[INFO] cloning repository https://github.com/ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArchismanKarmakar%2FHuffman-Encoding-Compression-Algorithm-in-RUST", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArchismanKarmakar%2FHuffman-Encoding-Compression-Algorithm-in-RUST'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 507f7f0765636d191e0d5f59a56d3f66dae4bcf0
[INFO] checking ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArchismanKarmakar%2FHuffman-Encoding-Compression-Algorithm-in-RUST" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST
[INFO] finished tweaking git repo https://github.com/ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST
[INFO] tweaked toml for git repo https://github.com/ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ArchismanKarmakar/Huffman-Encoding-Compression-Algorithm-in-RUST 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d84e659555f180e8966854220a3b4ce3f3738c976b66bdc0c7816ece72a83f8a
[INFO] running `Command { std: "docker" "start" "-a" "d84e659555f180e8966854220a3b4ce3f3738c976b66bdc0c7816ece72a83f8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d84e659555f180e8966854220a3b4ce3f3738c976b66bdc0c7816ece72a83f8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d84e659555f180e8966854220a3b4ce3f3738c976b66bdc0c7816ece72a83f8a", kill_on_drop: false }`
[INFO] [stdout] d84e659555f180e8966854220a3b4ce3f3738c976b66bdc0c7816ece72a83f8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 81b97077a69967d8e4806bbb1d36625f2c6476eb3510014869804e2da7db0921
[INFO] running `Command { std: "docker" "start" "-a" "81b97077a69967d8e4806bbb1d36625f2c6476eb3510014869804e2da7db0921", kill_on_drop: false }`
[INFO] [stderr]     Checking huffman-compression-rust v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/huffman.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::io;
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]   --> src/huffman.rs:12:44
[INFO] [stdout]    |
[INFO] [stdout] 12 |         use std::collections::{BinaryHeap, HashMap};
[INFO] [stdout]    |                                            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]   --> src/huffman.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |         use std::ops::Deref;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/huffman.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::io;
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]   --> src/huffman.rs:12:44
[INFO] [stdout]    |
[INFO] [stdout] 12 |         use std::collections::{BinaryHeap, HashMap};
[INFO] [stdout]    |                                            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]   --> src/huffman.rs:15:13
[INFO] [stdout]    |
[INFO] [stdout] 15 |         use std::ops::Deref;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/huffman.rs:249:13
[INFO] [stdout]     |
[INFO] [stdout] 249 |         let mut frequency_table = match binary {
[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/huffman.rs:249:13
[INFO] [stdout]     |
[INFO] [stdout] 249 |         let mut frequency_table = match binary {
[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 `Q` should have a snake case name
[INFO] [stdout]   --> src/huffman.rs:90:21
[INFO] [stdout]    |
[INFO] [stdout] 90 |             let mut Q = BinaryHeap::new();
[INFO] [stdout]    |                     ^ help: convert the identifier to snake case: `q`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Q` should have a snake case name
[INFO] [stdout]    --> src/huffman.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |             let mut Q = self::build_min_heap(&frequency_table);
[INFO] [stdout]     |                     ^ help: convert the identifier to snake case: `q`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Q` should have a snake case name
[INFO] [stdout]   --> src/huffman.rs:90:21
[INFO] [stdout]    |
[INFO] [stdout] 90 |             let mut Q = BinaryHeap::new();
[INFO] [stdout]    |                     ^ help: convert the identifier to snake case: `q`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Q` should have a snake case name
[INFO] [stdout]    --> src/huffman.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |             let mut Q = self::build_min_heap(&frequency_table);
[INFO] [stdout]     |                     ^ help: convert the identifier to snake case: `q`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "81b97077a69967d8e4806bbb1d36625f2c6476eb3510014869804e2da7db0921", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81b97077a69967d8e4806bbb1d36625f2c6476eb3510014869804e2da7db0921", kill_on_drop: false }`
[INFO] [stdout] 81b97077a69967d8e4806bbb1d36625f2c6476eb3510014869804e2da7db0921