[INFO] updating cached repository https://github.com/huonw/rust-resource-management
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/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 try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuonw%2Frust-resource-management" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/huonw/rust-resource-management on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "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 /workspace/builds/worker-1/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 `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fd7c8b5f94607366fc273e7eb67ec89d396afd00283be916f990f5c51902c3da
[INFO] running `"docker" "start" "-a" "fd7c8b5f94607366fc273e7eb67ec89d396afd00283be916f990f5c51902c3da"`
[INFO] [stderr]     Checking tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> examples/summarise-csv-5.rs:197:53
[INFO] [stderr]     |
[INFO] [stderr] 197 | fn summarise_columns(num_columns: usize, file: &mut (impl std::io::BufRead)) -> Vec<Summary> {
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> examples/summarise-csv-6.rs:197:53
[INFO] [stderr]     |
[INFO] [stderr] 197 | fn summarise_columns(num_columns: usize, file: &mut (impl std::io::BufRead)) -> Vec<Summary> {
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_value`
[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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_heading`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_heading`
[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: if this is intentional, prefix it with an underscore: `_file_name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> examples/summarise-csv-4.rs:193:53
[INFO] [stderr]     |
[INFO] [stderr] 193 | fn summarise_columns(num_columns: usize, file: &mut (impl std::io::BufRead)) -> Vec<Summary> {
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.63s
[INFO] running `"docker" "inspect" "fd7c8b5f94607366fc273e7eb67ec89d396afd00283be916f990f5c51902c3da"`
[INFO] running `"docker" "rm" "-f" "fd7c8b5f94607366fc273e7eb67ec89d396afd00283be916f990f5c51902c3da"`
[INFO] [stdout] fd7c8b5f94607366fc273e7eb67ec89d396afd00283be916f990f5c51902c3da