[INFO] cloning repository https://github.com/PixelRenderingDiploma/PixelRendererImageHelper
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PixelRenderingDiploma/PixelRendererImageHelper" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPixelRenderingDiploma%2FPixelRendererImageHelper", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPixelRenderingDiploma%2FPixelRendererImageHelper'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1742ccf4556ef3f8f9573bf9b42ceab772df7c32
[INFO] checking PixelRenderingDiploma/PixelRendererImageHelper against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPixelRenderingDiploma%2FPixelRendererImageHelper" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/PixelRenderingDiploma/PixelRendererImageHelper
[INFO] finished tweaking git repo https://github.com/PixelRenderingDiploma/PixelRendererImageHelper
[INFO] tweaked toml for git repo https://github.com/PixelRenderingDiploma/PixelRendererImageHelper written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/PixelRenderingDiploma/PixelRendererImageHelper on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/PixelRenderingDiploma/PixelRendererImageHelper 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 77f5386d1fa813f0233727f789a75f5933614b65bbb424ae2c31e9ea59ae7bab
[INFO] running `Command { std: "docker" "start" "-a" "77f5386d1fa813f0233727f789a75f5933614b65bbb424ae2c31e9ea59ae7bab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77f5386d1fa813f0233727f789a75f5933614b65bbb424ae2c31e9ea59ae7bab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77f5386d1fa813f0233727f789a75f5933614b65bbb424ae2c31e9ea59ae7bab", kill_on_drop: false }`
[INFO] [stdout] 77f5386d1fa813f0233727f789a75f5933614b65bbb424ae2c31e9ea59ae7bab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2be741f49c9ae6d7b9a6a8bf8706ca3da2b6b288b912cafed4c50b6f1b41a982
[INFO] running `Command { std: "docker" "start" "-a" "2be741f49c9ae6d7b9a6a8bf8706ca3da2b6b288b912cafed4c50b6f1b41a982", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc32fast v1.4.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking crc-catalog v2.4.0
[INFO] [stderr]     Checking crc v3.2.1
[INFO] [stderr]     Checking miniz_oxide v0.7.2
[INFO] [stderr]     Checking flate2 v1.0.30
[INFO] [stderr]     Checking pixel_renderer_image_helper v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: struct `PLTE` is never constructed
[INFO] [stdout]  --> src/png/plte.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct PLTE {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]   = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `colors` is never read
[INFO] [stdout]  --> src/png/plte.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct PLTE {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 4 |     colors: Vec<Color>,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `read_to_string_exact` is never used
[INFO] [stdout]  --> src/read_to_string_exact.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait ReadToStringExact: io::Read {
[INFO] [stdout]   |           ----------------- method in this trait
[INFO] [stdout] 6 |     #[inline]
[INFO] [stdout] 7 |     fn read_to_string_exact(&mut self, size: usize) -> io::Result<String> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `PLTE` is never constructed
[INFO] [stdout]  --> src/png/plte.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct PLTE {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]   = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `colors` is never read
[INFO] [stdout]  --> src/png/plte.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct PLTE {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 4 |     colors: Vec<Color>,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `read_to_string_exact` is never used
[INFO] [stdout]  --> src/read_to_string_exact.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait ReadToStringExact: io::Read {
[INFO] [stdout]   |           ----------------- method in this trait
[INFO] [stdout] 6 |     #[inline]
[INFO] [stdout] 7 |     fn read_to_string_exact(&mut self, size: usize) -> io::Result<String> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pixel_renderer_image_helper` (lib test) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `pixel_renderer_image_helper` (lib) due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "2be741f49c9ae6d7b9a6a8bf8706ca3da2b6b288b912cafed4c50b6f1b41a982", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2be741f49c9ae6d7b9a6a8bf8706ca3da2b6b288b912cafed4c50b6f1b41a982", kill_on_drop: false }`
[INFO] [stdout] 2be741f49c9ae6d7b9a6a8bf8706ca3da2b6b288b912cafed4c50b6f1b41a982