[INFO] cloning repository https://github.com/edwardvear/mnist
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/edwardvear/mnist" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedwardvear%2Fmnist", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedwardvear%2Fmnist'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 81c4cfa103fdb1ecce82668b306ed35530893f94
[INFO] checking edwardvear/mnist against master#377656d3dd3f9c23a9c8713e163f4365a5261a84 for pr-146470-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedwardvear%2Fmnist" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/edwardvear/mnist
[INFO] finished tweaking git repo https://github.com/edwardvear/mnist
[INFO] tweaked toml for git repo https://github.com/edwardvear/mnist written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/edwardvear/mnist on toolchain 377656d3dd3f9c23a9c8713e163f4365a5261a84
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+377656d3dd3f9c23a9c8713e163f4365a5261a84" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/edwardvear/mnist 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" "+377656d3dd3f9c23a9c8713e163f4365a5261a84" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+377656d3dd3f9c23a9c8713e163f4365a5261a84" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0b06e64da02bdf75063e6120a615240f6776935e14db9833f3233569c77130dc
[INFO] running `Command { std: "docker" "start" "-a" "0b06e64da02bdf75063e6120a615240f6776935e14db9833f3233569c77130dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b06e64da02bdf75063e6120a615240f6776935e14db9833f3233569c77130dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b06e64da02bdf75063e6120a615240f6776935e14db9833f3233569c77130dc", kill_on_drop: false }`
[INFO] [stdout] 0b06e64da02bdf75063e6120a615240f6776935e14db9833f3233569c77130dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+377656d3dd3f9c23a9c8713e163f4365a5261a84" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0e1359ceb410a28e5493c78ef1ae68e66c752f21a4b32f20ba325a1d2910333e
[INFO] running `Command { std: "docker" "start" "-a" "0e1359ceb410a28e5493c78ef1ae68e66c752f21a4b32f20ba325a1d2910333e", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]    Compiling libc v0.2.175
[INFO] [stderr]     Checking imgref v1.11.0
[INFO] [stderr]     Checking loop9 v0.1.5
[INFO] [stderr]     Checking nom v7.1.3
[INFO] [stderr]     Checking getrandom v0.3.3
[INFO] [stderr]     Checking rand_core v0.9.3
[INFO] [stderr]     Checking rand_chacha v0.9.0
[INFO] [stderr]     Checking rand v0.9.2
[INFO] [stderr]     Checking av1-grain v0.2.4
[INFO] [stderr]     Checking rav1e v0.7.1
[INFO] [stderr]     Checking ravif v0.11.20
[INFO] [stderr]     Checking image v0.25.8
[INFO] [stderr]     Checking mnist v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `Layer` is more private than the item `Network::layers`
[INFO] [stdout]    --> src/network.rs:9:5
[INFO] [stdout]     |
[INFO] [stdout]   9 |     pub layers: Vec<Layer>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^ field `Network::layers` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `Layer` is only usable at visibility `pub(self)`
[INFO] [stdout]    --> src/network.rs:149:1
[INFO] [stdout]     |
[INFO] [stdout] 149 | struct Layer {
[INFO] [stdout]     | ^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_layers` is never used
[INFO] [stdout]   --> src/network.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Network {
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 26 |     fn from_layers(layers: Vec<Layer>) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UnityActivation` is never constructed
[INFO] [stdout]    --> src/network.rs:127:8
[INFO] [stdout]     |
[INFO] [stdout] 127 | struct UnityActivation;
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `network::Layer` is more private than the item `network::Network::layers`
[INFO] [stdout]    --> src/network.rs:9:5
[INFO] [stdout]     |
[INFO] [stdout]   9 |     pub layers: Vec<Layer>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^ field `network::Network::layers` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `network::Layer` is only usable at visibility `pub(self)`
[INFO] [stdout]    --> src/network.rs:149:1
[INFO] [stdout]     |
[INFO] [stdout] 149 | struct Layer {
[INFO] [stdout]     | ^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/view_image.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     im.save("test.png");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let _ = im.save("test.png");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/view_image.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     im.save("test.png");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let _ = im.save("test.png");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.74s
[INFO] running `Command { std: "docker" "inspect" "0e1359ceb410a28e5493c78ef1ae68e66c752f21a4b32f20ba325a1d2910333e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e1359ceb410a28e5493c78ef1ae68e66c752f21a4b32f20ba325a1d2910333e", kill_on_drop: false }`
[INFO] [stdout] 0e1359ceb410a28e5493c78ef1ae68e66c752f21a4b32f20ba325a1d2910333e