[INFO] cloning repository https://github.com/rklaehn/impl-visibility
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rklaehn/impl-visibility" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frklaehn%2Fimpl-visibility", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frklaehn%2Fimpl-visibility'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5a0efbaaadf0a4f350bf72509e8836e2488ddd4a
[INFO] checking rklaehn/impl-visibility against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frklaehn%2Fimpl-visibility" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rklaehn/impl-visibility on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rklaehn/impl-visibility
[INFO] finished tweaking git repo https://github.com/rklaehn/impl-visibility
[INFO] tweaked toml for git repo https://github.com/rklaehn/impl-visibility written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rklaehn/impl-visibility 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4ac66d0b7527d502774eb8fff98e2fc07d726f60c57f6ce2eef88aa4fcaa345e
[INFO] running `Command { std: "docker" "start" "-a" "4ac66d0b7527d502774eb8fff98e2fc07d726f60c57f6ce2eef88aa4fcaa345e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ac66d0b7527d502774eb8fff98e2fc07d726f60c57f6ce2eef88aa4fcaa345e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ac66d0b7527d502774eb8fff98e2fc07d726f60c57f6ce2eef88aa4fcaa345e", kill_on_drop: false }`
[INFO] [stdout] 4ac66d0b7527d502774eb8fff98e2fc07d726f60c57f6ce2eef88aa4fcaa345e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef0ce742029446b6484a4f98c801847cad8c13b7432b00abb702d0ebc36782d8
[INFO] running `Command { std: "docker" "start" "-a" "ef0ce742029446b6484a4f98c801847cad8c13b7432b00abb702d0ebc36782d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]     Checking unicode-ident v1.0.4
[INFO] [stderr]     Checking impl-visibility v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Foo` is never constructed
[INFO] [stdout]  --> examples/test.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Foo;
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Bar` is never used
[INFO] [stdout]  --> examples/test.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | trait Bar {
[INFO] [stdout]   |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `test` and `SIZE` are never used
[INFO] [stdout]   --> examples/test.rs:9:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl Foo {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] 9  |     fn test() {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 10 |
[INFO] [stdout] 11 |     const SIZE: usize = 1;
[INFO] [stdout]    |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.30s
[INFO] running `Command { std: "docker" "inspect" "ef0ce742029446b6484a4f98c801847cad8c13b7432b00abb702d0ebc36782d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef0ce742029446b6484a4f98c801847cad8c13b7432b00abb702d0ebc36782d8", kill_on_drop: false }`
[INFO] [stdout] ef0ce742029446b6484a4f98c801847cad8c13b7432b00abb702d0ebc36782d8