[INFO] cloning repository https://github.com/k-kuroguro/rust-electric-potential-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/k-kuroguro/rust-electric-potential-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk-kuroguro%2Frust-electric-potential-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk-kuroguro%2Frust-electric-potential-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aede581115b9185361d8ae28f04140cddd6526a2
[INFO] checking k-kuroguro/rust-electric-potential-solver against master#f7b43542838f0a4a6cfdb17fbeadf45002042a77 for pr-138499
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk-kuroguro%2Frust-electric-potential-solver" "/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/k-kuroguro/rust-electric-potential-solver on toolchain f7b43542838f0a4a6cfdb17fbeadf45002042a77
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f7b43542838f0a4a6cfdb17fbeadf45002042a77" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/k-kuroguro/rust-electric-potential-solver
[INFO] finished tweaking git repo https://github.com/k-kuroguro/rust-electric-potential-solver
[INFO] tweaked toml for git repo https://github.com/k-kuroguro/rust-electric-potential-solver written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/k-kuroguro/rust-electric-potential-solver 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" "+f7b43542838f0a4a6cfdb17fbeadf45002042a77" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+f7b43542838f0a4a6cfdb17fbeadf45002042a77" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4e62c4e81620865b327683a668763f083e2b259c063607d6771b181b8287915b
[INFO] running `Command { std: "docker" "start" "-a" "4e62c4e81620865b327683a668763f083e2b259c063607d6771b181b8287915b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e62c4e81620865b327683a668763f083e2b259c063607d6771b181b8287915b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e62c4e81620865b327683a668763f083e2b259c063607d6771b181b8287915b", kill_on_drop: false }`
[INFO] [stdout] 4e62c4e81620865b327683a668763f083e2b259c063607d6771b181b8287915b
[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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+f7b43542838f0a4a6cfdb17fbeadf45002042a77" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 65eb41a9973ab7c83de75017b12411c1020a0b5adbe6e5d1086beed80e7f91f4
[INFO] running `Command { std: "docker" "start" "-a" "65eb41a9973ab7c83de75017b12411c1020a0b5adbe6e5d1086beed80e7f91f4", kill_on_drop: false }`
[INFO] [stderr]     Checking electric-potential-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `is_boundary` is never used
[INFO] [stdout]    --> src/solver.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 18  | impl Solver {
[INFO] [stdout]     | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 197 |    fn is_boundary(&self, i: usize, j: usize) -> bool {
[INFO] [stdout]     |       ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/solver.rs:92:7
[INFO] [stdout]    |
[INFO] [stdout] 92 |       drop(solver);
[INFO] [stdout]    |       ^^^^^------^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            argument has type `&Solver`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 92 -       drop(solver);
[INFO] [stdout] 92 +       let _ = solver;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_boundary` is never used
[INFO] [stdout]    --> src/solver.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 18  | impl Solver {
[INFO] [stdout]     | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 197 |    fn is_boundary(&self, i: usize, j: usize) -> bool {
[INFO] [stdout]     |       ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/solver.rs:92:7
[INFO] [stdout]    |
[INFO] [stdout] 92 |       drop(solver);
[INFO] [stdout]    |       ^^^^^------^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            argument has type `&Solver`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 92 -       drop(solver);
[INFO] [stdout] 92 +       let _ = solver;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "65eb41a9973ab7c83de75017b12411c1020a0b5adbe6e5d1086beed80e7f91f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65eb41a9973ab7c83de75017b12411c1020a0b5adbe6e5d1086beed80e7f91f4", kill_on_drop: false }`
[INFO] [stdout] 65eb41a9973ab7c83de75017b12411c1020a0b5adbe6e5d1086beed80e7f91f4