[INFO] fetching crate stackpack 0.1.1...
[INFO] testing stackpack-0.1.1 against try#c2e32f1c9652b13ed99608599c1e855462f421f3 for pr-146098-7
[INFO] extracting crate stackpack 0.1.1 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate stackpack 0.1.1
[INFO] finished tweaking crates.io crate stackpack 0.1.1
[INFO] tweaked toml for crates.io crate stackpack 0.1.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate stackpack 0.1.1 on toolchain c2e32f1c9652b13ed99608599c1e855462f421f3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate stackpack 0.1.1 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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 52de236a158711b4c787f3e9feb8eaaae8cdf5a9eec65a679cd515bbf5ef48f0
[INFO] running `Command { std: "docker" "start" "-a" "52de236a158711b4c787f3e9feb8eaaae8cdf5a9eec65a679cd515bbf5ef48f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "52de236a158711b4c787f3e9feb8eaaae8cdf5a9eec65a679cd515bbf5ef48f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52de236a158711b4c787f3e9feb8eaaae8cdf5a9eec65a679cd515bbf5ef48f0", kill_on_drop: false }`
[INFO] [stdout] 52de236a158711b4c787f3e9feb8eaaae8cdf5a9eec65a679cd515bbf5ef48f0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb48b13b9498753c70acd26ed741dc0cc46436dc23a3ce328df2455ab7aa7bce
[INFO] running `Command { std: "docker" "start" "-a" "bb48b13b9498753c70acd26ed741dc0cc46436dc23a3ce328df2455ab7aa7bce", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.94
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]    Compiling anyhow v1.0.97
[INFO] [stderr]    Compiling bitbit v0.2.0
[INFO] [stderr]    Compiling fenwick v1.0.0
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling lzw v0.10.0
[INFO] [stderr]    Compiling arcode v0.2.4
[INFO] [stderr]    Compiling quote v1.0.39
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling voxell_rng v0.5.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling derive_fromstr v0.1.0
[INFO] [stderr]    Compiling stackpack v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::ffi::OsStr`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::ffi::OsStr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `algorithms::rle2::Rle2`
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use algorithms::rle2::Rle2;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DefaultHasher`
[INFO] [stdout]  --> src/algorithms/re_pair.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 |     hash::{DefaultHasher, Hasher},
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DecompressionError`
[INFO] [stdout]  --> src/algorithms/re_pair.rs:8:37
[INFO] [stdout]   |
[INFO] [stdout] 8 | use crate::compressor::{Compressor, DecompressionError, Result};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Hasher`
[INFO] [stdout]  --> src/algorithms/re_pair.rs:5:27
[INFO] [stdout]   |
[INFO] [stdout] 5 |     hash::{DefaultHasher, Hasher},
[INFO] [stdout]   |                           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/algorithms/huffman.rs:23:38
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn huffman_encode(&mut self, data: &[u8]) -> Vec<u8> {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/algorithms/huffman.rs:27:38
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn huffman_decode(&mut self, data: &[u8]) -> Result<Vec<u8>, DecompressionError> {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/algorithms/re_pair.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let mut grammar = Grammar { inner: initial_values };
[INFO] [stdout]    |             ----^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/algorithms/re_pair.rs:62:13
[INFO] [stdout]    |
[INFO] [stdout] 62 |         let mut charlist = data.iter().map(|&byte| Symbol::Short(u32::from(byte))).collect::<Vec<_>>();
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grammar`
[INFO] [stdout]   --> src/algorithms/re_pair.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let mut grammar = Grammar { inner: initial_values };
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grammar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `HuffmanCoding` is never constructed
[INFO] [stdout]  --> src/algorithms/huffman.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct HuffmanCoding;
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `huffman_encode` and `huffman_decode` are never used
[INFO] [stdout]   --> src/algorithms/huffman.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl HuffmanCoding {
[INFO] [stdout]    | ------------------ methods in this implementation
[INFO] [stdout] 23 |     pub fn huffman_encode(&mut self, data: &[u8]) -> Vec<u8> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn huffman_decode(&mut self, data: &[u8]) -> Result<Vec<u8>, DecompressionError> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RePair` is never constructed
[INFO] [stdout]   --> src/algorithms/re_pair.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct RePair {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `GrammarIndexOrRawByte` is never used
[INFO] [stdout]   --> src/algorithms/re_pair.rs:30:6
[INFO] [stdout]    |
[INFO] [stdout] 30 | type GrammarIndexOrRawByte = u32;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Symbol` is never used
[INFO] [stdout]   --> src/algorithms/re_pair.rs:33:10
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub enum Symbol {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Grammar` is never constructed
[INFO] [stdout]   --> src/algorithms/re_pair.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub struct Grammar {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `repair_encode` and `repair_decode` are never used
[INFO] [stdout]   --> src/algorithms/re_pair.rs:59:12
[INFO] [stdout]    |
[INFO] [stdout] 58 | impl RePair {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] 59 |     pub fn repair_encode(&mut self, data: &[u8]) -> Vec<u8> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn repair_decode(&mut self, data: &[u8]) -> Result<Vec<u8>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RecursiveRle` is never constructed
[INFO] [stdout]  --> src/algorithms/recursive_rle.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct RecursiveRle {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rrle_encode` is never used
[INFO] [stdout]   --> src/algorithms/recursive_rle.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn rrle_encode(data: &[u8]) -> Vec<u8> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rrle_decode` is never used
[INFO] [stdout]   --> src/algorithms/recursive_rle.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 | pub fn rrle_decode(data: &[u8]) -> Result<Vec<u8>> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rle` is never constructed
[INFO] [stdout]   --> src/algorithms/rle.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Rle {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RleChunk` is never constructed
[INFO] [stdout]   --> src/algorithms/rle.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | struct RleChunk {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hexify` is never used
[INFO] [stdout]   --> src/algorithms/rle.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn hexify(data: &[u8]) -> String {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_size` is never used
[INFO] [stdout]   --> src/algorithms/rle.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | impl RleChunk {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] 61 |     fn get_size(&self) -> usize {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ReadRleChunk` is never used
[INFO] [stdout]   --> src/algorithms/rle.rs:66:7
[INFO] [stdout]    |
[INFO] [stdout] 66 | trait ReadRleChunk {
[INFO] [stdout]    |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `chunkfinder`, `rle_encode`, `find_optimal_chunk`, and `rle_decode` are never used
[INFO] [stdout]    --> src/algorithms/rle.rs:93:8
[INFO] [stdout]     |
[INFO] [stdout]  91 | impl Rle {
[INFO] [stdout]     | -------- methods in this implementation
[INFO] [stdout]  92 |     /// represents the given data using RLE chunks.
[INFO] [stdout]  93 |     fn chunkfinder(&self, data: &[u8]) -> Vec<RleChunk> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 107 |     pub fn rle_encode(&self, data: &[u8]) -> Vec<u8> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 126 |     fn find_optimal_chunk(&self, data: &[u8], start: usize) -> (RleChunk, usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 223 |     pub fn rle_decode(&self, data: &[u8]) -> Result<Vec<u8>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rle2` is never constructed
[INFO] [stdout]   --> src/algorithms/rle2.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Rle2;
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RleChunk2` is never constructed
[INFO] [stdout]   --> src/algorithms/rle2.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct RleChunk2 {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hexify` is never used
[INFO] [stdout]   --> src/algorithms/rle2.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn hexify(data: &[u8]) -> String {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_size` is never used
[INFO] [stdout]   --> src/algorithms/rle2.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | impl RleChunk2 {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 60 |     fn get_size(&self) -> usize {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ReadRleChunk` is never used
[INFO] [stdout]   --> src/algorithms/rle2.rs:65:7
[INFO] [stdout]    |
[INFO] [stdout] 65 | trait ReadRleChunk {
[INFO] [stdout]    |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `rle_encode` and `rle_decode` are never used
[INFO] [stdout]    --> src/algorithms/rle2.rs:91:12
[INFO] [stdout]     |
[INFO] [stdout]  90 | impl Rle2 {
[INFO] [stdout]     | --------- methods in this implementation
[INFO] [stdout]  91 |     pub fn rle_encode(&self, data: &[u8]) -> Vec<u8> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 144 |     pub fn rle_decode(&self, data: &[u8]) -> Result<Vec<u8>, io::Error> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `try_join_chunks` is never used
[INFO] [stdout]    --> src/algorithms/rle2.rs:178:4
[INFO] [stdout]     |
[INFO] [stdout] 178 | fn try_join_chunks(first: &RleChunk2, second: &RleChunk2) -> Option<RleChunk2> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `aggregate_chunks` is never used
[INFO] [stdout]    --> src/algorithms/rle2.rs:256:8
[INFO] [stdout]     |
[INFO] [stdout] 256 | pub fn aggregate_chunks(chunks: &[RleChunk2]) -> Vec<RleChunk2> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `push_algorithm` is never used
[INFO] [stdout]   --> src/algorithms/pipeline.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl CompressionPipeline {
[INFO] [stdout]    | ------------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub fn push_algorithm<A: Compressor>(&mut self, algorithm: A) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `InternalDecoderError` is never constructed
[INFO] [stdout]   --> src/compressor.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout]  8 | pub enum DecompressionError {
[INFO] [stdout]    |          ------------------ variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 15 |     InternalDecoderError,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DecompressionError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `compressor_name` and `test_roundtrip` are never used
[INFO] [stdout]   --> src/compressor.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub trait Compressor: 'static {
[INFO] [stdout]    |           ---------- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 62 |     fn compressor_name(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |     fn test_roundtrip<'orig>(&mut self, data: &'orig [u8]) -> Result<RoundTripTestResult<'orig>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RoundTripTestResult` is never constructed
[INFO] [stdout]   --> src/compressor.rs:99:12
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub struct RoundTripTestResult<'orig> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_successful`, `get_original`, `get_compressed`, and `get_decompressed` are never used
[INFO] [stdout]    --> src/compressor.rs:108:18
[INFO] [stdout]     |
[INFO] [stdout] 106 | impl<'orig> RoundTripTestResult<'orig> {
[INFO] [stdout]     | -------------------------------------- methods in this implementation
[INFO] [stdout] 107 |     /// Whether the original and decompressed data were equal.
[INFO] [stdout] 108 |     pub const fn is_successful(&self) -> bool {
[INFO] [stdout]     |                  ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 113 |     pub const fn get_original(&self) -> &'orig [u8] {
[INFO] [stdout]     |                  ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 118 |     pub fn get_compressed(&self) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 123 |     pub fn get_decompressed(&self) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.09s
[INFO] running `Command { std: "docker" "inspect" "bb48b13b9498753c70acd26ed741dc0cc46436dc23a3ce328df2455ab7aa7bce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb48b13b9498753c70acd26ed741dc0cc46436dc23a3ce328df2455ab7aa7bce", kill_on_drop: false }`
[INFO] [stdout] bb48b13b9498753c70acd26ed741dc0cc46436dc23a3ce328df2455ab7aa7bce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9acaa2dd92ae573a907a06a9e69751b3272e2c22577d4d4b547c76cecbf6821e
[INFO] running `Command { std: "docker" "start" "-a" "9acaa2dd92ae573a907a06a9e69751b3272e2c22577d4d4b547c76cecbf6821e", kill_on_drop: false }`
[INFO] [stderr]    Compiling stackpack v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::ffi::OsStr`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::ffi::OsStr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `algorithms::rle2::Rle2`
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use algorithms::rle2::Rle2;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DefaultHasher`
[INFO] [stdout]  --> src/algorithms/re_pair.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 |     hash::{DefaultHasher, Hasher},
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DecompressionError`
[INFO] [stdout]  --> src/algorithms/re_pair.rs:8:37
[INFO] [stdout]   |
[INFO] [stdout] 8 | use crate::compressor::{Compressor, DecompressionError, Result};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/tests.rs:11:29
[INFO] [stdout]    |
[INFO] [stdout] 11 | const LONGEST_DATA: &[u8] = "shim";
[INFO] [stdout]    |                             ^^^^^^ expected `&[u8]`, found `&str`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&'static [u8]`
[INFO] [stdout]               found reference `&'static str`
[INFO] [stdout] help: consider adding a leading `b`
[INFO] [stdout]    |
[INFO] [stdout] 11 | const LONGEST_DATA: &[u8] = b"shim";
[INFO] [stdout]    |                             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/tests.rs:14:28
[INFO] [stdout]    |
[INFO] [stdout] 14 | const BINARY_DATA: &[u8] = "shim";
[INFO] [stdout]    |                            ^^^^^^ expected `&[u8]`, found `&str`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&'static [u8]`
[INFO] [stdout]               found reference `&'static str`
[INFO] [stdout] help: consider adding a leading `b`
[INFO] [stdout]    |
[INFO] [stdout] 14 | const BINARY_DATA: &[u8] = b"shim";
[INFO] [stdout]    |                            +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Hasher`
[INFO] [stdout]  --> src/algorithms/re_pair.rs:5:27
[INFO] [stdout]   |
[INFO] [stdout] 5 |     hash::{DefaultHasher, Hasher},
[INFO] [stdout]   |                           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/algorithms/huffman.rs:23:38
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn huffman_encode(&mut self, data: &[u8]) -> Vec<u8> {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/algorithms/huffman.rs:27:38
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn huffman_decode(&mut self, data: &[u8]) -> Result<Vec<u8>, DecompressionError> {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/algorithms/re_pair.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let mut grammar = Grammar { inner: initial_values };
[INFO] [stdout]    |             ----^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/algorithms/re_pair.rs:62:13
[INFO] [stdout]    |
[INFO] [stdout] 62 |         let mut charlist = data.iter().map(|&byte| Symbol::Short(u32::from(byte))).collect::<Vec<_>>();
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grammar`
[INFO] [stdout]   --> src/algorithms/re_pair.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let mut grammar = Grammar { inner: initial_values };
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grammar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/algorithms/pipeline.rs:113:13
[INFO] [stdout]     |
[INFO] [stdout] 113 |         let mut pipelines = vec![
[INFO] [stdout]     |             ----^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/algorithms/pipeline.rs:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |         for mut pipeline in pipelines {
[INFO] [stdout]     |             ----^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `stackpack` (bin "stackpack" test) due to 2 previous errors; 12 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "9acaa2dd92ae573a907a06a9e69751b3272e2c22577d4d4b547c76cecbf6821e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9acaa2dd92ae573a907a06a9e69751b3272e2c22577d4d4b547c76cecbf6821e", kill_on_drop: false }`
[INFO] [stdout] 9acaa2dd92ae573a907a06a9e69751b3272e2c22577d4d4b547c76cecbf6821e
