[INFO] cloning repository https://github.com/icheered/SudokuSolver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/icheered/SudokuSolver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ficheered%2FSudokuSolver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ficheered%2FSudokuSolver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6cae2aaa84c15ad7dfa2205908feed299d85da41
[INFO] checking icheered/SudokuSolver against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ficheered%2FSudokuSolver" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/icheered/SudokuSolver on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/icheered/SudokuSolver
[INFO] finished tweaking git repo https://github.com/icheered/SudokuSolver
[INFO] tweaked toml for git repo https://github.com/icheered/SudokuSolver written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/icheered/SudokuSolver 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tracing-error v0.2.0
[INFO] [stderr]   Downloaded eyre v0.6.9
[INFO] [stderr]   Downloaded owo-colors v3.5.0
[INFO] [stderr]   Downloaded color-spantrace v0.2.1
[INFO] [stderr]   Downloaded color-eyre v0.6.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6f2cd400674f2e7b5cdab3792acb0d441920b3be6e7f7efc53316e049a320557
[INFO] running `Command { std: "docker" "start" "-a" "6f2cd400674f2e7b5cdab3792acb0d441920b3be6e7f7efc53316e049a320557", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6f2cd400674f2e7b5cdab3792acb0d441920b3be6e7f7efc53316e049a320557", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f2cd400674f2e7b5cdab3792acb0d441920b3be6e7f7efc53316e049a320557", kill_on_drop: false }`
[INFO] [stdout] 6f2cd400674f2e7b5cdab3792acb0d441920b3be6e7f7efc53316e049a320557
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b3dbc94247ed5fc7602a2ac5b017ced74cc72b86ff1e452c95a9120b1bc06807
[INFO] running `Command { std: "docker" "start" "-a" "b3dbc94247ed5fc7602a2ac5b017ced74cc72b86ff1e452c95a9120b1bc06807", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]     Checking sharded-slab v0.1.7
[INFO] [stderr]     Checking thread_local v1.1.7
[INFO] [stderr]    Compiling eyre v0.6.9
[INFO] [stderr]    Compiling serde v1.0.193
[INFO] [stderr]     Checking gimli v0.28.1
[INFO] [stderr]     Checking owo-colors v3.5.0
[INFO] [stderr]     Checking console v0.15.7
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]    Compiling syn v2.0.41
[INFO] [stderr]     Checking object v0.32.1
[INFO] [stderr]     Checking tracing-subscriber v0.3.18
[INFO] [stderr]     Checking csv-core v0.1.11
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]     Checking indicatif v0.17.7
[INFO] [stderr]     Checking tracing-error v0.2.0
[INFO] [stderr]     Checking color-spantrace v0.2.1
[INFO] [stderr]    Compiling backtrace v0.3.69
[INFO] [stderr]     Checking addr2line v0.21.0
[INFO] [stderr]    Compiling serde_derive v1.0.193
[INFO] [stderr]     Checking csv v1.3.0
[INFO] [stderr]     Checking color-eyre v0.6.2
[INFO] [stderr]     Checking sudoku_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `csv` is imported redundantly
[INFO] [stdout]  --> src/utility.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use csv;
[INFO] [stdout]   |     ^^^ the item `csv` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `csv` is imported redundantly
[INFO] [stdout]  --> src/utility.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use csv;
[INFO] [stdout]   |     ^^^ the item `csv` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id`, `clues`, and `difficulty` are never read
[INFO] [stdout]   --> src/utility.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Record {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 21 |     pub id: i64,
[INFO] [stdout]    |         ^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub clues: i8,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 25 |     pub difficulty: f64,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Record` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id`, `clues`, and `difficulty` are never read
[INFO] [stdout]   --> src/utility.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Record {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 21 |     pub id: i64,
[INFO] [stdout]    |         ^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub clues: i8,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 25 |     pub difficulty: f64,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Record` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 23.61s
[INFO] running `Command { std: "docker" "inspect" "b3dbc94247ed5fc7602a2ac5b017ced74cc72b86ff1e452c95a9120b1bc06807", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3dbc94247ed5fc7602a2ac5b017ced74cc72b86ff1e452c95a9120b1bc06807", kill_on_drop: false }`
[INFO] [stdout] b3dbc94247ed5fc7602a2ac5b017ced74cc72b86ff1e452c95a9120b1bc06807