[INFO] cloning repository https://github.com/wesley-lewis/SimpleMining
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wesley-lewis/SimpleMining" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwesley-lewis%2FSimpleMining", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwesley-lewis%2FSimpleMining'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a44e77c080c18077911a97eb2cd6fc653fd828ab
[INFO] building wesley-lewis/SimpleMining against master#f77247ac59b29ce927f4d2cd1c26a4b2d1d358c9 for pr-137044-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwesley-lewis%2FSimpleMining" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wesley-lewis/SimpleMining on toolchain f77247ac59b29ce927f4d2cd1c26a4b2d1d358c9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f77247ac59b29ce927f4d2cd1c26a4b2d1d358c9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wesley-lewis/SimpleMining
[INFO] finished tweaking git repo https://github.com/wesley-lewis/SimpleMining
[INFO] tweaked toml for git repo https://github.com/wesley-lewis/SimpleMining written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/wesley-lewis/SimpleMining 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" "+f77247ac59b29ce927f4d2cd1c26a4b2d1d358c9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded typenum v1.16.0
[INFO] [stderr]   Downloaded version_check v0.9.4
[INFO] [stderr]   Downloaded block-buffer v0.10.4
[INFO] [stderr]   Downloaded generic-array v0.14.7
[INFO] [stderr]   Downloaded sha256 v1.1.3
[INFO] [stderr]   Downloaded digest v0.10.7
[INFO] [stderr]   Downloaded cfg-if v1.0.0
[INFO] [stderr]   Downloaded hex v0.4.3
[INFO] [stderr]   Downloaded cpufeatures v0.2.7
[INFO] [stderr]   Downloaded crypto-common v0.1.6
[INFO] [stderr]   Downloaded sha2 v0.10.6
[INFO] [stderr]   Downloaded libc v0.2.144
[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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+f77247ac59b29ce927f4d2cd1c26a4b2d1d358c9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 33eaee1065c50b3022376a8fa7899edc51ad273d43f6677ecaedbbe584a55b79
[INFO] running `Command { std: "docker" "start" "-a" "33eaee1065c50b3022376a8fa7899edc51ad273d43f6677ecaedbbe584a55b79", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33eaee1065c50b3022376a8fa7899edc51ad273d43f6677ecaedbbe584a55b79", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33eaee1065c50b3022376a8fa7899edc51ad273d43f6677ecaedbbe584a55b79", kill_on_drop: false }`
[INFO] [stdout] 33eaee1065c50b3022376a8fa7899edc51ad273d43f6677ecaedbbe584a55b79
[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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+f77247ac59b29ce927f4d2cd1c26a4b2d1d358c9" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 046d9a1f8c6d3e30e80307811f76416e717ba9209202eb8f0d3db5d5ce9eaad1
[INFO] running `Command { std: "docker" "start" "-a" "046d9a1f8c6d3e30e80307811f76416e717ba9209202eb8f0d3db5d5ce9eaad1", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling cpufeatures v0.2.7
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling hex v0.4.3
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling sha2 v0.10.6
[INFO] [stderr]    Compiling sha256 v1.1.3
[INFO] [stderr]    Compiling mining v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `first_four_char`
[INFO] [stdout]  --> src/main.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut first_four_char: &str;
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_four_char`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.54s
[INFO] running `Command { std: "docker" "inspect" "046d9a1f8c6d3e30e80307811f76416e717ba9209202eb8f0d3db5d5ce9eaad1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "046d9a1f8c6d3e30e80307811f76416e717ba9209202eb8f0d3db5d5ce9eaad1", kill_on_drop: false }`
[INFO] [stdout] 046d9a1f8c6d3e30e80307811f76416e717ba9209202eb8f0d3db5d5ce9eaad1
[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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+f77247ac59b29ce927f4d2cd1c26a4b2d1d358c9" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c85d9dcb780f19d899e4b9867d1c228833938c5e7be9cd381a90de1918588140
[INFO] running `Command { std: "docker" "start" "-a" "c85d9dcb780f19d899e4b9867d1c228833938c5e7be9cd381a90de1918588140", kill_on_drop: false }`
[INFO] [stderr]    Compiling mining v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `first_four_char`
[INFO] [stdout]  --> src/main.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut first_four_char: &str;
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_four_char`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "c85d9dcb780f19d899e4b9867d1c228833938c5e7be9cd381a90de1918588140", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c85d9dcb780f19d899e4b9867d1c228833938c5e7be9cd381a90de1918588140", kill_on_drop: false }`
[INFO] [stdout] c85d9dcb780f19d899e4b9867d1c228833938c5e7be9cd381a90de1918588140