[INFO] cloning repository https://github.com/Aboussejra/rustfmt_bug
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Aboussejra/rustfmt_bug" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAboussejra%2Frustfmt_bug", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAboussejra%2Frustfmt_bug'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6b4e38d9c94a333ffa7677a80d5104d39bc7cd78
[INFO] checking Aboussejra/rustfmt_bug against master#36b21637e93b038453924d3c66821089e71d8baa for pr-143164
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAboussejra%2Frustfmt_bug" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Aboussejra/rustfmt_bug
[INFO] finished tweaking git repo https://github.com/Aboussejra/rustfmt_bug
[INFO] tweaked toml for git repo https://github.com/Aboussejra/rustfmt_bug written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Aboussejra/rustfmt_bug on toolchain 36b21637e93b038453924d3c66821089e71d8baa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Aboussejra/rustfmt_bug 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" "+36b21637e93b038453924d3c66821089e71d8baa" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1d86f9b913272193a9272a4fc1df3229f8385558d92fab4311b350c9d4f8853f
[INFO] running `Command { std: "docker" "start" "-a" "1d86f9b913272193a9272a4fc1df3229f8385558d92fab4311b350c9d4f8853f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d86f9b913272193a9272a4fc1df3229f8385558d92fab4311b350c9d4f8853f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d86f9b913272193a9272a4fc1df3229f8385558d92fab4311b350c9d4f8853f", kill_on_drop: false }`
[INFO] [stdout] 1d86f9b913272193a9272a4fc1df3229f8385558d92fab4311b350c9d4f8853f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ba8f3f5c05febfc03bf25da4e866a32dcf9259fefd0ff0cdfd8f1c52406de07b
[INFO] running `Command { std: "docker" "start" "-a" "ba8f3f5c05febfc03bf25da4e866a32dcf9259fefd0ff0cdfd8f1c52406de07b", kill_on_drop: false }`
[INFO] [stderr]     Checking rustfmt_bug v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Map` that must be used
[INFO] [stdout]  --> src/main.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | /         vector_of_vectors.iter().map(|vector_of_number|
[INFO] [stdout] 4 | |             {
[INFO] [stdout] 5 | |             let bar = vector_of_number.iter().find(|number|
[INFO] [stdout] 6 | |             number == &&1).expect("this is a long message, which makes rustfmt fails if long enough");
[INFO] [stdout] 7 | |             bar});
[INFO] [stdout]   | |_________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 3 |         let _ = vector_of_vectors.iter().map(|vector_of_number|
[INFO] [stdout]   |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Map` that must be used
[INFO] [stdout]  --> src/main.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | /         vector_of_vectors.iter().map(|vector_of_number|
[INFO] [stdout] 4 | |             {
[INFO] [stdout] 5 | |             let bar = vector_of_number.iter().find(|number|
[INFO] [stdout] 6 | |             number == &&1).expect("this is a long message, which makes rustfmt fails if long enough");
[INFO] [stdout] 7 | |             bar});
[INFO] [stdout]   | |_________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 3 |         let _ = vector_of_vectors.iter().map(|vector_of_number|
[INFO] [stdout]   |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "ba8f3f5c05febfc03bf25da4e866a32dcf9259fefd0ff0cdfd8f1c52406de07b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba8f3f5c05febfc03bf25da4e866a32dcf9259fefd0ff0cdfd8f1c52406de07b", kill_on_drop: false }`
[INFO] [stdout] ba8f3f5c05febfc03bf25da4e866a32dcf9259fefd0ff0cdfd8f1c52406de07b
