[INFO] cloning repository https://github.com/zoewithabang/rust-markov-chain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zoewithabang/rust-markov-chain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzoewithabang%2Frust-markov-chain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzoewithabang%2Frust-markov-chain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bf3658652f55d8bfc018ff0b598741a6c2892429
[INFO] checking zoewithabang/rust-markov-chain against try#6f12b8fe67b4eed2e838dab803ed9493b9d62c0f for pr-79073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzoewithabang%2Frust-markov-chain" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zoewithabang/rust-markov-chain on toolchain 6f12b8fe67b4eed2e838dab803ed9493b9d62c0f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-0/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 `Command { std: "/workspace/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded stackvector v1.0.2
[INFO] [stderr]   Downloaded block-padding v0.1.3
[INFO] [stderr]   Downloaded twox-hash v1.2.0
[INFO] [stderr]   Downloaded lexical-core v0.4.0
[INFO] [stderr]   Downloaded lexical v2.1.0
[INFO] [stderr]   Downloaded mysql_common v0.17.0
[INFO] [stderr]   Downloaded mysql v16.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] df66c7802e7dd0cf7d78de0ff93a84368a1598bc72a57d7477a368438f2e059a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "df66c7802e7dd0cf7d78de0ff93a84368a1598bc72a57d7477a368438f2e059a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "df66c7802e7dd0cf7d78de0ff93a84368a1598bc72a57d7477a368438f2e059a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df66c7802e7dd0cf7d78de0ff93a84368a1598bc72a57d7477a368438f2e059a", kill_on_drop: false }`
[INFO] [stdout] df66c7802e7dd0cf7d78de0ff93a84368a1598bc72a57d7477a368438f2e059a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] db9c5591f1a63a307a370da57cb3b9cf727ef80ed0a9cb078e9a7ad933d79c1e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "db9c5591f1a63a307a370da57cb3b9cf727ef80ed0a9cb078e9a7ad933d79c1e", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling syn v0.15.32
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking static_assertions v0.2.5
[INFO] [stderr]     Checking opaque-debug v0.2.2
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]    Compiling nix v0.13.0
[INFO] [stderr]    Compiling mysql v16.0.0
[INFO] [stderr]     Checking bit-vec v0.5.1
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking bufstream v0.1.4
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]    Compiling miniz-sys v0.1.11
[INFO] [stderr]     Checking block-padding v0.1.3
[INFO] [stderr]     Checking crc32fast v1.2.0
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]     Checking generic-array v0.12.0
[INFO] [stderr]     Checking backtrace-sys v0.1.28
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking stackvector v1.0.2
[INFO] [stderr]     Checking backtrace v0.3.15
[INFO] [stderr]     Checking digest v0.8.0
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking lexical-core v0.4.0
[INFO] [stderr]     Checking sha2 v0.8.0
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]     Checking flate2 v1.0.7
[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 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] [stdout] warning: unused variable: `prefix_size`
[INFO] [stdout]   --> src/markov.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 61 |     prefix_size: &u32,
[INFO] [stdout]    |     ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prefix_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prefix_size`
[INFO] [stdout]   --> src/markov.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 61 |     prefix_size: &u32,
[INFO] [stdout]    |     ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prefix_size`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `output`
[INFO] [stdout]   --> src/markov_table.rs:93:13
[INFO] [stdout]    |
[INFO] [stdout] 93 |         let output = build_markov_table(source_messages, prefix_size);
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_output`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 38.16s
[INFO] running `Command { std: "docker" "inspect" "db9c5591f1a63a307a370da57cb3b9cf727ef80ed0a9cb078e9a7ad933d79c1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db9c5591f1a63a307a370da57cb3b9cf727ef80ed0a9cb078e9a7ad933d79c1e", kill_on_drop: false }`
[INFO] [stdout] db9c5591f1a63a307a370da57cb3b9cf727ef80ed0a9cb078e9a7ad933d79c1e