[INFO] cloning repository https://github.com/wychu413/compression
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wychu413/compression" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwychu413%2Fcompression", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwychu413%2Fcompression'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ae5b1571ff87a5fe67e09413bcdb2ee37536364b
[INFO] building wychu413/compression against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwychu413%2Fcompression" "/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/wychu413/compression on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wychu413/compression
[INFO] finished tweaking git repo https://github.com/wychu413/compression
[INFO] tweaked toml for git repo https://github.com/wychu413/compression written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/wychu413/compression 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.104
[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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4b0c40b05b628fcb850cf02ec5bd9b00b60bd95a7fc4e68591c838b889c679e7
[INFO] running `Command { std: "docker" "start" "-a" "4b0c40b05b628fcb850cf02ec5bd9b00b60bd95a7fc4e68591c838b889c679e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4b0c40b05b628fcb850cf02ec5bd9b00b60bd95a7fc4e68591c838b889c679e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b0c40b05b628fcb850cf02ec5bd9b00b60bd95a7fc4e68591c838b889c679e7", kill_on_drop: false }`
[INFO] [stdout] 4b0c40b05b628fcb850cf02ec5bd9b00b60bd95a7fc4e68591c838b889c679e7
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 68ce1f7e9c95457e98fae677614c825154fc180f9a4517bd63123dbd9f670003
[INFO] running `Command { std: "docker" "start" "-a" "68ce1f7e9c95457e98fae677614c825154fc180f9a4517bd63123dbd9f670003", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.104
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling compression v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `bit_vec::BitVec`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use bit_vec::BitVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `bit_vec::BitVec`
[INFO] [stdout]  --> src/compressor/huffman.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use bit_vec::BitVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `compressor::compressor::Compressor`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use compressor::compressor::Compressor;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]   --> src/compressor/huffman.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 |         let map = HashMap::<u8, u32>::new();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `algo`, `is_decompress`, `input_file`, and `output_file` are never read
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Config {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 15 |     // the algorithm to compress/decompress the data
[INFO] [stdout] 16 |     algo: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 17 |     // compress/decompress
[INFO] [stdout] 18 |     is_decompress: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 19 |     // the input file name
[INFO] [stdout] 20 |     input_file: String,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     output_file: String,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Config` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bytes_freq_count` is never used
[INFO] [stdout]  --> src/pkg/util.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn bytes_freq_count(bytes: &Vec<u8>) -> HashMap<u8, u32> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Compressor` is never constructed
[INFO] [stdout]  --> src/compressor/compressor.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Compressor
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `run` are never used
[INFO] [stdout]   --> src/compressor/compressor.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Compressor {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(alg: &str) -> Compressor {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn run(self, bytes: &Vec<u8>) -> Vec<u8> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `HuffmanTree` is never used
[INFO] [stdout]   --> src/compressor/huffman.rs:63:6
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum HuffmanTree {
[INFO] [stdout]    |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_node_frequency` and `make_canonical_huffman_code_table` are never used
[INFO] [stdout]   --> src/compressor/huffman.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 80 | impl HuffmanTree {
[INFO] [stdout]    | ---------------- methods in this implementation
[INFO] [stdout] 81 |     fn get_node_frequency(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |     fn make_canonical_huffman_code_table(&self) 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_tree` is never used
[INFO] [stdout]    --> src/compressor/huffman.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn make_tree(mut heap: BinaryHeap<Reverse<HuffmanTree>>) -> HuffmanTree {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compress` is never used
[INFO] [stdout]    --> src/compressor/huffman.rs:137:8
[INFO] [stdout]     |
[INFO] [stdout] 137 | pub fn compress(bytes: &Vec<u8>) -> Vec<u8> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.82s
[INFO] running `Command { std: "docker" "inspect" "68ce1f7e9c95457e98fae677614c825154fc180f9a4517bd63123dbd9f670003", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68ce1f7e9c95457e98fae677614c825154fc180f9a4517bd63123dbd9f670003", kill_on_drop: false }`
[INFO] [stdout] 68ce1f7e9c95457e98fae677614c825154fc180f9a4517bd63123dbd9f670003
[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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2a5b87c1cc73196fa42c8d542b282a5c92ce3c7fa58b8991d42651d442a20b88
[INFO] running `Command { std: "docker" "start" "-a" "2a5b87c1cc73196fa42c8d542b282a5c92ce3c7fa58b8991d42651d442a20b88", kill_on_drop: false }`
[INFO] [stderr]    Compiling compression v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `bit_vec::BitVec`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use bit_vec::BitVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `bit_vec::BitVec`
[INFO] [stdout]  --> src/compressor/huffman.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use bit_vec::BitVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `compressor::compressor::Compressor`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use compressor::compressor::Compressor;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]   --> src/compressor/huffman.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 |         let map = HashMap::<u8, u32>::new();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `algo`, `is_decompress`, `input_file`, and `output_file` are never read
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Config {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 15 |     // the algorithm to compress/decompress the data
[INFO] [stdout] 16 |     algo: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 17 |     // compress/decompress
[INFO] [stdout] 18 |     is_decompress: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 19 |     // the input file name
[INFO] [stdout] 20 |     input_file: String,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     output_file: String,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Config` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Compressor` is never constructed
[INFO] [stdout]  --> src/compressor/compressor.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Compressor
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `run` are never used
[INFO] [stdout]   --> src/compressor/compressor.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Compressor {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(alg: &str) -> Compressor {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn run(self, bytes: &Vec<u8>) -> Vec<u8> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `symbol` is never read
[INFO] [stdout]   --> src/compressor/huffman.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     Leaf {
[INFO] [stdout]    |     ---- field in this variant
[INFO] [stdout] 66 |         freq: u32,
[INFO] [stdout] 67 |         symbol: u8,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `HuffmanTree` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `left` and `right` are never read
[INFO] [stdout]   --> src/compressor/huffman.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |     Tree {
[INFO] [stdout]    |     ---- fields in this variant
[INFO] [stdout] ...
[INFO] [stdout] 74 |         left: Box<HuffmanTree>,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 75 |         // Right SubTree
[INFO] [stdout] 76 |         right: Box<HuffmanTree>,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `HuffmanTree` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `make_canonical_huffman_code_table` is never used
[INFO] [stdout]   --> src/compressor/huffman.rs:88:8
[INFO] [stdout]    |
[INFO] [stdout] 80 | impl HuffmanTree {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 88 |     fn make_canonical_huffman_code_table(&self) 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compress` is never used
[INFO] [stdout]    --> src/compressor/huffman.rs:137:8
[INFO] [stdout]     |
[INFO] [stdout] 137 | pub fn compress(bytes: &Vec<u8>) -> Vec<u8> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.74s
[INFO] running `Command { std: "docker" "inspect" "2a5b87c1cc73196fa42c8d542b282a5c92ce3c7fa58b8991d42651d442a20b88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a5b87c1cc73196fa42c8d542b282a5c92ce3c7fa58b8991d42651d442a20b88", kill_on_drop: false }`
[INFO] [stdout] 2a5b87c1cc73196fa42c8d542b282a5c92ce3c7fa58b8991d42651d442a20b88