[INFO] cloning repository https://github.com/shadowbiz/image-differer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shadowbiz/image-differer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshadowbiz%2Fimage-differer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshadowbiz%2Fimage-differer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cefe689328fce7d6c4e0dd8a1da60212f13f841b
[INFO] building shadowbiz/image-differer against master#44f415c1d617ebc7b931a243b7b321ef8a6ca47c for pr-142134-abi-ast-error
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshadowbiz%2Fimage-differer" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shadowbiz/image-differer on toolchain 44f415c1d617ebc7b931a243b7b321ef8a6ca47c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shadowbiz/image-differer
[INFO] finished tweaking git repo https://github.com/shadowbiz/image-differer
[INFO] tweaked toml for git repo https://github.com/shadowbiz/image-differer written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/shadowbiz/image-differer 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" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a745de42b7438821b8ef10e884063e843b27264a361dfa518e091944dd0648ef
[INFO] running `Command { std: "docker" "start" "-a" "a745de42b7438821b8ef10e884063e843b27264a361dfa518e091944dd0648ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a745de42b7438821b8ef10e884063e843b27264a361dfa518e091944dd0648ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a745de42b7438821b8ef10e884063e843b27264a361dfa518e091944dd0648ef", kill_on_drop: false }`
[INFO] [stdout] a745de42b7438821b8ef10e884063e843b27264a361dfa518e091944dd0648ef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a38dc2bca5613e13f7052ef23eacd7acc42bbbc76a69a16fa2f08377facbf18b
[INFO] running `Command { std: "docker" "start" "-a" "a38dc2bca5613e13f7052ef23eacd7acc42bbbc76a69a16fa2f08377facbf18b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling deflate v1.0.0
[INFO] [stderr]    Compiling miniz_oxide v0.5.3
[INFO] [stderr]    Compiling getrandom v0.2.7
[INFO] [stderr]    Compiling png v0.17.5
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling differer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/main.rs:36:39
[INFO] [stdout]    |
[INFO] [stdout] 36 |             Pixel::RGBA_U8 { r, g, b, a } => {
[INFO] [stdout]    |                                       ^ help: try ignoring the field: `a: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_pixel_rgba_u8` is never used
[INFO] [stdout]   --> src/main.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Pixel {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] 13 |     pub fn to_pixel_rgba_u8(&self) -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> src/main.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct Image {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 52 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 53 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.01s
[INFO] running `Command { std: "docker" "inspect" "a38dc2bca5613e13f7052ef23eacd7acc42bbbc76a69a16fa2f08377facbf18b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a38dc2bca5613e13f7052ef23eacd7acc42bbbc76a69a16fa2f08377facbf18b", kill_on_drop: false }`
[INFO] [stdout] a38dc2bca5613e13f7052ef23eacd7acc42bbbc76a69a16fa2f08377facbf18b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0530d4f8342ff82db0278f3eb0905b277e92910d670b3b12607524abc9fe9d47
[INFO] running `Command { std: "docker" "start" "-a" "0530d4f8342ff82db0278f3eb0905b277e92910d670b3b12607524abc9fe9d47", kill_on_drop: false }`
[INFO] [stderr]    Compiling differer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/main.rs:36:39
[INFO] [stdout]    |
[INFO] [stdout] 36 |             Pixel::RGBA_U8 { r, g, b, a } => {
[INFO] [stdout]    |                                       ^ help: try ignoring the field: `a: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_pixel_rgba_u8` is never used
[INFO] [stdout]   --> src/main.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Pixel {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] 13 |     pub fn to_pixel_rgba_u8(&self) -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> src/main.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct Image {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 52 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 53 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "0530d4f8342ff82db0278f3eb0905b277e92910d670b3b12607524abc9fe9d47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0530d4f8342ff82db0278f3eb0905b277e92910d670b3b12607524abc9fe9d47", kill_on_drop: false }`
[INFO] [stdout] 0530d4f8342ff82db0278f3eb0905b277e92910d670b3b12607524abc9fe9d47