Dec 01 08:16:23.360 INFO testing murphym18/huffman_code against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 01 08:16:23.360 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-1/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 01 08:16:23.666 INFO [stdout] b5902aa81c318803791f670d7982f64f7a89e2dcc340883f41028f555b0adb3a
Dec 01 08:16:23.672 INFO running `"docker" "start" "-a" "b5902aa81c318803791f670d7982f64f7a89e2dcc340883f41028f555b0adb3a"`
Dec 01 08:16:24.727 INFO [stderr] usermod: no changes
Dec 01 08:16:24.776 INFO [stderr]    Compiling huffman_code v0.1.0 (/source)
Dec 01 08:16:25.095 INFO [stderr] warning: unused import: `std::io`
Dec 01 08:16:25.095 INFO [stderr]  --> src/lib.rs:1:5
Dec 01 08:16:25.095 INFO [stderr]   |
Dec 01 08:16:25.095 INFO [stderr] 1 | use std::io;
Dec 01 08:16:25.095 INFO [stderr]   |     ^^^^^^^
Dec 01 08:16:25.096 INFO [stderr]   |
Dec 01 08:16:25.096 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 01 08:16:25.096 INFO [stderr] 
Dec 01 08:16:25.096 INFO [stderr] warning: unused import: `Cursor`
Dec 01 08:16:25.096 INFO [stderr]  --> src/lib.rs:5:28
Dec 01 08:16:25.096 INFO [stderr]   |
Dec 01 08:16:25.097 INFO [stderr] 5 | use std::io::{Read, Write, Cursor};
Dec 01 08:16:25.097 INFO [stderr]   |                            ^^^^^^
Dec 01 08:16:25.097 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `left`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:171:26
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 171 |         Node {count, ref left, ref right} => count,
Dec 01 08:16:25.255 INFO [stderr]     |                          ^^^^ help: try ignoring the field: `left: _`
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `right`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:171:36
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 171 |         Node {count, ref left, ref right} => count,
Dec 01 08:16:25.255 INFO [stderr]     |                                    ^^^^^ help: try ignoring the field: `right: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `value`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:172:22
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 172 |         Leaf {count, value} => count
Dec 01 08:16:25.255 INFO [stderr]     |                      ^^^^^ help: try ignoring the field: `value: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:178:15
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 178 |         Node {count, ref left, ref right} => {
Dec 01 08:16:25.255 INFO [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:235:19
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 235 |             Leaf {count, value} => {
Dec 01 08:16:25.255 INFO [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:240:19
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 240 |             Node {count, ref left, ref right} => {
Dec 01 08:16:25.255 INFO [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `p`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:303:9
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 303 |     let p = 97 as u8;
Dec 01 08:16:25.255 INFO [stderr]     |         ^ help: consider using `_p` instead
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `value`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:346:26
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 346 |             Leaf {count, value} => size = size + count,
Dec 01 08:16:25.255 INFO [stderr]     |                          ^^^^^ help: try ignoring the field: `value: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:395:15
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 395 |         Node {count, ref left, ref right} => {
Dec 01 08:16:25.255 INFO [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.255 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:25.255 INFO [stderr]    --> src/lib.rs:403:15
Dec 01 08:16:25.255 INFO [stderr]     |
Dec 01 08:16:25.255 INFO [stderr] 403 |         Leaf {count, value}  => {
Dec 01 08:16:25.255 INFO [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:25.255 INFO [stderr] 
Dec 01 08:16:25.271 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:25.271 INFO [stderr]    --> src/lib.rs:215:9
Dec 01 08:16:25.271 INFO [stderr]     |
Dec 01 08:16:25.271 INFO [stderr] 215 |     let mut tree = make_tree(table_vec);
Dec 01 08:16:25.271 INFO [stderr]     |         ----^^^^
Dec 01 08:16:25.271 INFO [stderr]     |         |
Dec 01 08:16:25.271 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:25.271 INFO [stderr]     |
Dec 01 08:16:25.271 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 01 08:16:25.271 INFO [stderr] 
Dec 01 08:16:25.283 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:25.283 INFO [stderr]    --> src/lib.rs:300:9
Dec 01 08:16:25.283 INFO [stderr]     |
Dec 01 08:16:25.283 INFO [stderr] 300 |     let mut tree = make_tree(v);
Dec 01 08:16:25.283 INFO [stderr]     |         ----^^^^
Dec 01 08:16:25.283 INFO [stderr]     |         |
Dec 01 08:16:25.283 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:25.283 INFO [stderr] 
Dec 01 08:16:25.283 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:25.283 INFO [stderr]    --> src/lib.rs:350:9
Dec 01 08:16:25.283 INFO [stderr]     |
Dec 01 08:16:25.283 INFO [stderr] 350 |     let mut buf: [u8; 8] = unsafe {
Dec 01 08:16:25.283 INFO [stderr]     |         ----^^^
Dec 01 08:16:25.283 INFO [stderr]     |         |
Dec 01 08:16:25.283 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:25.283 INFO [stderr] 
Dec 01 08:16:25.283 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:25.283 INFO [stderr]    --> src/lib.rs:388:9
Dec 01 08:16:25.283 INFO [stderr]     |
Dec 01 08:16:25.283 INFO [stderr] 388 |     let mut bits = BitString::new();
Dec 01 08:16:25.283 INFO [stderr]     |         ----^^^^
Dec 01 08:16:25.283 INFO [stderr]     |         |
Dec 01 08:16:25.283 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:25.283 INFO [stderr] 
Dec 01 08:16:25.283 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:25.283 INFO [stderr]    --> src/lib.rs:393:29
Dec 01 08:16:25.283 INFO [stderr]     |
Dec 01 08:16:25.283 INFO [stderr] 393 | fn traverse(current: &Tree, mut bits: BitString, table: &mut HashMap<u8, BitString>) {
Dec 01 08:16:25.283 INFO [stderr]     |                             ----^^^^
Dec 01 08:16:25.283 INFO [stderr]     |                             |
Dec 01 08:16:25.283 INFO [stderr]     |                             help: remove this `mut`
Dec 01 08:16:25.283 INFO [stderr] 
Dec 01 08:16:25.291 INFO [stderr] warning: function is never used: `byte_string`
Dec 01 08:16:25.291 INFO [stderr]    --> src/lib.rs:138:1
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr] 138 | fn byte_string(data: u8, num_bits: u8) -> String {
Dec 01 08:16:25.291 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 01 08:16:25.291 INFO [stderr] 
Dec 01 08:16:25.291 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:25.291 INFO [stderr]    --> src/lib.rs:104:9
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr] 104 |         self.output.write(&a);
Dec 01 08:16:25.291 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 01 08:16:25.291 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:25.291 INFO [stderr] 
Dec 01 08:16:25.291 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:25.291 INFO [stderr]    --> src/lib.rs:236:17
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr] 236 |                 output.write(&[value]);
Dec 01 08:16:25.291 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:25.291 INFO [stderr] 
Dec 01 08:16:25.291 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:25.291 INFO [stderr]    --> src/lib.rs:306:5
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr] 306 |     f.seek(SeekFrom::Start(0));
Dec 01 08:16:25.291 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:25.291 INFO [stderr] 
Dec 01 08:16:25.291 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:25.291 INFO [stderr]    --> src/lib.rs:321:5
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr] 321 |     output.write_all(&list_len_buf);
Dec 01 08:16:25.291 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:25.291 INFO [stderr] 
Dec 01 08:16:25.291 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:25.291 INFO [stderr]    --> src/lib.rs:334:17
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr] 334 |                 output.write_all(&buf);
Dec 01 08:16:25.291 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:25.291 INFO [stderr]     |
Dec 01 08:16:25.291 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:25.291 INFO [stderr] 
Dec 01 08:16:25.292 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:25.292 INFO [stderr]    --> src/lib.rs:353:5
Dec 01 08:16:25.292 INFO [stderr]     |
Dec 01 08:16:25.292 INFO [stderr] 353 |     output.write_all(&buf);
Dec 01 08:16:25.292 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:25.292 INFO [stderr]     |
Dec 01 08:16:25.292 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:25.292 INFO [stderr] 
Dec 01 08:16:26.624 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.87s
Dec 01 08:16:26.632 INFO [stderr] su: No module specific data is present
Dec 01 08:16:27.161 INFO running `"docker" "inspect" "b5902aa81c318803791f670d7982f64f7a89e2dcc340883f41028f555b0adb3a"`
Dec 01 08:16:27.383 INFO running `"docker" "rm" "-f" "b5902aa81c318803791f670d7982f64f7a89e2dcc340883f41028f555b0adb3a"`
Dec 01 08:16:27.610 INFO [stdout] b5902aa81c318803791f670d7982f64f7a89e2dcc340883f41028f555b0adb3a
Dec 01 08:16:27.617 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-1/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 01 08:16:28.023 INFO [stdout] 1544efa7b933e732a5f5bf51582230846bf1bfc9b99a3d4c886d1614bea9cae6
Dec 01 08:16:28.024 INFO running `"docker" "start" "-a" "1544efa7b933e732a5f5bf51582230846bf1bfc9b99a3d4c886d1614bea9cae6"`
Dec 01 08:16:29.052 INFO [stderr] usermod: no changes
Dec 01 08:16:29.119 INFO [stderr]    Compiling huffman_code v0.1.0 (/source)
Dec 01 08:16:29.722 INFO [stderr] warning: unused import: `std::io`
Dec 01 08:16:29.722 INFO [stderr]  --> src/lib.rs:1:5
Dec 01 08:16:29.722 INFO [stderr]   |
Dec 01 08:16:29.722 INFO [stderr] 1 | use std::io;
Dec 01 08:16:29.722 INFO [stderr]   |     ^^^^^^^
Dec 01 08:16:29.735 INFO [stderr]   |
Dec 01 08:16:29.735 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 01 08:16:29.735 INFO [stderr] 
Dec 01 08:16:29.735 INFO [stderr] warning: unused import: `Cursor`
Dec 01 08:16:29.735 INFO [stderr]  --> src/lib.rs:5:28
Dec 01 08:16:29.735 INFO [stderr]   |
Dec 01 08:16:29.735 INFO [stderr] 5 | use std::io::{Read, Write, Cursor};
Dec 01 08:16:29.735 INFO [stderr]   |                            ^^^^^^
Dec 01 08:16:29.735 INFO [stderr] 
Dec 01 08:16:30.140 INFO [stderr] warning: unused variable: `left`
Dec 01 08:16:30.140 INFO [stderr]    --> src/lib.rs:171:26
Dec 01 08:16:30.140 INFO [stderr]     |
Dec 01 08:16:30.140 INFO [stderr] 171 |         Node {count, ref left, ref right} => count,
Dec 01 08:16:30.140 INFO [stderr]     |                          ^^^^ help: try ignoring the field: `left: _`
Dec 01 08:16:30.141 INFO [stderr]     |
Dec 01 08:16:30.141 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 01 08:16:30.141 INFO [stderr] 
Dec 01 08:16:30.141 INFO [stderr] warning: unused variable: `right`
Dec 01 08:16:30.141 INFO [stderr]    --> src/lib.rs:171:36
Dec 01 08:16:30.141 INFO [stderr]     |
Dec 01 08:16:30.142 INFO [stderr] 171 |         Node {count, ref left, ref right} => count,
Dec 01 08:16:30.142 INFO [stderr]     |                                    ^^^^^ help: try ignoring the field: `right: _`
Dec 01 08:16:30.142 INFO [stderr] 
Dec 01 08:16:30.142 INFO [stderr] warning: unused variable: `value`
Dec 01 08:16:30.142 INFO [stderr]    --> src/lib.rs:172:22
Dec 01 08:16:30.142 INFO [stderr]     |
Dec 01 08:16:30.142 INFO [stderr] 172 |         Leaf {count, value} => count
Dec 01 08:16:30.143 INFO [stderr]     |                      ^^^^^ help: try ignoring the field: `value: _`
Dec 01 08:16:30.143 INFO [stderr] 
Dec 01 08:16:30.143 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:30.143 INFO [stderr]    --> src/lib.rs:178:15
Dec 01 08:16:30.144 INFO [stderr]     |
Dec 01 08:16:30.144 INFO [stderr] 178 |         Node {count, ref left, ref right} => {
Dec 01 08:16:30.144 INFO [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:30.144 INFO [stderr] 
Dec 01 08:16:30.151 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:30.151 INFO [stderr]    --> src/lib.rs:235:19
Dec 01 08:16:30.151 INFO [stderr]     |
Dec 01 08:16:30.151 INFO [stderr] 235 |             Leaf {count, value} => {
Dec 01 08:16:30.152 INFO [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:30.152 INFO [stderr] 
Dec 01 08:16:30.152 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:30.152 INFO [stderr]    --> src/lib.rs:240:19
Dec 01 08:16:30.153 INFO [stderr]     |
Dec 01 08:16:30.153 INFO [stderr] 240 |             Node {count, ref left, ref right} => {
Dec 01 08:16:30.153 INFO [stderr]     |                   ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:30.153 INFO [stderr] 
Dec 01 08:16:30.154 INFO [stderr] warning: unused variable: `p`
Dec 01 08:16:30.154 INFO [stderr]    --> src/lib.rs:303:9
Dec 01 08:16:30.154 INFO [stderr]     |
Dec 01 08:16:30.155 INFO [stderr] 303 |     let p = 97 as u8;
Dec 01 08:16:30.155 INFO [stderr]     |         ^ help: consider using `_p` instead
Dec 01 08:16:30.155 INFO [stderr] 
Dec 01 08:16:30.155 INFO [stderr] warning: unused variable: `value`
Dec 01 08:16:30.156 INFO [stderr]    --> src/lib.rs:346:26
Dec 01 08:16:30.156 INFO [stderr]     |
Dec 01 08:16:30.156 INFO [stderr] 346 |             Leaf {count, value} => size = size + count,
Dec 01 08:16:30.156 INFO [stderr]     |                          ^^^^^ help: try ignoring the field: `value: _`
Dec 01 08:16:30.157 INFO [stderr] 
Dec 01 08:16:30.157 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:30.157 INFO [stderr]    --> src/lib.rs:395:15
Dec 01 08:16:30.157 INFO [stderr]     |
Dec 01 08:16:30.158 INFO [stderr] 395 |         Node {count, ref left, ref right} => {
Dec 01 08:16:30.158 INFO [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:30.158 INFO [stderr] 
Dec 01 08:16:30.158 INFO [stderr] warning: unused variable: `count`
Dec 01 08:16:30.159 INFO [stderr]    --> src/lib.rs:403:15
Dec 01 08:16:30.159 INFO [stderr]     |
Dec 01 08:16:30.159 INFO [stderr] 403 |         Leaf {count, value}  => {
Dec 01 08:16:30.160 INFO [stderr]     |               ^^^^^ help: try ignoring the field: `count: _`
Dec 01 08:16:30.160 INFO [stderr] 
Dec 01 08:16:30.192 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:30.193 INFO [stderr]    --> src/lib.rs:215:9
Dec 01 08:16:30.193 INFO [stderr]     |
Dec 01 08:16:30.193 INFO [stderr] 215 |     let mut tree = make_tree(table_vec);
Dec 01 08:16:30.193 INFO [stderr]     |         ----^^^^
Dec 01 08:16:30.193 INFO [stderr]     |         |
Dec 01 08:16:30.194 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:30.194 INFO [stderr]     |
Dec 01 08:16:30.194 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 01 08:16:30.195 INFO [stderr] 
Dec 01 08:16:30.215 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:30.215 INFO [stderr]    --> src/lib.rs:300:9
Dec 01 08:16:30.215 INFO [stderr]     |
Dec 01 08:16:30.215 INFO [stderr] 300 |     let mut tree = make_tree(v);
Dec 01 08:16:30.216 INFO [stderr]     |         ----^^^^
Dec 01 08:16:30.216 INFO [stderr]     |         |
Dec 01 08:16:30.216 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:30.216 INFO [stderr] 
Dec 01 08:16:30.216 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:30.216 INFO [stderr]    --> src/lib.rs:350:9
Dec 01 08:16:30.216 INFO [stderr]     |
Dec 01 08:16:30.216 INFO [stderr] 350 |     let mut buf: [u8; 8] = unsafe {
Dec 01 08:16:30.216 INFO [stderr]     |         ----^^^
Dec 01 08:16:30.216 INFO [stderr]     |         |
Dec 01 08:16:30.216 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:30.216 INFO [stderr] 
Dec 01 08:16:30.219 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:30.220 INFO [stderr]    --> src/lib.rs:388:9
Dec 01 08:16:30.220 INFO [stderr]     |
Dec 01 08:16:30.220 INFO [stderr] 388 |     let mut bits = BitString::new();
Dec 01 08:16:30.220 INFO [stderr]     |         ----^^^^
Dec 01 08:16:30.220 INFO [stderr]     |         |
Dec 01 08:16:30.220 INFO [stderr]     |         help: remove this `mut`
Dec 01 08:16:30.220 INFO [stderr] 
Dec 01 08:16:30.221 INFO [stderr] warning: variable does not need to be mutable
Dec 01 08:16:30.221 INFO [stderr]    --> src/lib.rs:393:29
Dec 01 08:16:30.221 INFO [stderr]     |
Dec 01 08:16:30.221 INFO [stderr] 393 | fn traverse(current: &Tree, mut bits: BitString, table: &mut HashMap<u8, BitString>) {
Dec 01 08:16:30.221 INFO [stderr]     |                             ----^^^^
Dec 01 08:16:30.221 INFO [stderr]     |                             |
Dec 01 08:16:30.221 INFO [stderr]     |                             help: remove this `mut`
Dec 01 08:16:30.221 INFO [stderr] 
Dec 01 08:16:30.231 INFO [stderr] warning: function is never used: `byte_string`
Dec 01 08:16:30.231 INFO [stderr]    --> src/lib.rs:138:1
Dec 01 08:16:30.231 INFO [stderr]     |
Dec 01 08:16:30.231 INFO [stderr] 138 | fn byte_string(data: u8, num_bits: u8) -> String {
Dec 01 08:16:30.231 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:30.231 INFO [stderr]     |
Dec 01 08:16:30.231 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 01 08:16:30.231 INFO [stderr] 
Dec 01 08:16:30.239 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:30.239 INFO [stderr]    --> src/lib.rs:104:9
Dec 01 08:16:30.239 INFO [stderr]     |
Dec 01 08:16:30.239 INFO [stderr] 104 |         self.output.write(&a);
Dec 01 08:16:30.239 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:30.239 INFO [stderr]     |
Dec 01 08:16:30.239 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 01 08:16:30.239 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:30.239 INFO [stderr] 
Dec 01 08:16:30.240 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:30.240 INFO [stderr]    --> src/lib.rs:236:17
Dec 01 08:16:30.240 INFO [stderr]     |
Dec 01 08:16:30.240 INFO [stderr] 236 |                 output.write(&[value]);
Dec 01 08:16:30.240 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:30.240 INFO [stderr]     |
Dec 01 08:16:30.240 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:30.240 INFO [stderr] 
Dec 01 08:16:30.241 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:30.241 INFO [stderr]    --> src/lib.rs:306:5
Dec 01 08:16:30.241 INFO [stderr]     |
Dec 01 08:16:30.241 INFO [stderr] 306 |     f.seek(SeekFrom::Start(0));
Dec 01 08:16:30.241 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:30.241 INFO [stderr]     |
Dec 01 08:16:30.241 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:30.241 INFO [stderr] 
Dec 01 08:16:30.241 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:30.241 INFO [stderr]    --> src/lib.rs:321:5
Dec 01 08:16:30.241 INFO [stderr]     |
Dec 01 08:16:30.241 INFO [stderr] 321 |     output.write_all(&list_len_buf);
Dec 01 08:16:30.241 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:30.241 INFO [stderr]     |
Dec 01 08:16:30.242 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:30.242 INFO [stderr] 
Dec 01 08:16:30.242 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:30.242 INFO [stderr]    --> src/lib.rs:334:17
Dec 01 08:16:30.242 INFO [stderr]     |
Dec 01 08:16:30.242 INFO [stderr] 334 |                 output.write_all(&buf);
Dec 01 08:16:30.242 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:30.242 INFO [stderr]     |
Dec 01 08:16:30.242 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:30.242 INFO [stderr] 
Dec 01 08:16:30.242 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 01 08:16:30.242 INFO [stderr]    --> src/lib.rs:353:5
Dec 01 08:16:30.243 INFO [stderr]     |
Dec 01 08:16:30.243 INFO [stderr] 353 |     output.write_all(&buf);
Dec 01 08:16:30.243 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 01 08:16:30.243 INFO [stderr]     |
Dec 01 08:16:30.243 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 01 08:16:30.243 INFO [stderr] 
Dec 01 08:16:31.067 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.98s
Dec 01 08:16:31.072 INFO [stderr] su: No module specific data is present
Dec 01 08:16:31.897 INFO running `"docker" "inspect" "1544efa7b933e732a5f5bf51582230846bf1bfc9b99a3d4c886d1614bea9cae6"`
Dec 01 08:16:32.189 INFO running `"docker" "rm" "-f" "1544efa7b933e732a5f5bf51582230846bf1bfc9b99a3d4c886d1614bea9cae6"`
Dec 01 08:16:32.485 INFO [stdout] 1544efa7b933e732a5f5bf51582230846bf1bfc9b99a3d4c886d1614bea9cae6
Dec 01 08:16:32.489 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-1/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 01 08:16:32.865 INFO [stdout] d310b36aee0a66eaf4975afbd7cc814e447cc3aa9ae79f7f86ac79247984f128
Dec 01 08:16:32.867 INFO running `"docker" "start" "-a" "d310b36aee0a66eaf4975afbd7cc814e447cc3aa9ae79f7f86ac79247984f128"`
Dec 01 08:16:34.442 INFO [stderr] usermod: no changes
Dec 01 08:16:34.536 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
Dec 01 08:16:34.536 INFO [stderr]      Running /target/debug/deps/huffman_code-fb10b8edb1b19d2e
Dec 01 08:16:34.536 INFO [stderr]      Running /target/debug/deps/huffman_code-0bc857bd474fcb22
Dec 01 08:16:34.536 INFO [stderr]    Doc-tests huffman_code
Dec 01 08:16:34.536 INFO [stdout] 
Dec 01 08:16:34.536 INFO [stdout] running 0 tests
Dec 01 08:16:34.536 INFO [stdout] 
Dec 01 08:16:34.536 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 01 08:16:34.536 INFO [stdout] 
Dec 01 08:16:34.536 INFO [stdout] 
Dec 01 08:16:34.536 INFO [stdout] running 0 tests
Dec 01 08:16:34.536 INFO [stdout] 
Dec 01 08:16:34.536 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 01 08:16:34.536 INFO [stdout] 
Dec 01 08:16:35.087 INFO [stdout] 
Dec 01 08:16:35.087 INFO [stdout] running 0 tests
Dec 01 08:16:35.087 INFO [stdout] 
Dec 01 08:16:35.087 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 01 08:16:35.087 INFO [stdout] 
Dec 01 08:16:35.090 INFO [stderr] su: No module specific data is present
Dec 01 08:16:35.879 INFO running `"docker" "inspect" "d310b36aee0a66eaf4975afbd7cc814e447cc3aa9ae79f7f86ac79247984f128"`
Dec 01 08:16:36.223 INFO running `"docker" "rm" "-f" "d310b36aee0a66eaf4975afbd7cc814e447cc3aa9ae79f7f86ac79247984f128"`
Dec 01 08:16:36.647 INFO [stdout] d310b36aee0a66eaf4975afbd7cc814e447cc3aa9ae79f7f86ac79247984f128
