[INFO] cloning repository https://github.com/PeronTheDuck/rust_Floyd_Steinberg_dithering
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PeronTheDuck/rust_Floyd_Steinberg_dithering" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPeronTheDuck%2Frust_Floyd_Steinberg_dithering", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPeronTheDuck%2Frust_Floyd_Steinberg_dithering'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c393ff7f362813a2cc6287a1810927f28f4b2627
[INFO] checking PeronTheDuck/rust_Floyd_Steinberg_dithering against try#9cfe725f0995b018340c519db1b2f3cf8a7e0631 for pr-81174
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPeronTheDuck%2Frust_Floyd_Steinberg_dithering" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PeronTheDuck/rust_Floyd_Steinberg_dithering on toolchain 9cfe725f0995b018340c519db1b2f3cf8a7e0631
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PeronTheDuck/rust_Floyd_Steinberg_dithering
[INFO] finished tweaking git repo https://github.com/PeronTheDuck/rust_Floyd_Steinberg_dithering
[INFO] tweaked toml for git repo https://github.com/PeronTheDuck/rust_Floyd_Steinberg_dithering written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/PeronTheDuck/rust_Floyd_Steinberg_dithering already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v0.15.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "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] b014faf6f4546d05d672306aabe382f3d8483678494f2270571d6ddc6ee9a8ec
[INFO] running `Command { std: "docker" "start" "-a" "b014faf6f4546d05d672306aabe382f3d8483678494f2270571d6ddc6ee9a8ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b014faf6f4546d05d672306aabe382f3d8483678494f2270571d6ddc6ee9a8ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b014faf6f4546d05d672306aabe382f3d8483678494f2270571d6ddc6ee9a8ec", kill_on_drop: false }`
[INFO] [stdout] b014faf6f4546d05d672306aabe382f3d8483678494f2270571d6ddc6ee9a8ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f085418f20f395f44b72f0d45ad48b2aa345a16114dfdacfeef11cbd129379b6
[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" "f085418f20f395f44b72f0d45ad48b2aa345a16114dfdacfeef11cbd129379b6", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]    Compiling proc-macro2 v0.4.20
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]     Checking byteorder v1.2.6
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]    Compiling num-derive v0.2.3
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]     Checking adler32 v1.0.3
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]     Checking gif v0.10.1
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking inflate v0.4.3
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]     Checking deflate v0.7.19
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.15.8
[INFO] [stderr]     Checking png v0.12.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.15
[INFO] [stderr]     Checking tiff v0.2.1
[INFO] [stderr]     Checking image v0.20.0
[INFO] [stderr]     Checking floyd_steinberg_dithering v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `rgba` should have an upper camel case name
[INFO] [stdout]  --> src/main.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 | type rgba = image::Rgba<u8>;
[INFO] [stdout]   |      ^^^^ help: convert the identifier to upper camel case: `Rgba`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let mut loss_diference: [i16; 3] = [
[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: type `rgba` should have an upper camel case name
[INFO] [stdout]  --> src/main.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 | type rgba = image::Rgba<u8>;
[INFO] [stdout]   |      ^^^^ help: convert the identifier to upper camel case: `Rgba`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let mut loss_diference: [i16; 3] = [
[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: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.66s
[INFO] running `Command { std: "docker" "inspect" "f085418f20f395f44b72f0d45ad48b2aa345a16114dfdacfeef11cbd129379b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f085418f20f395f44b72f0d45ad48b2aa345a16114dfdacfeef11cbd129379b6", kill_on_drop: false }`
[INFO] [stdout] f085418f20f395f44b72f0d45ad48b2aa345a16114dfdacfeef11cbd129379b6