[INFO] updating cached repository https://github.com/huonw/rust-resource-management
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] df59cbbd8790e2aa971af2f270b4bd4e0fe97369
[INFO] checking huonw/rust-resource-management against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuonw%2Frust-resource-management" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/huonw/rust-resource-management on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/huonw/rust-resource-management
[INFO] finished tweaking git repo https://github.com/huonw/rust-resource-management
[INFO] tweaked toml for git repo https://github.com/huonw/rust-resource-management written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/huonw/rust-resource-management already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 87a6090fef2905b4299e8b2dcb583246209b3a4ce31b843bfd75da951a992f1e
[INFO] running `"docker" "start" "-a" "87a6090fef2905b4299e8b2dcb583246209b3a4ce31b843bfd75da951a992f1e"`
[INFO] [stderr]     Checking tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `file_name`
[INFO] [stderr]   --> src/bin/resource-management.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let file_name = "data/example.csv";
[INFO] [stderr]    |         ^^^^^^^^^ help: consider prefixing with an underscore: `_file_name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]    --> src/bin/summarise-csv.rs:200:13
[INFO] [stderr]     |
[INFO] [stderr] 200 |         let row = raw_row.unwrap();
[INFO] [stderr]     |             ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/bin/summarise-csv.rs:169:23
[INFO] [stderr]     |
[INFO] [stderr] 169 |     fn add(&mut self, value: f64) {
[INFO] [stderr]     |                       ^^^^^ help: consider prefixing with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `headings_line`
[INFO] [stderr]   --> src/bin/borrowing.rs:44:31
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn split_headings_example_csv(headings_line: String) -> Vec<String> {
[INFO] [stderr]    |                               ^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_headings_line`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `heading`
[INFO] [stderr]   --> src/bin/borrowing.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |     for heading in headings_line.split(',') {
[INFO] [stderr]    |         ^^^^^^^ help: consider prefixing with an underscore: `_heading`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `headings_line`
[INFO] [stderr]   --> src/bin/borrowing.rs:44:31
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn split_headings_example_csv(headings_line: String) -> Vec<String> {
[INFO] [stderr]    |                               ^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_headings_line`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `heading`
[INFO] [stderr]   --> src/bin/borrowing.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |     for heading in headings_line.split(',') {
[INFO] [stderr]    |         ^^^^^^^ help: consider prefixing with an underscore: `_heading`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]    --> src/bin/summarise-csv.rs:200:13
[INFO] [stderr]     |
[INFO] [stderr] 200 |         let row = raw_row.unwrap();
[INFO] [stderr]     |             ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `two_by_three`
[INFO] [stderr]    --> src/bin/summarise-csv.rs:252:9
[INFO] [stderr]     |
[INFO] [stderr] 252 |     let two_by_three: &[u8] = b"2019,61\n2020,62\n2021,9999";
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_two_by_three`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/bin/summarise-csv.rs:169:23
[INFO] [stderr]     |
[INFO] [stderr] 169 |     fn add(&mut self, value: f64) {
[INFO] [stderr]     |                       ^^^^^ help: consider prefixing with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file_name`
[INFO] [stderr]   --> src/bin/resource-management.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let file_name = "data/example.csv";
[INFO] [stderr]    |         ^^^^^^^^^ help: consider prefixing with an underscore: `_file_name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.74s
[INFO] running `"docker" "inspect" "87a6090fef2905b4299e8b2dcb583246209b3a4ce31b843bfd75da951a992f1e"`
[INFO] running `"docker" "rm" "-f" "87a6090fef2905b4299e8b2dcb583246209b3a4ce31b843bfd75da951a992f1e"`
[INFO] [stdout] 87a6090fef2905b4299e8b2dcb583246209b3a4ce31b843bfd75da951a992f1e