[INFO] cloning repository https://github.com/kereteka/rust-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kereteka/rust-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkereteka%2Frust-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkereteka%2Frust-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a63ec8ceb09bad9d51482e4baa657e50c030cdee
[INFO] checking kereteka/rust-exercises against master#4ecd70ddd1039a3954056c1071e40278048476fa for pr-137633
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkereteka%2Frust-exercises" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kereteka/rust-exercises on toolchain 4ecd70ddd1039a3954056c1071e40278048476fa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4ecd70ddd1039a3954056c1071e40278048476fa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kereteka/rust-exercises
[INFO] finished tweaking git repo https://github.com/kereteka/rust-exercises
[INFO] tweaked toml for git repo https://github.com/kereteka/rust-exercises written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kereteka/rust-exercises 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" "+4ecd70ddd1039a3954056c1071e40278048476fa" "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-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+4ecd70ddd1039a3954056c1071e40278048476fa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2edab9640da9c4c753ad49c352c92b38d3eb27669a188217f82eefacc205a308
[INFO] running `Command { std: "docker" "start" "-a" "2edab9640da9c4c753ad49c352c92b38d3eb27669a188217f82eefacc205a308", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2edab9640da9c4c753ad49c352c92b38d3eb27669a188217f82eefacc205a308", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2edab9640da9c4c753ad49c352c92b38d3eb27669a188217f82eefacc205a308", kill_on_drop: false }`
[INFO] [stdout] 2edab9640da9c4c753ad49c352c92b38d3eb27669a188217f82eefacc205a308
[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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+4ecd70ddd1039a3954056c1071e40278048476fa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2f42324d44bf6a5204670f2860252b7563ffb7afa9f2a694ddc7821ffd7dff57
[INFO] running `Command { std: "docker" "start" "-a" "2f42324d44bf6a5204670f2860252b7563ffb7afa9f2a694ddc7821ffd7dff57", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-assignment-1 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/main.rs:42:75
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let publication = vec![Publication::Book(book), Publication::Magazine((magazine))];
[INFO] [stdout]    |                                                                           ^        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 42 -     let publication = vec![Publication::Book(book), Publication::Magazine((magazine))];
[INFO] [stdout] 42 +     let publication = vec![Publication::Book(book), Publication::Magazine(magazine)];
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/main.rs:42:75
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let publication = vec![Publication::Book(book), Publication::Magazine((magazine))];
[INFO] [stdout]    |                                                                           ^        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 42 -     let publication = vec![Publication::Book(book), Publication::Magazine((magazine))];
[INFO] [stdout] 42 +     let publication = vec![Publication::Book(book), Publication::Magazine(magazine)];
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "2f42324d44bf6a5204670f2860252b7563ffb7afa9f2a694ddc7821ffd7dff57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f42324d44bf6a5204670f2860252b7563ffb7afa9f2a694ddc7821ffd7dff57", kill_on_drop: false }`
[INFO] [stdout] 2f42324d44bf6a5204670f2860252b7563ffb7afa9f2a694ddc7821ffd7dff57