[INFO] updating cached repository https://github.com/Miniwoffer/char_count
[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] 11fdfc45b5b6383f65e92ac8f94edc072350518e
[INFO] checking Miniwoffer/char_count against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMiniwoffer%2Fchar_count" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Miniwoffer/char_count 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/Miniwoffer/char_count
[INFO] finished tweaking git repo https://github.com/Miniwoffer/char_count
[INFO] tweaked toml for git repo https://github.com/Miniwoffer/char_count written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/Miniwoffer/char_count already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] f238b2ff00c667246c2852fbea3afb741c250ef673737ca942e75b1bbd79cb53
[INFO] running `"docker" "start" "-a" "f238b2ff00c667246c2852fbea3afb741c250ef673737ca942e75b1bbd79cb53"`
[INFO] [stderr]     Checking char_count v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `ac`
[INFO] [stderr]   --> src/main.rs:13:35
[INFO] [stderr]    |
[INFO] [stderr] 13 |     sorted_vec.sort_unstable_by(|(ac,ai),(bc,bi)| bi.cmp(ai));
[INFO] [stderr]    |                                   ^^ help: if this is intentional, prefix it with an underscore: `_ac`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `bc`
[INFO] [stderr]   --> src/main.rs:13:43
[INFO] [stderr]    |
[INFO] [stderr] 13 |     sorted_vec.sort_unstable_by(|(ac,ai),(bc,bi)| bi.cmp(ai));
[INFO] [stderr]    |                                           ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     io::stdin().read_to_string(&mut buffer);
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ac`
[INFO] [stderr]   --> src/main.rs:13:35
[INFO] [stderr]    |
[INFO] [stderr] 13 |     sorted_vec.sort_unstable_by(|(ac,ai),(bc,bi)| bi.cmp(ai));
[INFO] [stderr]    |                                   ^^ help: if this is intentional, prefix it with an underscore: `_ac`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `bc`
[INFO] [stderr]   --> src/main.rs:13:43
[INFO] [stderr]    |
[INFO] [stderr] 13 |     sorted_vec.sort_unstable_by(|(ac,ai),(bc,bi)| bi.cmp(ai));
[INFO] [stderr]    |                                           ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     io::stdin().read_to_string(&mut buffer);
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `"docker" "inspect" "f238b2ff00c667246c2852fbea3afb741c250ef673737ca942e75b1bbd79cb53"`
[INFO] running `"docker" "rm" "-f" "f238b2ff00c667246c2852fbea3afb741c250ef673737ca942e75b1bbd79cb53"`
[INFO] [stdout] f238b2ff00c667246c2852fbea3afb741c250ef673737ca942e75b1bbd79cb53