[INFO] updating cached repository https://github.com/zoewithabang/rust-markov-chain
[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] bf3658652f55d8bfc018ff0b598741a6c2892429
[INFO] checking zoewithabang/rust-markov-chain against master#6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257 for pr-70872
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzoewithabang%2Frust-markov-chain" "/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/zoewithabang/rust-markov-chain on toolchain 6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/zoewithabang/rust-markov-chain
[INFO] finished tweaking git repo https://github.com/zoewithabang/rust-markov-chain
[INFO] tweaked toml for git repo https://github.com/zoewithabang/rust-markov-chain written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/zoewithabang/rust-markov-chain already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "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-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" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "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] 9670f4ea6a2b50707d3a7f425fce260f4e50aa9d9118ebb8886b81041efaaa28
[INFO] running `"docker" "start" "-a" "9670f4ea6a2b50707d3a7f425fce260f4e50aa9d9118ebb8886b81041efaaa28"`
[INFO] [stderr]    Compiling syn v0.15.32
[INFO] [stderr]    Compiling mysql v16.0.0
[INFO] [stderr]     Checking stackvector v1.0.2
[INFO] [stderr]     Checking miniz-sys v0.1.11
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking twox-hash v1.2.0
[INFO] [stderr]     Checking num-bigint v0.2.2
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking flate2 v1.0.7
[INFO] [stderr]     Checking sha2 v0.8.0
[INFO] [stderr]     Checking lexical-core v0.4.0
[INFO] [stderr]     Checking lexical v2.1.0
[INFO] [stderr]     Checking mysql_common v0.17.0
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking dotenv v0.13.0
[INFO] [stderr]     Checking markov v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `prefix_size`
[INFO] [stderr]   --> src/markov.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 |     prefix_size: &u32,
[INFO] [stderr]    |     ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prefix_size`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prefix_size`
[INFO] [stderr]   --> src/markov.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 |     prefix_size: &u32,
[INFO] [stderr]    |     ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prefix_size`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `output`
[INFO] [stderr]   --> src/markov_table.rs:93:13
[INFO] [stderr]    |
[INFO] [stderr] 93 |         let output = build_markov_table(source_messages, prefix_size);
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_output`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 39.16s
[INFO] running `"docker" "inspect" "9670f4ea6a2b50707d3a7f425fce260f4e50aa9d9118ebb8886b81041efaaa28"`
[INFO] running `"docker" "rm" "-f" "9670f4ea6a2b50707d3a7f425fce260f4e50aa9d9118ebb8886b81041efaaa28"`
[INFO] [stdout] 9670f4ea6a2b50707d3a7f425fce260f4e50aa9d9118ebb8886b81041efaaa28