFO] extracting crate sparse-bin-mat 0.7.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate sparse-bin-mat 0.7.0
[INFO] finished tweaking crates.io crate sparse-bin-mat 0.7.0
[INFO] tweaked toml for crates.io crate sparse-bin-mat 0.7.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate sparse-bin-mat 0.7.0 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate sparse-bin-mat 0.7.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded quote v1.0.17
[INFO] [stderr]   Downloaded is_sorted v0.1.1
[INFO] [stderr]   Downloaded syn v1.0.89
[INFO] [stderr]   Downloaded serde_json v1.0.79
[INFO] [stderr]   Downloaded serde_test v1.0.136
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd57c42116434190dfaf61d50c693c94599c591bd3270869807a01ba3a7d5754
[INFO] running `Command { std: "docker" "start" "-a" "bd57c42116434190dfaf61d50c693c94599c591bd3270869807a01ba3a7d5754", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd57c42116434190dfaf61d50c693c94599c591bd3270869807a01ba3a7d5754", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd57c42116434190dfaf61d50c693c94599c591bd3270869807a01ba3a7d5754", kill_on_drop: false }`
[INFO] [stdout] bd57c42116434190dfaf61d50c693c94599c591bd3270869807a01ba3a7d5754
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 50c18ea0c8a2404a4a7be3e218b67620f081f04fe903ea2a3aa2e1bc551f2e8b
[INFO] running `Command { std: "docker" "start" "-a" "50c18ea0c8a2404a4a7be3e218b67620f081f04fe903ea2a3aa2e1bc551f2e8b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.89
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling itoa v1.0.1
[INFO] [stderr]    Compiling ryu v1.0.9
[INFO] [stderr]    Compiling is_sorted v0.1.1
[INFO] [stderr]    Compiling itertools v0.10.3
[INFO] [stderr]    Compiling quote v1.0.17
[INFO] [stderr]    Compiling sparse-bin-mat v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:437:16
[INFO] [stdout]     |
[INFO] [stdout] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice> {
[INFO] [stdout]     |                ^^^^^                        ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                |
[INFO] [stdout]     |                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice<'_>> {
[INFO] [stdout]     |                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:467:17
[INFO] [stdout]     |
[INFO] [stdout] 467 |     pub fn rows(&self) -> Rows {
[INFO] [stdout]     |                 ^^^^^     ^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 467 |     pub fn rows(&self) -> Rows<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:491:33
[INFO] [stdout]     |
[INFO] [stdout] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements {
[INFO] [stdout]     |                                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements<'_> {
[INFO] [stdout]     |                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vector/mod.rs:335:20
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn as_view(&self) -> SparseBinSlice {
[INFO] [stdout]     |                    ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn as_view(&self) -> SparseBinSlice<'_> {
[INFO] [stdout]     |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.10s
[INFO] running `Command { std: "docker" "inspect" "50c18ea0c8a2404a4a7be3e218b67620f081f04fe903ea2a3aa2e1bc551f2e8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50c18ea0c8a2404a4a7be3e218b67620f081f04fe903ea2a3aa2e1bc551f2e8b", kill_on_drop: false }`
[INFO] [stdout] 50c18ea0c8a2404a4a7be3e218b67620f081f04fe903ea2a3aa2e1bc551f2e8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30cfc398fa4f595ca8b7188289c478696013d8217a226f3489c4604989fc943e
[INFO] running `Command { std: "docker" "start" "-a" "30cfc398fa4f595ca8b7188289c478696013d8217a226f3489c4604989fc943e", kill_on_drop: false }`
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:437:16
[INFO] [stdout]     |
[INFO] [stdout] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice> {
[INFO] [stdout]     |                ^^^^^                        ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                |
[INFO] [stdout]     |                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice<'_>> {
[INFO] [stdout]     |                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:467:17
[INFO] [stdout]     |
[INFO] [stdout] 467 |     pub fn rows(&self) -> Rows {
[INFO] [stdout]     |                 ^^^^^     ^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 467 |     pub fn rows(&self) -> Rows<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling serde_test v1.0.136
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:491:33
[INFO] [stdout]     |
[INFO] [stdout] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements {
[INFO] [stdout]     |                                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements<'_> {
[INFO] [stdout]     |                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vector/mod.rs:335:20
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn as_view(&self) -> SparseBinSlice {
[INFO] [stdout]     |                    ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn as_view(&self) -> SparseBinSlice<'_> {
[INFO] [stdout]     |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling sparse-bin-mat v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:437:16
[INFO] [stdout]     |
[INFO] [stdout] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice> {
[INFO] [stdout]     |                ^^^^^                        ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                |
[INFO] [stdout]     |                the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice<'_>> {
[INFO] [stdout]     |                                                           ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:467:17
[INFO] [stdout]     |
[INFO] [stdout] 467 |     pub fn rows(&self) -> Rows {
[INFO] [stdout]     |                 ^^^^^     ^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 467 |     pub fn rows(&self) -> Rows<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/matrix/mod.rs:491:33
[INFO] [stdout]     |
[INFO] [stdout] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements {
[INFO] [stdout]     |                                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements<'_> {
[INFO] [stdout]     |                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/vector/mod.rs:335:20
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn as_view(&self) -> SparseBinSlice {
[INFO] [stdout]     |                    ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub fn as_view(&self) -> SparseBinSlice<'_> {
[INFO] [stdout]     |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 2.19s
[INFO] running `Command { std: "docker" "inspect" "30cfc398fa4f595ca8b7188289c478696013d8217a226f3489c4604989fc943e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30cfc398fa4f595ca8b7188289c478696013d8217a226f3489c4604989fc943e", kill_on_drop: false }`
[INFO] [stdout] 30cfc398fa4f595ca8b7188289c478696013d8217a226f3489c4604989fc943e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 168223b8499caf3f05287bff46f32abd99f22c9fb310eb1ce39d6e890ff6ed2e
[INFO] running `Command { std: "docker" "start" "-a" "168223b8499caf3f05287bff46f32abd99f22c9fb310eb1ce39d6e890ff6ed2e", kill_on_drop: false }`
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout] 
[INFO] [stderr]    --> src/matrix/mod.rs:437:16
[INFO] [stdout] running 49 tests
[INFO] [stderr]     |
[INFO] [stdout] test matrix::concat::test::horizontal_concat_from_empty_matrix ... ok
[INFO] [stderr] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice> {
[INFO] [stdout] test matrix::concat::test::horizontal_concat_with_empty_matrix ... ok
[INFO] [stderr]     |                ^^^^^                        ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout] test matrix::concat::test::horizontal_concat_with_smaller_left_matrix ... ok
[INFO] [stderr]     |                |
[INFO] [stdout] test matrix::concat::test::horizontal_concat_with_equal_length_matrices ... ok
[INFO] [stderr]     |                the lifetime is elided here
[INFO] [stdout] test matrix::concat::test::vertical_concat_with_smaller_bottom_matrix ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::concat::test::horizontal_concat_with_smaller_right_matrix ... ok
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] test matrix::concat::test::vertical_concat_with_smaller_top_matrix ... ok
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] test matrix::concat::test::vertical_concatwith_equal_length_matrices ... ok
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stdout] test matrix::gauss_jordan::test::do_nothing_if_already_in_echelon_form ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::gauss_jordan::test::compute_the_good_echelon_form ... ok
[INFO] [stderr] 437 |     pub fn row(&self, row: usize) -> Option<SparseBinSlice<'_>> {
[INFO] [stdout] test matrix::gauss_jordan::test::ranks ... ok
[INFO] [stderr]     |                                                           ++++
[INFO] [stdout] test matrix::inplace_operations::test::insert_one_at_end_of_row ... ok
[INFO] [stderr] 
[INFO] [stdout] test matrix::inplace_operations::test::insert_one_at_start_of_row ... ok
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout] test matrix::inplace_operations::test::insert_two_ones_in_middle_or_row ... ok
[INFO] [stderr]    --> src/matrix/mod.rs:467:17
[INFO] [stdout] test matrix::inplace_operations::test::remove_one_at_end_of_row ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::inplace_operations::test::remove_two_ones_in_middle_or_row ... ok
[INFO] [stderr] 467 |     pub fn rows(&self) -> Rows {
[INFO] [stdout] test matrix::kronecker::test::left_kron_with_identity ... ok
[INFO] [stderr]     |                 ^^^^^     ^^^^ the same lifetime is hidden here
[INFO] [stdout] test matrix::kronecker::test::right_kron_with_identity ... ok
[INFO] [stderr]     |                 |
[INFO] [stdout] test matrix::non_trivial_elements::test::non_trivial_elements_of_small_matrix ... ok
[INFO] [stderr]     |                 the lifetime is elided here
[INFO] [stdout] test matrix::nullspace::test::normal_form ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::nullspace::test::nullspace_of_rank_1_matrix ... ok
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] test matrix::ser_de::test::de_unsorted_rows ... ok
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stdout] test matrix::nullspace::test::matrix_with_zero_rows ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::ser_de::test::ser_de_2_by_5_matrix ... ok
[INFO] [stderr] 467 |     pub fn rows(&self) -> Rows<'_> {
[INFO] [stdout] test matrix::test::column_permutation ... ok
[INFO] [stderr]     |                               ++++
[INFO] [stdout] test matrix::ser_de::test::ser_de_empty_matrix ... ok
[INFO] [stderr] 
[INFO] [stdout] test matrix::test::multiplication_with_other_matrix ... ok
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout] test matrix::test::permutation ... ok
[INFO] [stderr]    --> src/matrix/mod.rs:491:33
[INFO] [stdout] test matrix::test::addition ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::inplace_operations::test::remove_one_at_start_of_row ... ok
[INFO] [stderr] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements {
[INFO] [stdout] test matrix::test::solve_surface_code_no_solution ... ok
[INFO] [stderr]     |                                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout] test matrix::rows::test::checks_iterator ... ok
[INFO] [stderr]     |                                 |
[INFO] [stdout] test matrix::rows::test::checks_iterator_for_empty_matrix ... ok
[INFO] [stderr]     |                                 the lifetime is elided here
[INFO] [stdout] test matrix::transpose::test::tranposition_with_some_empty_transposed_rows ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::test::solve_surface_code ... ok
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] test matrix::test::solve_surface_code_horizontal_only ... ok
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stdout] test matrix::transpose::test::transpose_matrix_without_rows ... ok
[INFO] [stderr]     |
[INFO] [stdout] test vector::test::addition ... ok
[INFO] [stderr] 491 |     pub fn non_trivial_elements(&self) -> NonTrivialElements<'_> {
[INFO] [stdout] test vector::test::ser_de ... ok
[INFO] [stderr]     |                                                             ++++
[INFO] [stdout] test matrix::transpose::test::transposition_of_empty_matrix ... ok
[INFO] [stderr] 
[INFO] [stdout] test matrix::transpose::test::transposition_of_general_matrix ... ok
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout] test matrix::test::solve_simple_matrix ... ok
[INFO] [stderr]    --> src/vector/mod.rs:335:20
[INFO] [stdout] test matrix::rows::test::reverse_checks_iterator ... ok
[INFO] [stderr]     |
[INFO] [stdout] test matrix::kronecker::test::kron_with_itself ... ok
[INFO] [stderr] 335 |     pub fn as_view(&self) -> SparseBinSlice {
[INFO] [stdout] test matrix::rows::test::bothway_checks_iterator ... ok
[INFO] [stderr]     |                    ^^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                    |
[INFO] [stderr]     |                    the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 335 |     pub fn as_view(&self) -> SparseBinSlice<'_> {
[INFO] [stderr]     |                                            ++++
[INFO] [stderr] 
[INFO] [stderr] warning: `sparse-bin-mat` (lib) generated 4 warnings (run `cargo fix --lib -p sparse-bin-mat` to apply 4 suggestions)
[INFO] [stderr] warning: `sparse-bin-mat` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/sparse_bin_mat-1af50e4e2acca5a8)
[INFO] [stdout] test matrix::test::panics_on_construction_if_rows_are_out_of_bound - should panic ... ok
[INFO] [stderr]    Doc-tests sparse_bin_mat
[INFO] [stdout] test matrix::test::panics_on_matrix_multiplication_if_wrong_dimension ... ok
[INFO] [stdout] test matrix::test::panics_on_addition_if_different_dimensions ... ok
[INFO] [stdout] test vector::test::panics_on_addition_if_different_length ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 49 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.09s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 52 tests
[INFO] [stdout] test src/lib.rs - (line 12) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::bitwise_xor_with (line 832) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::get (line 320) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::keep_only_columns (line 1022) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::emplace_at (line 350) ... ok
[INFO] [stdout] test src/lib.rs - (line 38) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::echelon_form (line 558) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::identity (line 183) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::empty (line 223) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::kron_with (line 1095) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::is_zero_at (line 392) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::dot_with_matrix (line 793) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::dot_with_vector (line 752) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::horizontal_concat_with (line 707) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::rank (line 538) ... ok
[INFO] [stdout] test src/lib.rs - (line 26) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::non_trivial_elements (line 476) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::is_one_at (line 410) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::new (line 56) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::push_row (line 299) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::solve (line 580) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::split_rows_bottom (line 987) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::transposed (line 516) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::keep_only_rows (line 860) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::row (line 428) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::row_weights (line 500) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::split_rows_top (line 956) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::nullspace (line 657) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::try_with_capacity (line 155) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::split_rows (line 923) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::vertical_concat_with (line 729) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVec::empty (line 53) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVec::zeros (line 33) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::zeros (line 204) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVec::to_positions_vec (line 72) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::try_new (line 83) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::rows (line 454) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::with_capacity (line 121) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::is_one_at (line 203) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::is_zero_at (line 185) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::without_columns (line 1066) ... ok
[INFO] [stdout] test src/matrix/mod.rs - matrix::SparseBinMat::without_rows (line 893) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::concat (line 263) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::bitwise_xor_with (line 390) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::new (line 88) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::iter_dense (line 241) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::try_new (line 108) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::dot_with (line 360) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::without_positions (line 321) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::keep_only_positions (line 289) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::non_trivial_positions (line 220) ... ok
[INFO] [stdout] test src/vector/mod.rs - vector::SparseBinVecBase<T>::get (line 159) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 52 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.21s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "168223b8499caf3f05287bff46f32abd99f22c9fb310eb1ce39d6e890ff6ed2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "168223b8499caf3f05287bff46f32abd99f22c9fb310eb1ce39d6e890ff6ed2e", kill_on_drop: false }`
[INFO] [stdout] 168223b8499caf3f05287bff46f32abd99f22c9fb310eb1ce39d6e890ff6ed2e
