[INFO] cloning repository https://github.com/DeusFerrariis/rust-patterns
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DeusFerrariis/rust-patterns" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDeusFerrariis%2Frust-patterns", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDeusFerrariis%2Frust-patterns'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7d8b0239631461ae61a79e92d5b0233fb7dbfab2
[INFO] checking DeusFerrariis/rust-patterns against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDeusFerrariis%2Frust-patterns" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DeusFerrariis/rust-patterns on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DeusFerrariis/rust-patterns
[INFO] finished tweaking git repo https://github.com/DeusFerrariis/rust-patterns
[INFO] tweaked toml for git repo https://github.com/DeusFerrariis/rust-patterns written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/DeusFerrariis/rust-patterns already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a8af1d14cca8c478c3fbae71adaa25760896f66d0ad48161e0b93b588afe9ad5
[INFO] running `Command { std: "docker" "start" "-a" "a8af1d14cca8c478c3fbae71adaa25760896f66d0ad48161e0b93b588afe9ad5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8af1d14cca8c478c3fbae71adaa25760896f66d0ad48161e0b93b588afe9ad5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8af1d14cca8c478c3fbae71adaa25760896f66d0ad48161e0b93b588afe9ad5", kill_on_drop: false }`
[INFO] [stdout] a8af1d14cca8c478c3fbae71adaa25760896f66d0ad48161e0b93b588afe9ad5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4a8f481bbb361437a6477cfc65b5a576dbec436acf167b248c18582023413dbf
[INFO] running `Command { std: "docker" "start" "-a" "4a8f481bbb361437a6477cfc65b5a576dbec436acf167b248c18582023413dbf", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rust-patterns v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]  --> src/singleton.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     V4,
[INFO] [stdout]   |     ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/singleton.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     V6,
[INFO] [stdout]   |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Singleton`
[INFO] [stdout]   --> src/singleton.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Singleton {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `take_instance`
[INFO] [stdout]   --> src/singleton.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn take_instance(&mut self) -> IpAddr {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `SINGLETON`
[INFO] [stdout]   --> src/singleton.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | / static mut SINGLETON: Singleton = Singleton {
[INFO] [stdout] 22 | |     field: Some(IpAddr::V4),
[INFO] [stdout] 23 | | };
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `singleton_num2`
[INFO] [stdout]   --> src/singleton.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let singleton_num2 = unsafe { SINGLETON.take_instance() };
[INFO] [stdout]    |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_singleton_num2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/singleton.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     V6,
[INFO] [stdout]   |     ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` 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 1.92s
[INFO] running `Command { std: "docker" "inspect" "4a8f481bbb361437a6477cfc65b5a576dbec436acf167b248c18582023413dbf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a8f481bbb361437a6477cfc65b5a576dbec436acf167b248c18582023413dbf", kill_on_drop: false }`
[INFO] [stdout] 4a8f481bbb361437a6477cfc65b5a576dbec436acf167b248c18582023413dbf