[INFO] cloning repository https://github.com/AlexisInsMu/huffman_coder
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AlexisInsMu/huffman_coder" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexisInsMu%2Fhuffman_coder", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexisInsMu%2Fhuffman_coder'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e1e3092d77f3c16a29191b9689c351f5a853834b
[INFO] testing AlexisInsMu/huffman_coder against try#b8e88e5ddf5521a9f43ee3f62a702388c713e4bb for pr-155114
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlexisInsMu%2Fhuffman_coder" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/AlexisInsMu/huffman_coder
[INFO] finished tweaking git repo https://github.com/AlexisInsMu/huffman_coder
[INFO] tweaked toml for git repo https://github.com/AlexisInsMu/huffman_coder written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/AlexisInsMu/huffman_coder on toolchain b8e88e5ddf5521a9f43ee3f62a702388c713e4bb
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b8e88e5ddf5521a9f43ee3f62a702388c713e4bb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/AlexisInsMu/huffman_coder 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" "+b8e88e5ddf5521a9f43ee3f62a702388c713e4bb" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+b8e88e5ddf5521a9f43ee3f62a702388c713e4bb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24dea41e74f0c3a080cf77eeedac7a6295d0426bf2dae55d10aae0f2e34b7184
[INFO] running `Command { std: "docker" "start" "-a" "24dea41e74f0c3a080cf77eeedac7a6295d0426bf2dae55d10aae0f2e34b7184", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24dea41e74f0c3a080cf77eeedac7a6295d0426bf2dae55d10aae0f2e34b7184", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24dea41e74f0c3a080cf77eeedac7a6295d0426bf2dae55d10aae0f2e34b7184", kill_on_drop: false }`
[INFO] [stdout] 24dea41e74f0c3a080cf77eeedac7a6295d0426bf2dae55d10aae0f2e34b7184
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+b8e88e5ddf5521a9f43ee3f62a702388c713e4bb" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd16cde1ba62893b6014d1b492446d1e1f9331b885708a918cd946811722da16
[INFO] running `Command { std: "docker" "start" "-a" "fd16cde1ba62893b6014d1b492446d1e1f9331b885708a918cd946811722da16", kill_on_drop: false }`
[INFO] [stderr]    Compiling huffman_coder v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `codes`
[INFO] [stdout]    --> src/lib.rs:107:10
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_codes`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chars`
[INFO] [stdout]    --> src/lib.rs:107:18
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stdout]     |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/lib.rs:156:12
[INFO] [stdout]     |
[INFO] [stdout] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file_name`
[INFO] [stdout]    --> src/lib.rs:126:28
[INFO] [stdout]     |
[INFO] [stdout] 126 | pub fn encode(input: &str, file_name: String) -> i64 {
[INFO] [stdout]     |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_file_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iscorrect`
[INFO] [stdout]    --> src/lib.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stdout]     |                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_iscorrect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `deserialize` is never used
[INFO] [stdout]   --> src/lib.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Node{
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn deserialize(buffer: &mut &[u8]) -> Option<Box<Node>> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `load_tree_and_text_from_file` is never used
[INFO] [stdout]    --> src/lib.rs:180:4
[INFO] [stdout]     |
[INFO] [stdout] 180 | fn load_tree_and_text_from_file(file_name: &str) -> Result<(Option<Box<Node>>, String)> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.37s
[INFO] running `Command { std: "docker" "inspect" "fd16cde1ba62893b6014d1b492446d1e1f9331b885708a918cd946811722da16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd16cde1ba62893b6014d1b492446d1e1f9331b885708a918cd946811722da16", kill_on_drop: false }`
[INFO] [stdout] fd16cde1ba62893b6014d1b492446d1e1f9331b885708a918cd946811722da16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+b8e88e5ddf5521a9f43ee3f62a702388c713e4bb" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c47022c4e463e18901bc5f03ac8c0c1b119c9ef40be13971792b2ec0d592571d
[INFO] running `Command { std: "docker" "start" "-a" "c47022c4e463e18901bc5f03ac8c0c1b119c9ef40be13971792b2ec0d592571d", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `codes`
[INFO] [stdout]    --> src/lib.rs:107:10
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_codes`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chars`
[INFO] [stdout]    --> src/lib.rs:107:18
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stdout]     |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/lib.rs:156:12
[INFO] [stdout]     |
[INFO] [stdout] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file_name`
[INFO] [stdout]    --> src/lib.rs:126:28
[INFO] [stdout]     |
[INFO] [stdout] 126 | pub fn encode(input: &str, file_name: String) -> i64 {
[INFO] [stdout]     |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_file_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iscorrect`
[INFO] [stdout]    --> src/lib.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stdout]     |                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_iscorrect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `deserialize` is never used
[INFO] [stdout]   --> src/lib.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Node{
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn deserialize(buffer: &mut &[u8]) -> Option<Box<Node>> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `load_tree_and_text_from_file` is never used
[INFO] [stdout]    --> src/lib.rs:180:4
[INFO] [stdout]     |
[INFO] [stdout] 180 | fn load_tree_and_text_from_file(file_name: &str) -> Result<(Option<Box<Node>>, String)> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling huffman_coder v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `codes`
[INFO] [stdout]    --> src/lib.rs:107:10
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stdout]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_codes`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chars`
[INFO] [stdout]    --> src/lib.rs:107:18
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stdout]     |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/lib.rs:156:12
[INFO] [stdout]     |
[INFO] [stdout] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file_name`
[INFO] [stdout]    --> src/lib.rs:126:28
[INFO] [stdout]     |
[INFO] [stdout] 126 | pub fn encode(input: &str, file_name: String) -> i64 {
[INFO] [stdout]     |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_file_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iscorrect`
[INFO] [stdout]    --> src/lib.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stdout]     |                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_iscorrect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `Command { std: "docker" "inspect" "c47022c4e463e18901bc5f03ac8c0c1b119c9ef40be13971792b2ec0d592571d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c47022c4e463e18901bc5f03ac8c0c1b119c9ef40be13971792b2ec0d592571d", kill_on_drop: false }`
[INFO] [stdout] c47022c4e463e18901bc5f03ac8c0c1b119c9ef40be13971792b2ec0d592571d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+b8e88e5ddf5521a9f43ee3f62a702388c713e4bb" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 773a71d28409d97b6de056a39996796e513a476c4fbc4eefc839abf14582c516
[INFO] running `Command { std: "docker" "start" "-a" "773a71d28409d97b6de056a39996796e513a476c4fbc4eefc839abf14582c516", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `codes`
[INFO] [stderr]    --> src/lib.rs:107:10
[INFO] [stderr]     |
[INFO] [stderr] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stderr]     |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_codes`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `chars`
[INFO] [stderr]    --> src/lib.rs:107:18
[INFO] [stderr]     |
[INFO] [stderr] 107 |     let (codes , chars): (Vec<String>, Vec<char>);
[INFO] [stderr]     |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stderr] 
[INFO] [stderr] warning: irrefutable `if let` pattern
[INFO] [stderr]    --> src/lib.rs:156:12
[INFO] [stderr]     |
[INFO] [stderr] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stderr]     = help: consider replacing the `if let` with a `let`
[INFO] [stderr]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file_name`
[INFO] [stderr]    --> src/lib.rs:126:28
[INFO] [stderr]     |
[INFO] [stderr] 126 | pub fn encode(input: &str, file_name: String) -> i64 {
[INFO] [stderr]     |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_file_name`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `iscorrect`
[INFO] [stderr]    --> src/lib.rs:156:16
[INFO] [stderr]     |
[INFO] [stderr] 156 |         if let iscorrect = save_file(&main_node, result, "output.bin".to_string().as_str()){
[INFO] [stderr]     |                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_iscorrect`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `deserialize` is never used
[INFO] [stderr]   --> src/lib.rs:48:12
[INFO] [stderr]    |
[INFO] [stderr] 15 | impl Node{
[INFO] [stderr]    | --------- associated function in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 48 |     pub fn deserialize(buffer: &mut &[u8]) -> Option<Box<Node>> {
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `load_tree_and_text_from_file` is never used
[INFO] [stderr]    --> src/lib.rs:180:4
[INFO] [stderr]     |
[INFO] [stderr] 180 | fn load_tree_and_text_from_file(file_name: &str) -> Result<(Option<Box<Node>>, String)> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `huffman_coder` (lib) generated 7 warnings (run `cargo fix --lib -p huffman_coder` to apply 4 suggestions)
[INFO] [stderr] warning: `huffman_coder` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/huffman_coder-4807896820cddab6)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::test_encode ... ok
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] test tests::test_save_and_load_tree ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tests::test_save_and_load_tree stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'tests::test_save_and_load_tree' (19) panicked at src/lib.rs:233:56:
[INFO] [stdout] called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: ReadOnlyFilesystem, message: "Read-only file system" }
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x579251890e2a - std[fce30c26ee6459b]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x579251890e2a - std[fce30c26ee6459b]::backtrace_rs::backtrace::trace_unsynchronized::<std[fce30c26ee6459b]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x579251890e2a - std[fce30c26ee6459b]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x579251890e2a - <<std[fce30c26ee6459b]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[d17f6591d688f3bd]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5792518a4d7a - <core[d17f6591d688f3bd]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5792518a4d7a - core[d17f6591d688f3bd]::fmt::write
[INFO] [stdout]    6:     0x579251895662 - std[fce30c26ee6459b]::io::default_write_fmt::<alloc[dad09f3a48280dba]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/io/mod.rs:621:11
[INFO] [stdout]    7:     0x579251895662 - <alloc[dad09f3a48280dba]::vec::Vec<u8> as std[fce30c26ee6459b]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/io/mod.rs:1976:13
[INFO] [stdout]    8:     0x57925186fc9f - <std[fce30c26ee6459b]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x57925186fc9f - std[fce30c26ee6459b]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x579251889219 - std[fce30c26ee6459b]::panicking::default_hook
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x57925182589c - <alloc[dad09f3a48280dba]::boxed::Box<dyn for<'a, 'b> core[d17f6591d688f3bd]::ops::function::Fn<(&'a std[fce30c26ee6459b]::panic::PanicHookInfo<'b>,), Output = ()> + core[d17f6591d688f3bd]::marker::Sync + core[d17f6591d688f3bd]::marker::Send> as core[d17f6591d688f3bd]::ops::function::Fn<(&std[fce30c26ee6459b]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/alloc/src/boxed.rs:2285:9
[INFO] [stdout]   12:     0x57925182589c - test[9653f4f1d2ca1489]::test_main_inner::<test[9653f4f1d2ca1489]::test_main_static::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/test/src/lib.rs:155:21
[INFO] [stdout]   13:     0x5792518893d2 - <alloc[dad09f3a48280dba]::boxed::Box<dyn for<'a, 'b> core[d17f6591d688f3bd]::ops::function::Fn<(&'a std[fce30c26ee6459b]::panic::PanicHookInfo<'b>,), Output = ()> + core[d17f6591d688f3bd]::marker::Sync + core[d17f6591d688f3bd]::marker::Send> as core[d17f6591d688f3bd]::ops::function::Fn<(&std[fce30c26ee6459b]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/alloc/src/boxed.rs:2285:9
[INFO] [stdout]   14:     0x5792518893d2 - std[fce30c26ee6459b]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x57925186fd58 - std[fce30c26ee6459b]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x579251864f69 - std[fce30c26ee6459b]::sys::backtrace::__rust_end_short_backtrace::<std[fce30c26ee6459b]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x579251870a6d - __rustc[de152adb51f02556]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5792518a54cc - core[d17f6591d688f3bd]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5792518a5242 - core[d17f6591d688f3bd]::result::unwrap_failed
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/result.rs:1867:5
[INFO] [stdout]   20:     0x579251814f01 - <core[d17f6591d688f3bd]::result::Result<(), std[fce30c26ee6459b]::io::error::Error>>::unwrap
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/result.rs:1233:23
[INFO] [stdout]   21:     0x579251814f01 - huffman_coder[719c8f73d0b7abf9]::tests::test_save_and_load_tree
[INFO] [stdout]                                at /opt/rustwide/workdir/src/lib.rs:233:56
[INFO] [stdout]   22:     0x579251810587 - huffman_coder[719c8f73d0b7abf9]::tests::test_save_and_load_tree::{closure#0}
[INFO] [stdout]                                at /opt/rustwide/workdir/src/lib.rs:226:33
[INFO] [stdout]   23:     0x579251818496 - <huffman_coder[719c8f73d0b7abf9]::tests::test_save_and_load_tree::{closure#0} as core[d17f6591d688f3bd]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x579251818b7b - <fn() -> core[d17f6591d688f3bd]::result::Result<(), alloc[dad09f3a48280dba]::string::String> as core[d17f6591d688f3bd]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x579251818b7b - test[9653f4f1d2ca1489]::__rust_begin_short_backtrace::<core[d17f6591d688f3bd]::result::Result<(), alloc[dad09f3a48280dba]::string::String>, fn() -> core[d17f6591d688f3bd]::result::Result<(), alloc[dad09f3a48280dba]::string::String>>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/test/src/lib.rs:724:18
[INFO] [stdout]   26:     0x57925182636b - test[9653f4f1d2ca1489]::run_test_in_process::{closure#0}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/test/src/lib.rs:747:74
[INFO] [stdout]   27:     0x57925182636b - <core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<test[9653f4f1d2ca1489]::run_test_in_process::{closure#0}> as core[d17f6591d688f3bd]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/panic/unwind_safe.rs:275:9
[INFO] [stdout]   28:     0x57925182636b - std[fce30c26ee6459b]::panicking::catch_unwind::do_call::<core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<test[9653f4f1d2ca1489]::run_test_in_process::{closure#0}>, core[d17f6591d688f3bd]::result::Result<(), alloc[dad09f3a48280dba]::string::String>>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x57925182636b - std[fce30c26ee6459b]::panicking::catch_unwind::<core[d17f6591d688f3bd]::result::Result<(), alloc[dad09f3a48280dba]::string::String>, core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<test[9653f4f1d2ca1489]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x57925182636b - std[fce30c26ee6459b]::panic::catch_unwind::<core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<test[9653f4f1d2ca1489]::run_test_in_process::{closure#0}>, core[d17f6591d688f3bd]::result::Result<(), alloc[dad09f3a48280dba]::string::String>>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x57925182636b - test[9653f4f1d2ca1489]::run_test_in_process
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/test/src/lib.rs:747:27
[INFO] [stdout]   32:     0x57925182636b - test[9653f4f1d2ca1489]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/test/src/lib.rs:668:43
[INFO] [stdout]   33:     0x57925181fa84 - test[9653f4f1d2ca1489]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/test/src/lib.rs:698:41
[INFO] [stdout]   34:     0x57925181fa84 - std[fce30c26ee6459b]::sys::backtrace::__rust_begin_short_backtrace::<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x579251828f72 - std[fce30c26ee6459b]::thread::lifecycle::spawn_unchecked::<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/thread/lifecycle.rs:70:13
[INFO] [stdout]   36:     0x579251828f72 - <core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<std[fce30c26ee6459b]::thread::lifecycle::spawn_unchecked<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[d17f6591d688f3bd]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/panic/unwind_safe.rs:275:9
[INFO] [stdout]   37:     0x579251828f72 - std[fce30c26ee6459b]::panicking::catch_unwind::do_call::<core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<std[fce30c26ee6459b]::thread::lifecycle::spawn_unchecked<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x579251828f72 - std[fce30c26ee6459b]::panicking::catch_unwind::<(), core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<std[fce30c26ee6459b]::thread::lifecycle::spawn_unchecked<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x579251828f72 - std[fce30c26ee6459b]::panic::catch_unwind::<core[d17f6591d688f3bd]::panic::unwind_safe::AssertUnwindSafe<std[fce30c26ee6459b]::thread::lifecycle::spawn_unchecked<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x579251828f72 - std[fce30c26ee6459b]::thread::lifecycle::spawn_unchecked::<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/thread/lifecycle.rs:68:26
[INFO] [stdout]   41:     0x579251828f72 - <std[fce30c26ee6459b]::thread::lifecycle::spawn_unchecked<test[9653f4f1d2ca1489]::run_test::{closure#1}, ()>::{closure#1} as core[d17f6591d688f3bd]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x57925189073f - <alloc[dad09f3a48280dba]::boxed::Box<dyn core[d17f6591d688f3bd]::ops::function::FnOnce<(), Output = ()> + core[d17f6591d688f3bd]::marker::Send> as core[d17f6591d688f3bd]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/alloc/src/boxed.rs:2271:9
[INFO] [stdout]   43:     0x57925189073f - <std[fce30c26ee6459b]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/b8e88e5ddf5521a9f43ee3f62a702388c713e4bb/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   44:     0x70100d366aa4 - <unknown>
[INFO] [stdout]   45:     0x70100d3f3a64 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tests::test_save_and_load_tree
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 2 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--lib`
[INFO] running `Command { std: "docker" "inspect" "773a71d28409d97b6de056a39996796e513a476c4fbc4eefc839abf14582c516", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "773a71d28409d97b6de056a39996796e513a476c4fbc4eefc839abf14582c516", kill_on_drop: false }`
[INFO] [stdout] 773a71d28409d97b6de056a39996796e513a476c4fbc4eefc839abf14582c516
