[INFO] fetching crate ku 0.1.0...
[INFO] testing ku-0.1.0 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate ku 0.1.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate ku 0.1.0 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate ku 0.1.0
[INFO] finished tweaking crates.io crate ku 0.1.0
[INFO] tweaked toml for crates.io crate ku 0.1.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d36540331d3713ea87e5c3c9b0e0a3b063d456d1cdc96ae8448c878553932c94
[INFO] running `"docker" "start" "-a" "d36540331d3713ea87e5c3c9b0e0a3b063d456d1cdc96ae8448c878553932c94"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling ku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:53:14
[INFO] [stderr]    |
[INFO] [stderr] 53 |             0...49 => Unplayable,
[INFO] [stderr]    |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:54:15
[INFO] [stderr]    |
[INFO] [stderr] 54 |             50...150 => Beginner,
[INFO] [stderr]    |               ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:55:16
[INFO] [stderr]    |
[INFO] [stderr] 55 |             151...250 => Easy,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:56:16
[INFO] [stderr]    |
[INFO] [stderr] 56 |             251...400 => Intermediate,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:57:16
[INFO] [stderr]    |
[INFO] [stderr] 57 |             401...550 => Difficult,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:37:25
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let mut reader: Box<Read> = if matches.is_present("INPUT") {
[INFO] [stderr]    |                         ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.07s
[INFO] running `"docker" "inspect" "d36540331d3713ea87e5c3c9b0e0a3b063d456d1cdc96ae8448c878553932c94"`
[INFO] running `"docker" "rm" "-f" "d36540331d3713ea87e5c3c9b0e0a3b063d456d1cdc96ae8448c878553932c94"`
[INFO] [stdout] d36540331d3713ea87e5c3c9b0e0a3b063d456d1cdc96ae8448c878553932c94
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] de7bd7f93b05051bbc93629fddad653f2053b8aff1a8b5eb2927a9bc4684b1ba
[INFO] running `"docker" "start" "-a" "de7bd7f93b05051bbc93629fddad653f2053b8aff1a8b5eb2927a9bc4684b1ba"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling ku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:53:14
[INFO] [stderr]    |
[INFO] [stderr] 53 |             0...49 => Unplayable,
[INFO] [stderr]    |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:54:15
[INFO] [stderr]    |
[INFO] [stderr] 54 |             50...150 => Beginner,
[INFO] [stderr]    |               ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:55:16
[INFO] [stderr]    |
[INFO] [stderr] 55 |             151...250 => Easy,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:56:16
[INFO] [stderr]    |
[INFO] [stderr] 56 |             251...400 => Intermediate,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:57:16
[INFO] [stderr]    |
[INFO] [stderr] 57 |             401...550 => Difficult,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:37:25
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let mut reader: Box<Read> = if matches.is_present("INPUT") {
[INFO] [stderr]    |                         ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:37:25
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let mut reader: Box<Read> = if matches.is_present("INPUT") {
[INFO] [stderr]    |                         ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:53:14
[INFO] [stderr]    |
[INFO] [stderr] 53 |             0...49 => Unplayable,
[INFO] [stderr]    |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:54:15
[INFO] [stderr]    |
[INFO] [stderr] 54 |             50...150 => Beginner,
[INFO] [stderr]    |               ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:55:16
[INFO] [stderr]    |
[INFO] [stderr] 55 |             151...250 => Easy,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:56:16
[INFO] [stderr]    |
[INFO] [stderr] 56 |             251...400 => Intermediate,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:57:16
[INFO] [stderr]    |
[INFO] [stderr] 57 |             401...550 => Difficult,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:593:22
[INFO] [stderr]     |
[INFO] [stderr] 593 |                     0...2 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:594:22
[INFO] [stderr]     |
[INFO] [stderr] 594 |                     3...5 => 3,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:595:22
[INFO] [stderr]     |
[INFO] [stderr] 595 |                     6...8 => 6,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:599:22
[INFO] [stderr]     |
[INFO] [stderr] 599 |                     0...2 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:600:22
[INFO] [stderr]     |
[INFO] [stderr] 600 |                     3...5 => 3,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:601:22
[INFO] [stderr]     |
[INFO] [stderr] 601 |                     6...8 => 6,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:611:22
[INFO] [stderr]     |
[INFO] [stderr] 611 |                     0...3 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:612:22
[INFO] [stderr]     |
[INFO] [stderr] 612 |                     4...7 => 4,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:613:22
[INFO] [stderr]     |
[INFO] [stderr] 613 |                     8...11 => 8,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:614:23
[INFO] [stderr]     |
[INFO] [stderr] 614 |                     12...15 => 12,
[INFO] [stderr]     |                       ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:618:22
[INFO] [stderr]     |
[INFO] [stderr] 618 |                     0...3 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:619:22
[INFO] [stderr]     |
[INFO] [stderr] 619 |                     4...7 => 4,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:620:22
[INFO] [stderr]     |
[INFO] [stderr] 620 |                     8...11 => 8,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:621:23
[INFO] [stderr]     |
[INFO] [stderr] 621 |                     12...15 => 12,
[INFO] [stderr]     |                       ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stderr]    --> src/sudoku.rs:521:71
[INFO] [stderr]     |
[INFO] [stderr] 521 |         for vec in [vec![], vec![Some(Element(1)), Some(Element(2))]].into_iter() {
[INFO] [stderr]     |                                                                       ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(array_into_iter)]` on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stderr] 
[INFO] [stderr] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stderr]    --> src/sudoku.rs:531:77
[INFO] [stderr]     |
[INFO] [stderr] 531 |         for vec in [vec![], vec![Some(Element(2)), Some(Element(6)), None]].into_iter() {
[INFO] [stderr]     |                                                                             ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stderr] 
[INFO] [stderr] warning: 21 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.69s
[INFO] running `"docker" "inspect" "de7bd7f93b05051bbc93629fddad653f2053b8aff1a8b5eb2927a9bc4684b1ba"`
[INFO] running `"docker" "rm" "-f" "de7bd7f93b05051bbc93629fddad653f2053b8aff1a8b5eb2927a9bc4684b1ba"`
[INFO] [stdout] de7bd7f93b05051bbc93629fddad653f2053b8aff1a8b5eb2927a9bc4684b1ba
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 093bc0b5bff8ae06b65f94776ca4898e1a2216aa3ede5a4ad19b04a3ad3432be
[INFO] running `"docker" "start" "-a" "093bc0b5bff8ae06b65f94776ca4898e1a2216aa3ede5a4ad19b04a3ad3432be"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:53:14
[INFO] [stderr]    |
[INFO] [stderr] 53 |             0...49 => Unplayable,
[INFO] [stderr]    |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:54:15
[INFO] [stderr]    |
[INFO] [stderr] 54 |             50...150 => Beginner,
[INFO] [stderr]    |               ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:55:16
[INFO] [stderr]    |
[INFO] [stderr] 55 |             151...250 => Easy,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:56:16
[INFO] [stderr]    |
[INFO] [stderr] 56 |             251...400 => Intermediate,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:57:16
[INFO] [stderr]    |
[INFO] [stderr] 57 |             401...550 => Difficult,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:37:25
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let mut reader: Box<Read> = if matches.is_present("INPUT") {
[INFO] [stderr]    |                         ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:53:14
[INFO] [stderr]    |
[INFO] [stderr] 53 |             0...49 => Unplayable,
[INFO] [stderr]    |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:54:15
[INFO] [stderr]    |
[INFO] [stderr] 54 |             50...150 => Beginner,
[INFO] [stderr]    |               ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:55:16
[INFO] [stderr]    |
[INFO] [stderr] 55 |             151...250 => Easy,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:56:16
[INFO] [stderr]    |
[INFO] [stderr] 56 |             251...400 => Intermediate,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/sol.rs:57:16
[INFO] [stderr]    |
[INFO] [stderr] 57 |             401...550 => Difficult,
[INFO] [stderr]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:593:22
[INFO] [stderr]     |
[INFO] [stderr] 593 |                     0...2 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:594:22
[INFO] [stderr]     |
[INFO] [stderr] 594 |                     3...5 => 3,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:595:22
[INFO] [stderr]     |
[INFO] [stderr] 595 |                     6...8 => 6,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:599:22
[INFO] [stderr]     |
[INFO] [stderr] 599 |                     0...2 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:600:22
[INFO] [stderr]     |
[INFO] [stderr] 600 |                     3...5 => 3,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:601:22
[INFO] [stderr]     |
[INFO] [stderr] 601 |                     6...8 => 6,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:611:22
[INFO] [stderr]     |
[INFO] [stderr] 611 |                     0...3 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:612:22
[INFO] [stderr]     |
[INFO] [stderr] 612 |                     4...7 => 4,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:613:22
[INFO] [stderr]     |
[INFO] [stderr] 613 |                     8...11 => 8,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:614:23
[INFO] [stderr]     |
[INFO] [stderr] 614 |                     12...15 => 12,
[INFO] [stderr]     |                       ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:618:22
[INFO] [stderr]     |
[INFO] [stderr] 618 |                     0...3 => 0,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:619:22
[INFO] [stderr]     |
[INFO] [stderr] 619 |                     4...7 => 4,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:620:22
[INFO] [stderr]     |
[INFO] [stderr] 620 |                     8...11 => 8,
[INFO] [stderr]     |                      ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/sudoku.rs:621:23
[INFO] [stderr]     |
[INFO] [stderr] 621 |                     12...15 => 12,
[INFO] [stderr]     |                       ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stderr]    --> src/sudoku.rs:521:71
[INFO] [stderr]     |
[INFO] [stderr] 521 |         for vec in [vec![], vec![Some(Element(1)), Some(Element(2))]].into_iter() {
[INFO] [stderr]     |                                                                       ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(array_into_iter)]` on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:37:25
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let mut reader: Box<Read> = if matches.is_present("INPUT") {
[INFO] [stderr]    |                         ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stderr]    --> src/sudoku.rs:531:77
[INFO] [stderr]     |
[INFO] [stderr] 531 |         for vec in [vec![], vec![Some(Element(2)), Some(Element(6)), None]].into_iter() {
[INFO] [stderr]     |                                                                             ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stderr] 
[INFO] [stderr] warning: 21 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/sudoku-4016c3dbba1adbff
[INFO] [stdout] 
[INFO] [stdout] running 25 tests
[INFO] [stdout] test sudoku::tests::test_group_is_valid ... ok
[INFO] [stdout] test sudoku::tests::test_group_is_complete ... ok
[INFO] [stdout] test sudoku::tests::test_point_index ... ok
[INFO] [stdout] test sol::tests::test_set_eliminate ... ok
[INFO] [stdout] test sudoku::tests::test_point_index_mut ... ok
[INFO] [stdout] test sudoku::tests::test_point_compose ... ok
[INFO] [stdout] test sol::tests::test_map_new ... ok
[INFO] [stdout] test sol::tests::test_is_uniquely_solvable ... ok
[INFO] [stdout] test sudoku::tests::test_group_elements ... ok
[INFO] [stdout] test sol::tests::test_set_new ... ok
[INFO] [stdout] test sol::tests::test_set_freedom ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_from_str_parse_compose ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_groups_length_4_2d ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_from_str ... ok
[INFO] [stdout] test sudoku::tests::test_point_snap ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_groups_length_3_2d ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_new ... ok
[INFO] [stdout] test sol::tests::test_calculate_c ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_order ... ok
[INFO] [stdout] test sol::tests::test_map_from_sudoku ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_groups_index_y_4 ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_groups_index_x_4 ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_groups_index_x_3 ... ok
[INFO] [stdout] test sudoku::tests::test_sudoku_groups_index_y_3 ... ok
[INFO] [stdout] test gen::tests::test_grid ... ok
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/ku-b21ba06f1d935135
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/sol-1760831a923041c7
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test test_solve_o4_2d ... ignored
[INFO] [stdout] test test_uniquely_solveable ... ignored
[INFO] [stdout] test test_group_is_complete_and_is_valid ... ok
[INFO] [stdout] test test_solve_o3_2d ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests sudoku
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "093bc0b5bff8ae06b65f94776ca4898e1a2216aa3ede5a4ad19b04a3ad3432be"`
[INFO] running `"docker" "rm" "-f" "093bc0b5bff8ae06b65f94776ca4898e1a2216aa3ede5a4ad19b04a3ad3432be"`
[INFO] [stdout] 093bc0b5bff8ae06b65f94776ca4898e1a2216aa3ede5a4ad19b04a3ad3432be