[INFO] cloning repository https://github.com/Agastya18/pied-piper
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Agastya18/pied-piper" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAgastya18%2Fpied-piper", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAgastya18%2Fpied-piper'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1ff2bbc785867fe5752537fced8a324ea4201b6d
[INFO] checking Agastya18/pied-piper against master#3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0 for pr-143164
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAgastya18%2Fpied-piper" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Agastya18/pied-piper
[INFO] finished tweaking git repo https://github.com/Agastya18/pied-piper
[INFO] tweaked toml for git repo https://github.com/Agastya18/pied-piper written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Agastya18/pied-piper on toolchain 3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Agastya18/pied-piper 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" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5bdfd8bef819a8ff4bd922cc957a803017045b74edae809b47499499da8ff587
[INFO] running `Command { std: "docker" "start" "-a" "5bdfd8bef819a8ff4bd922cc957a803017045b74edae809b47499499da8ff587", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5bdfd8bef819a8ff4bd922cc957a803017045b74edae809b47499499da8ff587", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bdfd8bef819a8ff4bd922cc957a803017045b74edae809b47499499da8ff587", kill_on_drop: false }`
[INFO] [stdout] 5bdfd8bef819a8ff4bd922cc957a803017045b74edae809b47499499da8ff587
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+3129d37ef7075ee3cbaa3d6cbe1b5794f67192b0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f247d96dbc54eeec43eb93a3610ae30980f275056d15e3427e0eda34dffe95e1
[INFO] running `Command { std: "docker" "start" "-a" "f247d96dbc54eeec43eb93a3610ae30980f275056d15e3427e0eda34dffe95e1", kill_on_drop: false }`
[INFO] [stderr]     Checking pied-piper v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/utils.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/utils.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `decode`
[INFO] [stdout]  --> src/main.rs:4:35
[INFO] [stdout]   |
[INFO] [stdout] 4 | use huffman::{build_huffman_tree, decode, encode, generate_codes};
[INFO] [stdout]   |                                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `decode`
[INFO] [stdout]  --> src/main.rs:4:35
[INFO] [stdout]   |
[INFO] [stdout] 4 | use huffman::{build_huffman_tree, decode, encode, generate_codes};
[INFO] [stdout]   |                                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `decode` is never used
[INFO] [stdout]   --> src/huffman.rs:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 | pub fn decode(encoded_text: &str, root: &Node) -> String {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `decode` is never used
[INFO] [stdout]   --> src/huffman.rs:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 | pub fn decode(encoded_text: &str, root: &Node) -> String {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.33s
[INFO] running `Command { std: "docker" "inspect" "f247d96dbc54eeec43eb93a3610ae30980f275056d15e3427e0eda34dffe95e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f247d96dbc54eeec43eb93a3610ae30980f275056d15e3427e0eda34dffe95e1", kill_on_drop: false }`
[INFO] [stdout] f247d96dbc54eeec43eb93a3610ae30980f275056d15e3427e0eda34dffe95e1
