[INFO] fetching crate quantizr 1.4.3...
[INFO] testing quantizr-1.4.3 against beta-2025-09-21 for beta-1.91-3
[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-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "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-2025-09-21" "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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3f53a54f4aff6c4120189d1d0415eda90cacf83295584cf89c8ef3ff848af4bf
[INFO] running `Command { std: "docker" "start" "-a" "3f53a54f4aff6c4120189d1d0415eda90cacf83295584cf89c8ef3ff848af4bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f53a54f4aff6c4120189d1d0415eda90cacf83295584cf89c8ef3ff848af4bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f53a54f4aff6c4120189d1d0415eda90cacf83295584cf89c8ef3ff848af4bf", kill_on_drop: false }`
[INFO] [stdout] 3f53a54f4aff6c4120189d1d0415eda90cacf83295584cf89c8ef3ff848af4bf
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0e8b4cc453bb93f45659b00dca8261b2dbe92d4c0e8e893e19be417ffd5b0d1a
[INFO] running `Command { std: "docker" "start" "-a" "0e8b4cc453bb93f45659b00dca8261b2dbe92d4c0e8e893e19be417ffd5b0d1a", kill_on_drop: false }`
[INFO] [stderr]    Compiling quantizr v1.4.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `Command { std: "docker" "inspect" "0e8b4cc453bb93f45659b00dca8261b2dbe92d4c0e8e893e19be417ffd5b0d1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e8b4cc453bb93f45659b00dca8261b2dbe92d4c0e8e893e19be417ffd5b0d1a", kill_on_drop: false }`
[INFO] [stdout] 0e8b4cc453bb93f45659b00dca8261b2dbe92d4c0e8e893e19be417ffd5b0d1a
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 377ac1ce71c879e57db5dd5c1b87d2b2527d3dd385c77265dd61cfc752ac8550
[INFO] running `Command { std: "docker" "start" "-a" "377ac1ce71c879e57db5dd5c1b87d2b2527d3dd385c77265dd61cfc752ac8550", kill_on_drop: false }`
[INFO] [stderr]    Compiling quantizr v1.4.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "377ac1ce71c879e57db5dd5c1b87d2b2527d3dd385c77265dd61cfc752ac8550", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "377ac1ce71c879e57db5dd5c1b87d2b2527d3dd385c77265dd61cfc752ac8550", kill_on_drop: false }`
[INFO] [stdout] 377ac1ce71c879e57db5dd5c1b87d2b2527d3dd385c77265dd61cfc752ac8550
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] cda3bfbc4aa47507fe3fa4d4a3db96b0720ee8c673eb6ef6b26ec32c5dc22a5a
[INFO] running `Command { std: "docker" "start" "-a" "cda3bfbc4aa47507fe3fa4d4a3db96b0720ee8c673eb6ef6b26ec32c5dc22a5a", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/quantizr-404321abac051976)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test ord_float::tests::test_ordfloat32_ge ... ok
[INFO] [stdout] test ord_float::tests::test_ordfloat32_le ... ok
[INFO] [stdout] test ord_float::tests::test_ordfloat32_gt ... ok
[INFO] [stdout] test ord_float::tests::test_ordfloat32_lt ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests quantizr
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - (line 28) ... FAILED
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[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] 21 | let mut indexes1 = vec![0u8; width * height];
[INFO] [stdout]    |                              ^^^^^ help: a local variable with a similar name exists: `width1`
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `height` in this scope
[INFO] [stdout]   --> src/lib.rs:46:38
[INFO] [stdout]    |
[INFO] [stdout] 21 | let mut indexes1 = vec![0u8; width * height];
[INFO] [stdout]    |                                      ^^^^^^ help: a local variable with a similar name exists: `height1`
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `width` in this scope
[INFO] [stdout]   --> src/lib.rs:49:30
[INFO] [stdout]    |
[INFO] [stdout] 24 | let mut indexes2 = vec![0u8; width * height];
[INFO] [stdout]    |                              ^^^^^ help: a local variable with a similar name exists: `width1`
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `height` in this scope
[INFO] [stdout]   --> src/lib.rs:49:38
[INFO] [stdout]    |
[INFO] [stdout] 24 | let mut indexes2 = vec![0u8; width * height];
[INFO] [stdout]    |                                      ^^^^^^ help: a local variable with a similar name exists: `height1`
[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] 7 | 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] 4 | 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] 8 | 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] 4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 5 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 30| save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 31+     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] 11 | 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]  4 | 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] 12 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 30 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 31 +     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]  4 | 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] 16 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 30 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 31 +     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]  4 | 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] 19 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 30 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 31 +     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]  4 | 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] 22 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 30 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 31 +     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]  4 | 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] 25 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_28_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let mut hist = quantizr::Histogram::new();
[INFO] [stdout] ...
[INFO] [stdout] 30 | save_image2(palette, indexes2, width2, height2);
[INFO] [stdout] 31 +     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] 29 | 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] 30 | 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] 5 | 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] 4 | 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] 7 | 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] 4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 5 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 20| save_image(palette, indexes, width, height);
[INFO] [stdout] 21+     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]  4 | 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] 10 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 20 | save_image(palette, indexes, width, height);
[INFO] [stdout] 21 +     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]  4 | 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] 13 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 20 | save_image(palette, indexes, width, height);
[INFO] [stdout] 21 +     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]  4 | 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] 16 | 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]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_5_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | let (bytes, width, height) = load_image();
[INFO] [stdout] ...
[INFO] [stdout] 20 | save_image(palette, indexes, width, height);
[INFO] [stdout] 21 +     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] 20 | 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 0.15s
[INFO] [stdout] 
[INFO] [stdout] all doctests ran in 0.32s; merged doctests compilation took 0.17s
[INFO] running `Command { std: "docker" "inspect" "cda3bfbc4aa47507fe3fa4d4a3db96b0720ee8c673eb6ef6b26ec32c5dc22a5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cda3bfbc4aa47507fe3fa4d4a3db96b0720ee8c673eb6ef6b26ec32c5dc22a5a", kill_on_drop: false }`
[INFO] [stdout] cda3bfbc4aa47507fe3fa4d4a3db96b0720ee8c673eb6ef6b26ec32c5dc22a5a
