[INFO] cloning repository https://github.com/TimLucca/currency_arbitrage
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TimLucca/currency_arbitrage" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTimLucca%2Fcurrency_arbitrage", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTimLucca%2Fcurrency_arbitrage'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3d88311e5781ebe9142a5cf63d0522f3375509c9
[INFO] checking TimLucca/currency_arbitrage against try#1f5783cbeb5da8b38566d718631d016891e9c912 for pr-142704
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTimLucca%2Fcurrency_arbitrage" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TimLucca/currency_arbitrage on toolchain 1f5783cbeb5da8b38566d718631d016891e9c912
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f5783cbeb5da8b38566d718631d016891e9c912" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TimLucca/currency_arbitrage
[INFO] finished tweaking git repo https://github.com/TimLucca/currency_arbitrage
[INFO] tweaked toml for git repo https://github.com/TimLucca/currency_arbitrage written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/TimLucca/currency_arbitrage 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" "+1f5783cbeb5da8b38566d718631d016891e9c912" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+1f5783cbeb5da8b38566d718631d016891e9c912" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8a7ea26b701706a1e5b2ff28944b81e615d47c7f30b4726333366789dd4bc443
[INFO] running `Command { std: "docker" "start" "-a" "8a7ea26b701706a1e5b2ff28944b81e615d47c7f30b4726333366789dd4bc443", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8a7ea26b701706a1e5b2ff28944b81e615d47c7f30b4726333366789dd4bc443", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a7ea26b701706a1e5b2ff28944b81e615d47c7f30b4726333366789dd4bc443", kill_on_drop: false }`
[INFO] [stdout] 8a7ea26b701706a1e5b2ff28944b81e615d47c7f30b4726333366789dd4bc443
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+1f5783cbeb5da8b38566d718631d016891e9c912" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 02ecb13135ac54d52193bf30b03256fb67d571b4b3b6bd5722a4717adcd72314
[INFO] running `Command { std: "docker" "start" "-a" "02ecb13135ac54d52193bf30b03256fb67d571b4b3b6bd5722a4717adcd72314", kill_on_drop: false }`
[INFO] [stderr]     Checking arb v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]   --> src/main.rs:14:23
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Err(_) => (i += 1),
[INFO] [stdout]    |                       ^      ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 14 -             Err(_) => (i += 1),
[INFO] [stdout] 14 +             Err(_) => i += 1,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]   --> src/main.rs:14:23
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Err(_) => (i += 1),
[INFO] [stdout]    |                       ^      ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 14 -             Err(_) => (i += 1),
[INFO] [stdout] 14 +             Err(_) => i += 1,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/main.rs:128:22
[INFO] [stdout]     |
[INFO] [stdout] 128 |             Ok(n) => (show_best(n, graph.clone(), graph.len(), map.clone())),
[INFO] [stdout]     |                      ^                                                     ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 128 -             Ok(n) => (show_best(n, graph.clone(), graph.len(), map.clone())),
[INFO] [stdout] 128 +             Ok(n) => show_best(n, graph.clone(), graph.len(), map.clone()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/main.rs:128:22
[INFO] [stdout]     |
[INFO] [stdout] 128 |             Ok(n) => (show_best(n, graph.clone(), graph.len(), map.clone())),
[INFO] [stdout]     |                      ^                                                     ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 128 -             Ok(n) => (show_best(n, graph.clone(), graph.len(), map.clone())),
[INFO] [stdout] 128 +             Ok(n) => show_best(n, graph.clone(), graph.len(), map.clone()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] running `Command { std: "docker" "inspect" "02ecb13135ac54d52193bf30b03256fb67d571b4b3b6bd5722a4717adcd72314", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "02ecb13135ac54d52193bf30b03256fb67d571b4b3b6bd5722a4717adcd72314", kill_on_drop: false }`
[INFO] [stdout] 02ecb13135ac54d52193bf30b03256fb67d571b4b3b6bd5722a4717adcd72314