[INFO] cloning repository https://github.com/Trombecher/labuf
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Trombecher/labuf" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrombecher%2Flabuf", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrombecher%2Flabuf'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 73f076edee06552440fd282e869ed9ccda6384cf
[INFO] checking Trombecher/labuf against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrombecher%2Flabuf" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Trombecher/labuf
[INFO] finished tweaking git repo https://github.com/Trombecher/labuf
[INFO] tweaked toml for git repo https://github.com/Trombecher/labuf written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Trombecher/labuf on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Trombecher/labuf 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bb7e1ce0a096139a24fb9372d581c22c1edd18d558fce85649490c2e007ec8aa
[INFO] running `Command { std: "docker" "start" "-a" "bb7e1ce0a096139a24fb9372d581c22c1edd18d558fce85649490c2e007ec8aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb7e1ce0a096139a24fb9372d581c22c1edd18d558fce85649490c2e007ec8aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb7e1ce0a096139a24fb9372d581c22c1edd18d558fce85649490c2e007ec8aa", kill_on_drop: false }`
[INFO] [stdout] bb7e1ce0a096139a24fb9372d581c22c1edd18d558fce85649490c2e007ec8aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] da11a5e3f4d52fb39f1a4b31bb2d838749385d80ff830ef70d19f59ffd2b7225
[INFO] running `Command { std: "docker" "start" "-a" "da11a5e3f4d52fb39f1a4b31bb2d838749385d80ff830ef70d19f59ffd2b7225", kill_on_drop: false }`
[INFO] [stderr]     Checking fallible-iterator v0.3.0
[INFO] [stderr]     Checking labuf v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:10:16
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert_eq!(lab.peek(), Ok(Some(&1)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:10:28
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert_eq!(lab.peek(), Ok(Some(&1)));
[INFO] [stdout]    |                            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert_eq!(lab.peek(), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert_eq!(lab.peek(), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert_eq!(lab.peek(), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert_eq!(lab.peek(), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:11:16
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:11:31
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |                               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:12:16
[INFO] [stdout]    |
[INFO] [stdout] 12 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:12:31
[INFO] [stdout]    |
[INFO] [stdout] 12 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |                               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     assert_eq!(lab.peek_n(0), Ok(Some(&1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:13:16
[INFO] [stdout]    |
[INFO] [stdout] 13 |     assert_eq!(lab.peek_n(1), Ok(Some(&2)));
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:13:31
[INFO] [stdout]    |
[INFO] [stdout] 13 |     assert_eq!(lab.peek_n(1), Ok(Some(&2)));
[INFO] [stdout]    |                               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     assert_eq!(lab.peek_n(1), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     assert_eq!(lab.peek_n(1), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     assert_eq!(lab.peek_n(1), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     assert_eq!(lab.peek_n(1), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:14:16
[INFO] [stdout]    |
[INFO] [stdout] 14 |     assert_eq!(lab.peek_n(2), Ok(Some(&3)));
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:14:31
[INFO] [stdout]    |
[INFO] [stdout] 14 |     assert_eq!(lab.peek_n(2), Ok(Some(&3)));
[INFO] [stdout]    |                               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     assert_eq!(lab.peek_n(2), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     assert_eq!(lab.peek_n(2), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     assert_eq!(lab.peek_n(2), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     assert_eq!(lab.peek_n(2), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:15:16
[INFO] [stdout]    |
[INFO] [stdout] 15 |     assert_eq!(lab.peek_n(3), Ok(Some(&4)));
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:15:31
[INFO] [stdout]    |
[INFO] [stdout] 15 |     assert_eq!(lab.peek_n(3), Ok(Some(&4)));
[INFO] [stdout]    |                               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     assert_eq!(lab.peek_n(3), Ok(Some(&4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     assert_eq!(lab.peek_n(3), Ok(Some(&4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     assert_eq!(lab.peek_n(3), Ok(Some(&4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     assert_eq!(lab.peek_n(3), Ok(Some(&4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:16:16
[INFO] [stdout]    |
[INFO] [stdout] 16 |     assert_eq!(lab.peek_n(4), Ok(Some(&5)));
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:16:31
[INFO] [stdout]    |
[INFO] [stdout] 16 |     assert_eq!(lab.peek_n(4), Ok(Some(&5)));
[INFO] [stdout]    |                               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     assert_eq!(lab.peek_n(4), Ok(Some(&5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     assert_eq!(lab.peek_n(4), Ok(Some(&5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     assert_eq!(lab.peek_n(4), Ok(Some(&5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     assert_eq!(lab.peek_n(4), Ok(Some(&5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:17:16
[INFO] [stdout]    |
[INFO] [stdout] 17 |     assert_eq!(lab.peek_n(5), Ok(None));
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:17:31
[INFO] [stdout]    |
[INFO] [stdout] 17 |     assert_eq!(lab.peek_n(5), Ok(None));
[INFO] [stdout]    |                               ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     assert_eq!(lab.peek_n(5), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     assert_eq!(lab.peek_n(5), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     assert_eq!(lab.peek_n(5), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     assert_eq!(lab.peek_n(5), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:18:16
[INFO] [stdout]    |
[INFO] [stdout] 18 |     assert_eq!(lab.peek_n(423423), Ok(None));
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     assert_eq!(lab.peek_n(423423), Ok(None));
[INFO] [stdout]    |                                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     assert_eq!(lab.peek_n(423423), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     assert_eq!(lab.peek_n(423423), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     assert_eq!(lab.peek_n(423423), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     assert_eq!(lab.peek_n(423423), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:26:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     assert_eq!(lab.peek(), Ok(Some(&2)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:26:28
[INFO] [stdout]    |
[INFO] [stdout] 26 |     assert_eq!(lab.peek(), Ok(Some(&2)));
[INFO] [stdout]    |                            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     assert_eq!(lab.peek(), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     assert_eq!(lab.peek(), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     assert_eq!(lab.peek(), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     assert_eq!(lab.peek(), Ok(Some(&2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:28:16
[INFO] [stdout]    |
[INFO] [stdout] 28 |     assert_eq!(lab.peek(), Ok(Some(&3)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:28:28
[INFO] [stdout]    |
[INFO] [stdout] 28 |     assert_eq!(lab.peek(), Ok(Some(&3)));
[INFO] [stdout]    |                            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     assert_eq!(lab.peek(), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     assert_eq!(lab.peek(), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     assert_eq!(lab.peek(), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     assert_eq!(lab.peek(), Ok(Some(&3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:35:16
[INFO] [stdout]    |
[INFO] [stdout] 35 |     assert_eq!(lab.peek(), Ok(None));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:35:28
[INFO] [stdout]    |
[INFO] [stdout] 35 |     assert_eq!(lab.peek(), Ok(None));
[INFO] [stdout]    |                            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     assert_eq!(lab.peek(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     assert_eq!(lab.peek(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     assert_eq!(lab.peek(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<&i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     assert_eq!(lab.peek(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<[Option<&i32>; 6], Infallible>
[INFO] [stdout]   --> src/tests.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |         lab.peek_multiple::<6>(),
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<[Option<&i32>; 6], Infallible>
[INFO] [stdout]   --> src/tests.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |         Ok([Some(&1), Some(&2), Some(&3), Some(&4), Some(&5), None])
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<[Option<&i32>; 6], Infallible>
[INFO] [stdout]   --> src/tests.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | /     assert_eq!(
[INFO] [stdout] 43 | |         lab.peek_multiple::<6>(),
[INFO] [stdout] 44 | |         Ok([Some(&1), Some(&2), Some(&3), Some(&4), Some(&5), None])
[INFO] [stdout] 45 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<[Option<&i32>; 6], Infallible>
[INFO] [stdout]   --> src/tests.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | /     assert_eq!(
[INFO] [stdout] 43 | |         lab.peek_multiple::<6>(),
[INFO] [stdout] 44 | |         Ok([Some(&1), Some(&2), Some(&3), Some(&4), Some(&5), None])
[INFO] [stdout] 45 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<[Option<&i32>; 6], Infallible>
[INFO] [stdout]   --> src/tests.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | /     assert_eq!(
[INFO] [stdout] 43 | |         lab.peek_multiple::<6>(),
[INFO] [stdout] 44 | |         Ok([Some(&1), Some(&2), Some(&3), Some(&4), Some(&5), None])
[INFO] [stdout] 45 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<[Option<&i32>; 6], Infallible>
[INFO] [stdout]   --> src/tests.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | /     assert_eq!(
[INFO] [stdout] 43 | |         lab.peek_multiple::<6>(),
[INFO] [stdout] 44 | |         Ok([Some(&1), Some(&2), Some(&3), Some(&4), Some(&5), None])
[INFO] [stdout] 45 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:51:16
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert_eq!(lab.next(), Ok(Some(1)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:51:28
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert_eq!(lab.next(), Ok(Some(1)));
[INFO] [stdout]    |                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert_eq!(lab.next(), Ok(Some(1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert_eq!(lab.next(), Ok(Some(1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert_eq!(lab.next(), Ok(Some(1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     assert_eq!(lab.next(), Ok(Some(1)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:52:16
[INFO] [stdout]    |
[INFO] [stdout] 52 |     assert_eq!(lab.next(), Ok(Some(2)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:52:28
[INFO] [stdout]    |
[INFO] [stdout] 52 |     assert_eq!(lab.next(), Ok(Some(2)));
[INFO] [stdout]    |                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     assert_eq!(lab.next(), Ok(Some(2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     assert_eq!(lab.next(), Ok(Some(2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     assert_eq!(lab.next(), Ok(Some(2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     assert_eq!(lab.next(), Ok(Some(2)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:53:16
[INFO] [stdout]    |
[INFO] [stdout] 53 |     assert_eq!(lab.next(), Ok(Some(3)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:53:28
[INFO] [stdout]    |
[INFO] [stdout] 53 |     assert_eq!(lab.next(), Ok(Some(3)));
[INFO] [stdout]    |                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     assert_eq!(lab.next(), Ok(Some(3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     assert_eq!(lab.next(), Ok(Some(3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     assert_eq!(lab.next(), Ok(Some(3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     assert_eq!(lab.next(), Ok(Some(3)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:54:16
[INFO] [stdout]    |
[INFO] [stdout] 54 |     assert_eq!(lab.next(), Ok(Some(4)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:54:28
[INFO] [stdout]    |
[INFO] [stdout] 54 |     assert_eq!(lab.next(), Ok(Some(4)));
[INFO] [stdout]    |                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     assert_eq!(lab.next(), Ok(Some(4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     assert_eq!(lab.next(), Ok(Some(4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     assert_eq!(lab.next(), Ok(Some(4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     assert_eq!(lab.next(), Ok(Some(4)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:55:16
[INFO] [stdout]    |
[INFO] [stdout] 55 |     assert_eq!(lab.next(), Ok(Some(5)));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:55:28
[INFO] [stdout]    |
[INFO] [stdout] 55 |     assert_eq!(lab.next(), Ok(Some(5)));
[INFO] [stdout]    |                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     assert_eq!(lab.next(), Ok(Some(5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     assert_eq!(lab.next(), Ok(Some(5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     assert_eq!(lab.next(), Ok(Some(5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     assert_eq!(lab.next(), Ok(Some(5)));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:56:16
[INFO] [stdout]    |
[INFO] [stdout] 56 |     assert_eq!(lab.next(), Ok(None));
[INFO] [stdout]    |                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:56:28
[INFO] [stdout]    |
[INFO] [stdout] 56 |     assert_eq!(lab.next(), Ok(None));
[INFO] [stdout]    |                            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 |     assert_eq!(lab.next(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 |     assert_eq!(lab.next(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 |     assert_eq!(lab.next(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]   --> src/tests.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 |     assert_eq!(lab.next(), Ok(None));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `labuf` (lib test) due to 114 previous errors
[INFO] running `Command { std: "docker" "inspect" "da11a5e3f4d52fb39f1a4b31bb2d838749385d80ff830ef70d19f59ffd2b7225", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da11a5e3f4d52fb39f1a4b31bb2d838749385d80ff830ef70d19f59ffd2b7225", kill_on_drop: false }`
[INFO] [stdout] da11a5e3f4d52fb39f1a4b31bb2d838749385d80ff830ef70d19f59ffd2b7225
