[INFO] cloning repository https://github.com/trexlernoah/rust-huffman
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/trexlernoah/rust-huffman" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrexlernoah%2Frust-huffman", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrexlernoah%2Frust-huffman'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f8a42eae67481f2310ce41bc5d92872419a8119a
[INFO] checking trexlernoah/rust-huffman against master#c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrexlernoah%2Frust-huffman" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/trexlernoah/rust-huffman on toolchain c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/trexlernoah/rust-huffman
[INFO] finished tweaking git repo https://github.com/trexlernoah/rust-huffman
[INFO] tweaked toml for git repo https://github.com/trexlernoah/rust-huffman written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/trexlernoah/rust-huffman already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f274333ed8334e0fbe61f73d3bce873ec83cc61db296230bf68f1c1a068b651
[INFO] running `Command { std: "docker" "start" "-a" "8f274333ed8334e0fbe61f73d3bce873ec83cc61db296230bf68f1c1a068b651", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f274333ed8334e0fbe61f73d3bce873ec83cc61db296230bf68f1c1a068b651", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f274333ed8334e0fbe61f73d3bce873ec83cc61db296230bf68f1c1a068b651", kill_on_drop: false }`
[INFO] [stdout] 8f274333ed8334e0fbe61f73d3bce873ec83cc61db296230bf68f1c1a068b651
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 56c0dcd8d64097f3f478678fb47f9145b079c33740fa565a7d9e0ffa1d65126e
[INFO] running `Command { std: "docker" "start" "-a" "56c0dcd8d64097f3f478678fb47f9145b079c33740fa565a7d9e0ffa1d65126e", kill_on_drop: false }`
[INFO] [stderr]     Checking huffman v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let mut vec: Vec<u8> = Vec::new();
[INFO] [stdout]    |         ----^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let mut vec: Vec<u8> = Vec::new();
[INFO] [stdout]    |         ----^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "56c0dcd8d64097f3f478678fb47f9145b079c33740fa565a7d9e0ffa1d65126e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56c0dcd8d64097f3f478678fb47f9145b079c33740fa565a7d9e0ffa1d65126e", kill_on_drop: false }`
[INFO] [stdout] 56c0dcd8d64097f3f478678fb47f9145b079c33740fa565a7d9e0ffa1d65126e