[INFO] updating cached repository murphym18/huffman_code
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/murphym18/huffman_code
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/murphym18/huffman_code" "work/ex/clippy-test-run/sources/stable/gh/murphym18/huffman_code"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/murphym18/huffman_code'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/murphym18/huffman_code" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/murphym18/huffman_code"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/murphym18/huffman_code'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f3ea7042d973b2b4d28d24284e0d37efc1867cb3
[INFO] sha for GitHub repo murphym18/huffman_code: f3ea7042d973b2b4d28d24284e0d37efc1867cb3
[INFO] validating manifest of murphym18/huffman_code on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of murphym18/huffman_code on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing murphym18/huffman_code
[INFO] finished frobbing murphym18/huffman_code
[INFO] frobbed toml for murphym18/huffman_code written to work/ex/clippy-test-run/sources/stable/gh/murphym18/huffman_code/Cargo.toml
[INFO] started frobbing murphym18/huffman_code
[INFO] finished frobbing murphym18/huffman_code
[INFO] frobbed toml for murphym18/huffman_code written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/murphym18/huffman_code/Cargo.toml
[INFO] crate murphym18/huffman_code has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting murphym18/huffman_code against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/murphym18/huffman_code:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] a83235dd6c85d091ed503d511382a3e4581655f71af6f9f2497d3ae509353f19
[INFO] running `"docker" "start" "-a" "a83235dd6c85d091ed503d511382a3e4581655f71af6f9f2497d3ae509353f19"`
[INFO] [stderr]     Checking huffman_code v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/lib.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Cursor`
[INFO] [stderr]  --> src/lib.rs:5:28
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io::{Read, Write, Cursor};
[INFO] [stderr]   |                            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/lib.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Cursor`
[INFO] [stderr]  --> src/lib.rs:5:28
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io::{Read, Write, Cursor};
[INFO] [stderr]   |                            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `left`
[INFO] [stderr]    --> src/lib.rs:171:26
[INFO] [stderr]     |
[INFO] [stderr] 171 |         Node {count, ref left, ref right} => count,
[INFO] [stderr]     |                          ^^^^ help: try ignoring the field: `left: _`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `right`
[INFO] [stderr]    --> src/lib.rs:171:36
[INFO] [stderr]     |
[INFO] [stderr] 171 |         Node {count, ref left, ref right} => count,
[INFO] [stderr]     |                                    ^^^^^ help: try ignoring the field: `right: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:172:22
[INFO] [stderr]     |
[INFO] [stderr] 172 |         Leaf {count, value} => count
[INFO] [stderr]     |                      ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:178:15
[INFO] [stderr]     |
[INFO] [stderr] 178 |         Node {count, ref left, ref right} => {
[INFO] [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:235:19
[INFO] [stderr]     |
[INFO] [stderr] 235 |             Leaf {count, value} => {
[INFO] [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:240:19
[INFO] [stderr]     |
[INFO] [stderr] 240 |             Node {count, ref left, ref right} => {
[INFO] [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `p`
[INFO] [stderr]    --> src/lib.rs:303:9
[INFO] [stderr]     |
[INFO] [stderr] 303 |     let p = 97 as u8;
[INFO] [stderr]     |         ^ help: consider using `_p` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:346:26
[INFO] [stderr]     |
[INFO] [stderr] 346 |             Leaf {count, value} => size = size + count,
[INFO] [stderr]     |                          ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:395:15
[INFO] [stderr]     |
[INFO] [stderr] 395 |         Node {count, ref left, ref right} => {
[INFO] [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:403:15
[INFO] [stderr]     |
[INFO] [stderr] 403 |         Leaf {count, value}  => {
[INFO] [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:215:9
[INFO] [stderr]     |
[INFO] [stderr] 215 |     let mut tree = make_tree(table_vec);
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:300:9
[INFO] [stderr]     |
[INFO] [stderr] 300 |     let mut tree = make_tree(v);
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:350:9
[INFO] [stderr]     |
[INFO] [stderr] 350 |     let mut buf: [u8; 8] = unsafe {
[INFO] [stderr]     |         ----^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:388:9
[INFO] [stderr]     |
[INFO] [stderr] 388 |     let mut bits = BitString::new();
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:393:29
[INFO] [stderr]     |
[INFO] [stderr] 393 | fn traverse(current: &Tree, mut bits: BitString, table: &mut HashMap<u8, BitString>) {
[INFO] [stderr]     |                             ----^^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `byte_string`
[INFO] [stderr]    --> src/lib.rs:138:1
[INFO] [stderr]     |
[INFO] [stderr] 138 | fn byte_string(data: u8, num_bits: u8) -> String {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: item `BitString` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]   --> src/lib.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | / impl BitString {
[INFO] [stderr] 32 | |     pub fn new() -> BitString {
[INFO] [stderr] 33 | |         BitString { data: Vec::new() }
[INFO] [stderr] 34 | |     }
[INFO] [stderr] ...  |
[INFO] [stderr] 66 | |     }
[INFO] [stderr] 67 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `BitString`
[INFO] [stderr]   --> src/lib.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 | /     pub fn new() -> BitString {
[INFO] [stderr] 33 | |         BitString { data: Vec::new() }
[INFO] [stderr] 34 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 27 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/lib.rs:88:13
[INFO] [stderr]    |
[INFO] [stderr] 88 |             self.next_byte = self.next_byte | (bits.get(i) << self.next_bit_index);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.next_byte |= (bits.get(i) << self.next_bit_index)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         self.output.write(&a);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:133:9
[INFO] [stderr]     |
[INFO] [stderr] 133 |         self.next_bit = self.next_bit + 1;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.next_bit += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:182:17
[INFO] [stderr]     |
[INFO] [stderr] 182 |                 i = i + 1;
[INFO] [stderr]     |                 ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:192:17
[INFO] [stderr]     |
[INFO] [stderr] 192 |                 i = i + 1;
[INFO] [stderr]     |                 ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:212:9
[INFO] [stderr]     |
[INFO] [stderr] 212 |         i = i + 1;
[INFO] [stderr]     |         ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:236:17
[INFO] [stderr]     |
[INFO] [stderr] 236 |                 output.write(&[value]);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:237:17
[INFO] [stderr]     |
[INFO] [stderr] 237 |                 num_written = num_written + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `num_written += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:306:5
[INFO] [stderr]     |
[INFO] [stderr] 306 |     f.seek(SeekFrom::Start(0));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:321:5
[INFO] [stderr]     |
[INFO] [stderr] 321 |     output.write_all(&list_len_buf);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:334:17
[INFO] [stderr]     |
[INFO] [stderr] 334 |                 output.write_all(&buf);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:346:36
[INFO] [stderr]     |
[INFO] [stderr] 346 |             Leaf {count, value} => size = size + count,
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^ help: replace it with: `size += count`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:353:5
[INFO] [stderr]     |
[INFO] [stderr] 353 |     output.write_all(&buf);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:437:9
[INFO] [stderr]     |
[INFO] [stderr] 437 |         i = i + 1;
[INFO] [stderr]     |         ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `left`
[INFO] [stderr]    --> src/lib.rs:171:26
[INFO] [stderr]     |
[INFO] [stderr] 171 |         Node {count, ref left, ref right} => count,
[INFO] [stderr]     |                          ^^^^ help: try ignoring the field: `left: _`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `right`
[INFO] [stderr]    --> src/lib.rs:171:36
[INFO] [stderr]     |
[INFO] [stderr] 171 |         Node {count, ref left, ref right} => count,
[INFO] [stderr]     |                                    ^^^^^ help: try ignoring the field: `right: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:172:22
[INFO] [stderr]     |
[INFO] [stderr] 172 |         Leaf {count, value} => count
[INFO] [stderr]     |                      ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:178:15
[INFO] [stderr]     |
[INFO] [stderr] 178 |         Node {count, ref left, ref right} => {
[INFO] [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:235:19
[INFO] [stderr]     |
[INFO] [stderr] 235 |             Leaf {count, value} => {
[INFO] [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:240:19
[INFO] [stderr]     |
[INFO] [stderr] 240 |             Node {count, ref left, ref right} => {
[INFO] [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `p`
[INFO] [stderr]    --> src/lib.rs:303:9
[INFO] [stderr]     |
[INFO] [stderr] 303 |     let p = 97 as u8;
[INFO] [stderr]     |         ^ help: consider using `_p` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:346:26
[INFO] [stderr]     |
[INFO] [stderr] 346 |             Leaf {count, value} => size = size + count,
[INFO] [stderr]     |                          ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:395:15
[INFO] [stderr]     |
[INFO] [stderr] 395 |         Node {count, ref left, ref right} => {
[INFO] [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `count`
[INFO] [stderr]    --> src/lib.rs:403:15
[INFO] [stderr]     |
[INFO] [stderr] 403 |         Leaf {count, value}  => {
[INFO] [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:215:9
[INFO] [stderr]     |
[INFO] [stderr] 215 |     let mut tree = make_tree(table_vec);
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:300:9
[INFO] [stderr]     |
[INFO] [stderr] 300 |     let mut tree = make_tree(v);
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:350:9
[INFO] [stderr]     |
[INFO] [stderr] 350 |     let mut buf: [u8; 8] = unsafe {
[INFO] [stderr]     |         ----^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:388:9
[INFO] [stderr]     |
[INFO] [stderr] 388 |     let mut bits = BitString::new();
[INFO] [stderr]     |         ----^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:393:29
[INFO] [stderr]     |
[INFO] [stderr] 393 | fn traverse(current: &Tree, mut bits: BitString, table: &mut HashMap<u8, BitString>) {
[INFO] [stderr]     |                             ----^^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `byte_string`
[INFO] [stderr]    --> src/lib.rs:138:1
[INFO] [stderr]     |
[INFO] [stderr] 138 | fn byte_string(data: u8, num_bits: u8) -> String {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: item `BitString` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]   --> src/lib.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | / impl BitString {
[INFO] [stderr] 32 | |     pub fn new() -> BitString {
[INFO] [stderr] 33 | |         BitString { data: Vec::new() }
[INFO] [stderr] 34 | |     }
[INFO] [stderr] ...  |
[INFO] [stderr] 66 | |     }
[INFO] [stderr] 67 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `BitString`
[INFO] [stderr]   --> src/lib.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 | /     pub fn new() -> BitString {
[INFO] [stderr] 33 | |         BitString { data: Vec::new() }
[INFO] [stderr] 34 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 27 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/lib.rs:88:13
[INFO] [stderr]    |
[INFO] [stderr] 88 |             self.next_byte = self.next_byte | (bits.get(i) << self.next_bit_index);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.next_byte |= (bits.get(i) << self.next_bit_index)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         self.output.write(&a);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:133:9
[INFO] [stderr]     |
[INFO] [stderr] 133 |         self.next_bit = self.next_bit + 1;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.next_bit += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:182:17
[INFO] [stderr]     |
[INFO] [stderr] 182 |                 i = i + 1;
[INFO] [stderr]     |                 ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:192:17
[INFO] [stderr]     |
[INFO] [stderr] 192 |                 i = i + 1;
[INFO] [stderr]     |                 ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:212:9
[INFO] [stderr]     |
[INFO] [stderr] 212 |         i = i + 1;
[INFO] [stderr]     |         ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:236:17
[INFO] [stderr]     |
[INFO] [stderr] 236 |                 output.write(&[value]);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:237:17
[INFO] [stderr]     |
[INFO] [stderr] 237 |                 num_written = num_written + 1;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `num_written += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:306:5
[INFO] [stderr]     |
[INFO] [stderr] 306 |     f.seek(SeekFrom::Start(0));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:321:5
[INFO] [stderr]     |
[INFO] [stderr] 321 |     output.write_all(&list_len_buf);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:334:17
[INFO] [stderr]     |
[INFO] [stderr] 334 |                 output.write_all(&buf);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:346:36
[INFO] [stderr]     |
[INFO] [stderr] 346 |             Leaf {count, value} => size = size + count,
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^ help: replace it with: `size += count`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/lib.rs:353:5
[INFO] [stderr]     |
[INFO] [stderr] 353 |     output.write_all(&buf);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/lib.rs:437:9
[INFO] [stderr]     |
[INFO] [stderr] 437 |         i = i + 1;
[INFO] [stderr]     |         ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.24s
[INFO] running `"docker" "inspect" "a83235dd6c85d091ed503d511382a3e4581655f71af6f9f2497d3ae509353f19"`
[INFO] running `"docker" "rm" "-f" "a83235dd6c85d091ed503d511382a3e4581655f71af6f9f2497d3ae509353f19"`
[INFO] [stdout] a83235dd6c85d091ed503d511382a3e4581655f71af6f9f2497d3ae509353f19