[INFO] updating cached repository https://github.com/lesguillemets/effective-fortnight
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b2cd88ee8005042e87ea682c8dac2e5b183c94de
[INFO] testing lesguillemets/effective-fortnight against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flesguillemets%2Feffective-fortnight" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lesguillemets/effective-fortnight on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lesguillemets/effective-fortnight
[INFO] finished tweaking git repo https://github.com/lesguillemets/effective-fortnight
[INFO] tweaked toml for git repo https://github.com/lesguillemets/effective-fortnight written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/lesguillemets/effective-fortnight already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a9af42062bfa7f02e2938617c64a537d426205f0dcfcec46652a3925e3dbd3a7
[INFO] running `Command { std: "docker" "start" "-a" "a9af42062bfa7f02e2938617c64a537d426205f0dcfcec46652a3925e3dbd3a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9af42062bfa7f02e2938617c64a537d426205f0dcfcec46652a3925e3dbd3a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9af42062bfa7f02e2938617c64a537d426205f0dcfcec46652a3925e3dbd3a7", kill_on_drop: false }`
[INFO] [stdout] a9af42062bfa7f02e2938617c64a537d426205f0dcfcec46652a3925e3dbd3a7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 245e74d571626352ee6d4cab37f0c1cb09fd18afa8e4f6ee1da6fe5abee247ff
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "245e74d571626352ee6d4cab37f0c1cb09fd18afa8e4f6ee1da6fe5abee247ff", kill_on_drop: false }`
[INFO] [stderr]    Compiling rayon-core v1.0.0
[INFO] [stderr]    Compiling byteorder v1.0.0
[INFO] [stderr]    Compiling adler32 v1.0.0
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling num_cpus v1.3.0
[INFO] [stderr]    Compiling num-integer v0.1.34
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling gif v0.9.1
[INFO] [stderr]    Compiling deflate v0.7.6
[INFO] [stderr]    Compiling num-iter v0.1.33
[INFO] [stderr]    Compiling num-rational v0.1.36
[INFO] [stderr]    Compiling deque v0.3.1
[INFO] [stderr]    Compiling png v0.6.2
[INFO] [stderr]    Compiling rayon v0.7.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.12
[INFO] [stderr]    Compiling image v0.12.3
[INFO] [stderr]    Compiling colourful-converter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `ColorType`, `Rgb`
[INFO] [stdout]  --> src/decode.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use image::{ColorType, Rgb, Pixel};
[INFO] [stdout]   |             ^^^^^^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     /// decode the encoded file to validate
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 20 |     let test_file = from_file.clone() + ".redecoded";
[INFO] [stdout]    |     ------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `GenericImage`
[INFO] [stdout]  --> src/decode.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use image::{GenericImage, ImageDecoder};
[INFO] [stdout]   |             ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Pixel`
[INFO] [stdout]  --> src/decode.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 | use image::{ColorType, Rgb, Pixel};
[INFO] [stdout]   |                             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> src/decode.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let (w, h) = decoder.dimensions().expect("cannot get file dimensions");
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/decode.rs:73:60
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut x = header.chunks(3).enumerate().skip_while(|&(i, p)| is_empty(p));
[INFO] [stdout]    |                                                            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut outf = &mut File::create(&Path::new(to_file)).expect("fileerror");
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/decode.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut header = body.next().expect("empty body");
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     test.write(&decode_file("out.png"));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     image::ImageRgb8(imgbuf).save(outf, image::PNG);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.84s
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "245e74d571626352ee6d4cab37f0c1cb09fd18afa8e4f6ee1da6fe5abee247ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "245e74d571626352ee6d4cab37f0c1cb09fd18afa8e4f6ee1da6fe5abee247ff", kill_on_drop: false }`
[INFO] [stdout] 245e74d571626352ee6d4cab37f0c1cb09fd18afa8e4f6ee1da6fe5abee247ff
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6b1f64db527246719b4c300d33b81f4eb9cb04f2695598e982487feaa7245874
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6b1f64db527246719b4c300d33b81f4eb9cb04f2695598e982487feaa7245874", kill_on_drop: false }`
[INFO] [stderr]    Compiling colourful-converter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `ColorType`, `Rgb`
[INFO] [stdout]  --> src/decode.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use image::{ColorType, Rgb, Pixel};
[INFO] [stdout]   |             ^^^^^^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     /// decode the encoded file to validate
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 20 |     let test_file = from_file.clone() + ".redecoded";
[INFO] [stdout]    |     ------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `GenericImage`
[INFO] [stdout]  --> src/decode.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use image::{GenericImage, ImageDecoder};
[INFO] [stdout]   |             ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Pixel`
[INFO] [stdout]  --> src/decode.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 | use image::{ColorType, Rgb, Pixel};
[INFO] [stdout]   |                             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> src/decode.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let (w, h) = decoder.dimensions().expect("cannot get file dimensions");
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/decode.rs:73:60
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut x = header.chunks(3).enumerate().skip_while(|&(i, p)| is_empty(p));
[INFO] [stdout]    |                                                            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut outf = &mut File::create(&Path::new(to_file)).expect("fileerror");
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/decode.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut header = body.next().expect("empty body");
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     test.write(&decode_file("out.png"));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     image::ImageRgb8(imgbuf).save(outf, image::PNG);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.98s
[INFO] running `Command { std: "docker" "inspect" "6b1f64db527246719b4c300d33b81f4eb9cb04f2695598e982487feaa7245874", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b1f64db527246719b4c300d33b81f4eb9cb04f2695598e982487feaa7245874", kill_on_drop: false }`
[INFO] [stdout] 6b1f64db527246719b4c300d33b81f4eb9cb04f2695598e982487feaa7245874
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 874b38e34c451e2611055bc9ef07133a96d3811d347e8df7e3361dc3fc369e91
[INFO] running `Command { std: "docker" "start" "-a" "874b38e34c451e2611055bc9ef07133a96d3811d347e8df7e3361dc3fc369e91", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `ColorType`, `Rgb`
[INFO] [stderr]  --> src/decode.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 | use image::{ColorType, Rgb, Pixel};
[INFO] [stderr]   |             ^^^^^^^^^  ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/main.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     /// decode the encoded file to validate
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 20 |     let test_file = from_file.clone() + ".redecoded";
[INFO] [stderr]    |     ------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `GenericImage`
[INFO] [stderr]  --> src/decode.rs:3:13
[INFO] [stderr]   |
[INFO] [stderr] 3 | use image::{GenericImage, ImageDecoder};
[INFO] [stderr]   |             ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Pixel`
[INFO] [stderr]  --> src/decode.rs:4:29
[INFO] [stderr]   |
[INFO] [stderr] 4 | use image::{ColorType, Rgb, Pixel};
[INFO] [stderr]   |                             ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `w`
[INFO] [stderr]   --> src/decode.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let (w, h) = decoder.dimensions().expect("cannot get file dimensions");
[INFO] [stderr]    |          ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/decode.rs:73:60
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut x = header.chunks(3).enumerate().skip_while(|&(i, p)| is_empty(p));
[INFO] [stderr]    |                                                            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut outf = &mut File::create(&Path::new(to_file)).expect("fileerror");
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/decode.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |     let mut header = body.next().expect("empty body");
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     test.write(&decode_file("out.png"));
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     image::ImageRgb8(imgbuf).save(outf, image::PNG);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.17s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/colourful_converter-d12f200f9fc2b08e
[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 `Command { std: "docker" "inspect" "874b38e34c451e2611055bc9ef07133a96d3811d347e8df7e3361dc3fc369e91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "874b38e34c451e2611055bc9ef07133a96d3811d347e8df7e3361dc3fc369e91", kill_on_drop: false }`
[INFO] [stdout] 874b38e34c451e2611055bc9ef07133a96d3811d347e8df7e3361dc3fc369e91