[INFO] cloning repository https://github.com/sabartheman/Rust_huffman_parallel
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sabartheman/Rust_huffman_parallel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabartheman%2FRust_huffman_parallel"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabartheman%2FRust_huffman_parallel'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9856ae702e29f7289fba9dfd14c861fcacf1362d
[INFO] checking sabartheman/Rust_huffman_parallel against try#ea663bba38739867a4b75ac820991b4f5d093c3b for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabartheman%2FRust_huffman_parallel" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sabartheman/Rust_huffman_parallel on toolchain ea663bba38739867a4b75ac820991b4f5d093c3b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/sabartheman/Rust_huffman_parallel
[INFO] finished tweaking git repo https://github.com/sabartheman/Rust_huffman_parallel
[INFO] tweaked toml for git repo https://github.com/sabartheman/Rust_huffman_parallel written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/sabartheman/Rust_huffman_parallel already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "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] e6d0c56c73f23ebd36d1f5ca37fa7ba76b67431ba9f685baa45c1ec11d2e9bbd
[INFO] running `"docker" "start" "-a" "e6d0c56c73f23ebd36d1f5ca37fa7ba76b67431ba9f685baa45c1ec11d2e9bbd"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking libc v0.2.34
[INFO] [stderr]     Checking crossbeam v0.3.0
[INFO] [stderr]     Checking time v0.1.38
[INFO] [stderr]     Checking huffman_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/main.rs:103:32
[INFO] [stderr]     |
[INFO] [stderr] 103 |             assign_codes(l, h, (s.clone() + "0"));
[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 function argument
[INFO] [stderr]    --> src/main.rs:106:32
[INFO] [stderr]     |
[INFO] [stderr] 106 |             assign_codes(r, h, (s.clone() + "1"));
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/main.rs:103:32
[INFO] [stderr]     |
[INFO] [stderr] 103 |             assign_codes(l, h, (s.clone() + "0"));
[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 function argument
[INFO] [stderr]    --> src/main.rs:106:32
[INFO] [stderr]     |
[INFO] [stderr] 106 |             assign_codes(r, h, (s.clone() + "1"));
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/main.rs:499:16
[INFO] [stderr]     |
[INFO] [stderr] 499 |     if let Err(e) = writeln!(file, "{},{},{},{},{},{},{},", tp1_finish - tp1_start, tp2_finish - tp2_start, tp3_finish - tp3_start, tp4_finish - tp4_start, t3-t1, t2-s2, t3-s3) {
[INFO] [stderr]     |                ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/main.rs:499:16
[INFO] [stderr]     |
[INFO] [stderr] 499 |     if let Err(e) = writeln!(file, "{},{},{},{},{},{},{},", tp1_finish - tp1_start, tp2_finish - tp2_start, tp3_finish - tp3_start, tp4_finish - tp4_start, t3-t1, t2-s2, t3-s3) {
[INFO] [stderr]     |                ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.93s
[INFO] running `"docker" "inspect" "e6d0c56c73f23ebd36d1f5ca37fa7ba76b67431ba9f685baa45c1ec11d2e9bbd"`
[INFO] running `"docker" "rm" "-f" "e6d0c56c73f23ebd36d1f5ca37fa7ba76b67431ba9f685baa45c1ec11d2e9bbd"`
[INFO] [stdout] e6d0c56c73f23ebd36d1f5ca37fa7ba76b67431ba9f685baa45c1ec11d2e9bbd