[INFO] fetching crate quantizr 1.4.3...
[INFO] testing quantizr-1.4.3 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate quantizr 1.4.3 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate quantizr 1.4.3
[INFO] finished tweaking crates.io crate quantizr 1.4.3
[INFO] tweaked toml for crates.io crate quantizr 1.4.3 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate quantizr 1.4.3 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate quantizr 1.4.3 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" "+beta-2026-04-21" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8581bfd4d6e76df3f00f02121b2f10ff3be4c481bf93cba996ce03f918c2ad9d
[INFO] running `Command { std: "docker" "start" "-a" "8581bfd4d6e76df3f00f02121b2f10ff3be4c481bf93cba996ce03f918c2ad9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8581bfd4d6e76df3f00f02121b2f10ff3be4c481bf93cba996ce03f918c2ad9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8581bfd4d6e76df3f00f02121b2f10ff3be4c481bf93cba996ce03f918c2ad9d", kill_on_drop: false }`
[INFO] [stdout] 8581bfd4d6e76df3f00f02121b2f10ff3be4c481bf93cba996ce03f918c2ad9d
[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=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" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ae0917c01035cd2050034d658ba18be06a2ed08316294d63aa5f19ad22aad063
[INFO] running `Command { std: "docker" "start" "-a" "ae0917c01035cd2050034d658ba18be06a2ed08316294d63aa5f19ad22aad063", kill_on_drop: false }`
[INFO] [stderr]    Compiling quantizr v1.4.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `Command { std: "docker" "inspect" "ae0917c01035cd2050034d658ba18be06a2ed08316294d63aa5f19ad22aad063", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae0917c01035cd2050034d658ba18be06a2ed08316294d63aa5f19ad22aad063", kill_on_drop: false }`
[INFO] [stdout] ae0917c01035cd2050034d658ba18be06a2ed08316294d63aa5f19ad22aad063
[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=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" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5e2918f2c02cf4dc82f0ffc82f8e5d51b2e14e3125990f83807a56f732034307
[INFO] running `Command { std: "docker" "start" "-a" "5e2918f2c02cf4dc82f0ffc82f8e5d51b2e14e3125990f83807a56f732034307", kill_on_drop: false }`
[INFO] [stderr]    Compiling quantizr v1.4.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "5e2918f2c02cf4dc82f0ffc82f8e5d51b2e14e3125990f83807a56f732034307", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e2918f2c02cf4dc82f0ffc82f8e5d51b2e14e3125990f83807a56f732034307", kill_on_drop: false }`
[INFO] [stdout] 5e2918f2c02cf4dc82f0ffc82f8e5d51b2e14e3125990f83807a56f732034307
[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=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" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8c82e77d2cb6fc529a4894e60c7b0302728ae8d8dbbacf6a02b773ca478e621d
[INFO] running `Command { std: "docker" "start" "-a" "8c82e77d2cb6fc529a4894e60c7b0302728ae8d8dbbacf6a02b773ca478e621d", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/quantizr-c7b81dfa2009600b)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test ord_float::tests::test_ordfloat32_gt ... ok
[INFO] [stderr]    Doc-tests quantizr
[INFO] [stdout] test ord_float::tests::test_ordfloat32_lt ... ok
[INFO] [stdout] test ord_float::tests::test_ordfloat32_le ... ok
[INFO] [stdout] test ord_float::tests::test_ordfloat32_ge ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - (line 28) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 5) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 28) stdout ----
[INFO] [stdout] error[E0425]: cannot find value `width` in this scope
[INFO] [stdout]   --> src/lib.rs:46:30
[INFO] [stdout]    |
[INFO] [stdout] 46 | let mut indexes1 = vec![0u8; width * height];
[INFO] [stdout]    |                              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: a local variable with a similar name exists
[INFO] [stdout]    |
[INFO] [stdout] 46 | let mut indexes1 = vec![0u8; width1 * height];
[INFO] [stdout]    |                                   +
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `height` in this scope
[INFO] [stdout]   --> src/lib.rs:46:38
[INFO] [stdout]    |
[INFO] [stdout] 46 | let mut indexes1 = vec![0u8; width * height];
[INFO] [stdout]    |                                      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: a local variable with a similar name exists
[INFO] [stdout]    |
[INFO] [stdout] 46 | let mut indexes1 = vec![0u8; width * height1];
[INFO] [stdout]    |                                            +
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `width` in this scope
[INFO] [stdout]   --> src/lib.rs:49:30
[INFO] [stdout]    |
[INFO] [stdout] 49 | let mut indexes2 = vec![0u8; width * height];
[INFO] [stdout]    |                              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: a local variable with a similar name exists
[INFO] [stdout]    |
[INFO] [stdout] 49 | let mut indexes2 = vec![0u8; width1 * height];
[INFO] [stdout]    |                                   +
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `height` in this scope
[INFO] [stdout]   --> src/lib.rs:49:38
[INFO] [stdout]    |
[INFO] [stdout] 49 | let mut indexes2 = vec![0u8; width * height];
[INFO] [stdout]    |                                      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: a local variable with a similar name exists
[INFO] [stdout]    |
[INFO] [stdout] 49 | let mut indexes2 = vec![0u8; width * height1];
[INFO] [stdout]    |                                            +
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `load_image1` in this scope
[INFO] [stdout]   --> src/lib.rs:32:33
[INFO] [stdout]    |
[INFO] [stdout] 32 | let (bytes1, width1, height1) = load_image1();
[INFO] [stdout]    |                                 ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:33:59
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 33 | let image1 = quantizr::Image::new(bytes1, width1, height1)?;
[INFO] [stdout]    |                                                           ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 29 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 30 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 55 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 56 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `load_image2` in this scope
[INFO] [stdout]   --> src/lib.rs:36:33
[INFO] [stdout]    |
[INFO] [stdout] 36 | let (bytes2, width2, height2) = load_image2();
[INFO] [stdout]    |                                 ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:37:59
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 37 | let image2 = quantizr::Image::new(bytes2, width2, height2)?;
[INFO] [stdout]    |                                                           ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 29 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 30 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 55 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 56 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:41:25
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 41 | opts.set_max_colors(256)?;
[INFO] [stdout]    |                         ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 29 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 30 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 55 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 56 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:44:32
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 44 | result.set_dithering_level(1.0)?;
[INFO] [stdout]    |                                ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 29 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 30 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 55 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 56 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:47:53
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 47 | result.remap_image(&image1, indexes1.as_mut_slice())?;
[INFO] [stdout]    |                                                     ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 29 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 30 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 55 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 56 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:50:53
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 50 | result.remap_image(&image2, indexes2.as_mut_slice())?;
[INFO] [stdout]    |                                                     ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 29 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 30 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 55 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 56 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `save_image1` in this scope
[INFO] [stdout]   --> src/lib.rs:54:1
[INFO] [stdout]    |
[INFO] [stdout] 54 | save_image1(palette, indexes1, width1, height1);
[INFO] [stdout]    | ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `save_image2` in this scope
[INFO] [stdout]   --> src/lib.rs:55:1
[INFO] [stdout]    |
[INFO] [stdout] 55 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout]    | ^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 14 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0425.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 5) stdout ----
[INFO] [stdout] error[E0425]: cannot find function `load_image` in this scope
[INFO] [stdout]  --> src/lib.rs:7:30
[INFO] [stdout]   |
[INFO] [stdout] 7 | let (bytes, width, height) = load_image();
[INFO] [stdout]   |                              ^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:9:55
[INFO] [stdout]    |
[INFO] [stdout]  6 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout]  9 | let image = quantizr::Image::new(bytes, width, height)?;
[INFO] [stdout]    |                                                       ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  6 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  7 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 22 | save_image(palette, indexes, width, height);
[INFO] [stdout] 23 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout]  6 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 12 | opts.set_max_colors(256)?;
[INFO] [stdout]    |                         ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  6 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  7 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 22 | save_image(palette, indexes, width, height);
[INFO] [stdout] 23 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:15:32
[INFO] [stdout]    |
[INFO] [stdout]  6 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 15 | result.set_dithering_level(1.0)?;
[INFO] [stdout]    |                                ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  6 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  7 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 22 | save_image(palette, indexes, width, height);
[INFO] [stdout] 23 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:18:51
[INFO] [stdout]    |
[INFO] [stdout]  6 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 18 | result.remap_image(&image, indexes.as_mut_slice())?;
[INFO] [stdout]    |                                                   ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  6 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  7 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 22 | save_image(palette, indexes, width, height);
[INFO] [stdout] 23 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `save_image` in this scope
[INFO] [stdout]   --> src/lib.rs:22:1
[INFO] [stdout]    |
[INFO] [stdout] 22 | save_image(palette, indexes, width, height);
[INFO] [stdout]    | ^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0425.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 28)
[INFO] [stdout]     src/lib.rs - (line 5)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.20s
[INFO] [stdout] 
[INFO] [stdout] all doctests ran in 0.33s; merged doctests compilation took 0.12s
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "8c82e77d2cb6fc529a4894e60c7b0302728ae8d8dbbacf6a02b773ca478e621d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c82e77d2cb6fc529a4894e60c7b0302728ae8d8dbbacf6a02b773ca478e621d", kill_on_drop: false }`
[INFO] [stdout] 8c82e77d2cb6fc529a4894e60c7b0302728ae8d8dbbacf6a02b773ca478e621d
