[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 try#9a3ef2cd3ecaae3c6ef59768612837d797602a6d for pr-137044-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwesley-lewis%2FSimpleMining" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wesley-lewis/SimpleMining on toolchain 9a3ef2cd3ecaae3c6ef59768612837d797602a6d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9a3ef2cd3ecaae3c6ef59768612837d797602a6d" "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-5-tc2/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" "+9a3ef2cd3ecaae3c6ef59768612837d797602a6d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+9a3ef2cd3ecaae3c6ef59768612837d797602a6d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71c20765d825289bf1d9dbf0c61805d928ed68673d3a9e4e7e03757ddb70884d
[INFO] running `Command { std: "docker" "start" "-a" "71c20765d825289bf1d9dbf0c61805d928ed68673d3a9e4e7e03757ddb70884d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71c20765d825289bf1d9dbf0c61805d928ed68673d3a9e4e7e03757ddb70884d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71c20765d825289bf1d9dbf0c61805d928ed68673d3a9e4e7e03757ddb70884d", kill_on_drop: false }`
[INFO] [stdout] 71c20765d825289bf1d9dbf0c61805d928ed68673d3a9e4e7e03757ddb70884d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+9a3ef2cd3ecaae3c6ef59768612837d797602a6d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b273174923785b939c220eee18008aac86bba2497378b2f289880e220542255d
[INFO] running `Command { std: "docker" "start" "-a" "b273174923785b939c220eee18008aac86bba2497378b2f289880e220542255d", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling cpufeatures v0.2.7
[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 1.78s
[INFO] running `Command { std: "docker" "inspect" "b273174923785b939c220eee18008aac86bba2497378b2f289880e220542255d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b273174923785b939c220eee18008aac86bba2497378b2f289880e220542255d", kill_on_drop: false }`
[INFO] [stdout] b273174923785b939c220eee18008aac86bba2497378b2f289880e220542255d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+9a3ef2cd3ecaae3c6ef59768612837d797602a6d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e7d9380a872c815ccae003f498aacdae2abe3fbfc82b062b8b75635fcf41d9d7
[INFO] running `Command { std: "docker" "start" "-a" "e7d9380a872c815ccae003f498aacdae2abe3fbfc82b062b8b75635fcf41d9d7", 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 0.11s
[INFO] running `Command { std: "docker" "inspect" "e7d9380a872c815ccae003f498aacdae2abe3fbfc82b062b8b75635fcf41d9d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7d9380a872c815ccae003f498aacdae2abe3fbfc82b062b8b75635fcf41d9d7", kill_on_drop: false }`
[INFO] [stdout] e7d9380a872c815ccae003f498aacdae2abe3fbfc82b062b8b75635fcf41d9d7