[INFO] cloning repository https://github.com/rdawson46/rust-huffman
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rdawson46/rust-huffman" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frdawson46%2Frust-huffman", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frdawson46%2Frust-huffman'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 979ddc70986ccc5007b2a69f81624ca08405569c
[INFO] checking rdawson46/rust-huffman against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frdawson46%2Frust-huffman" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rdawson46/rust-huffman on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rdawson46/rust-huffman
[INFO] finished tweaking git repo https://github.com/rdawson46/rust-huffman
[INFO] tweaked toml for git repo https://github.com/rdawson46/rust-huffman written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rdawson46/rust-huffman 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff47c96a54b063e8271bf56bbcf2386e3bfdfe7a29e8fa370469675eba7924f4
[INFO] running `Command { std: "docker" "start" "-a" "ff47c96a54b063e8271bf56bbcf2386e3bfdfe7a29e8fa370469675eba7924f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff47c96a54b063e8271bf56bbcf2386e3bfdfe7a29e8fa370469675eba7924f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff47c96a54b063e8271bf56bbcf2386e3bfdfe7a29e8fa370469675eba7924f4", kill_on_drop: false }`
[INFO] [stdout] ff47c96a54b063e8271bf56bbcf2386e3bfdfe7a29e8fa370469675eba7924f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c4225a4b69aa769ca87eda3fe5aa262c29d734bc89d255edab71dc111c711e32
[INFO] running `Command { std: "docker" "start" "-a" "c4225a4b69aa769ca87eda3fe5aa262c29d734bc89d255edab71dc111c711e32", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]     Checking either v1.11.0
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]     Checking rayon-core v1.12.1
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking comp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `tree`
[INFO] [stdout]   --> src/decoder.rs:30:13
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_char_paths` is never used
[INFO] [stdout]   --> src/minheap.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl MinHeap {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 95 |     pub fn get_char_paths(&self) -> HashMap<char, String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Next` is never used
[INFO] [stdout]  --> src/decoder.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | type Next = Option<Box<Node>>;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/decoder.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Node {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl Node {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new(val: Option<char>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tree` is never constructed
[INFO] [stdout]   --> src/decoder.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct Tree {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Tree {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 24 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from` is never used
[INFO] [stdout]   --> src/decoder.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tree`
[INFO] [stdout]   --> src/decoder.rs:30:13
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Next` is never used
[INFO] [stdout]  --> src/decoder.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | type Next = Option<Box<Node>>;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/decoder.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Node {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl Node {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new(val: Option<char>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tree` is never constructed
[INFO] [stdout]   --> src/decoder.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct Tree {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Tree {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 24 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from` is never used
[INFO] [stdout]   --> src/decoder.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.09s
[INFO] running `Command { std: "docker" "inspect" "c4225a4b69aa769ca87eda3fe5aa262c29d734bc89d255edab71dc111c711e32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4225a4b69aa769ca87eda3fe5aa262c29d734bc89d255edab71dc111c711e32", kill_on_drop: false }`
[INFO] [stdout] c4225a4b69aa769ca87eda3fe5aa262c29d734bc89d255edab71dc111c711e32
[INFO] checking rdawson46/rust-huffman against try#f9935d29d867449445ee008640ccca1bf1ae0889+rustflags=-Dtail_expr_drop_order for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frdawson46%2Frust-huffman" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rdawson46/rust-huffman on toolchain f9935d29d867449445ee008640ccca1bf1ae0889
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rdawson46/rust-huffman
[INFO] finished tweaking git repo https://github.com/rdawson46/rust-huffman
[INFO] tweaked toml for git repo https://github.com/rdawson46/rust-huffman written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/rdawson46/rust-huffman 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" "+f9935d29d867449445ee008640ccca1bf1ae0889" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce805769fb2cb661637d9d2cc53444f90b319e1b7e6fe8942cbb166b0cf03253
[INFO] running `Command { std: "docker" "start" "-a" "ce805769fb2cb661637d9d2cc53444f90b319e1b7e6fe8942cbb166b0cf03253", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce805769fb2cb661637d9d2cc53444f90b319e1b7e6fe8942cbb166b0cf03253", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce805769fb2cb661637d9d2cc53444f90b319e1b7e6fe8942cbb166b0cf03253", kill_on_drop: false }`
[INFO] [stdout] ce805769fb2cb661637d9d2cc53444f90b319e1b7e6fe8942cbb166b0cf03253
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dtail_expr_drop_order" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6cea21c8668e1a7532d51a4168d2fc7276adf00deac1d06fa68206ccc112fabe
[INFO] running `Command { std: "docker" "start" "-a" "6cea21c8668e1a7532d51a4168d2fc7276adf00deac1d06fa68206ccc112fabe", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]     Checking either v1.11.0
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]     Checking rayon-core v1.12.1
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking comp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `tree`
[INFO] [stdout]   --> src/decoder.rs:30:13
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_char_paths` is never used
[INFO] [stdout]   --> src/minheap.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl MinHeap {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 95 |     pub fn get_char_paths(&self) -> HashMap<char, String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Next` is never used
[INFO] [stdout]  --> src/decoder.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | type Next = Option<Box<Node>>;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/decoder.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Node {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl Node {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new(val: Option<char>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tree` is never constructed
[INFO] [stdout]   --> src/decoder.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct Tree {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Tree {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 24 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from` is never used
[INFO] [stdout]   --> src/decoder.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021
[INFO] [stdout]   --> src/minheap.rs:90:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |         let mut nodes: Vec<Box<Node>> = map.par_iter()
[INFO] [stdout]    |                 ----- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 88 |         let root = nodes.pop().unwrap();
[INFO] [stdout]    |             ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 89 |
[INFO] [stdout] 90 |         MinHeap { root: Some(root) }
[INFO] [stdout]    |                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2024
[INFO] [stdout]    = note: for more information, see issue #123739 <https://github.com/rust-lang/rust/issues/123739>
[INFO] [stdout]    = note: requested on the command line with `-D tail-expr-drop-order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `comp` (bin "comp") due to 2 previous errors; 8 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `tree`
[INFO] [stdout]   --> src/decoder.rs:30:13
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Next` is never used
[INFO] [stdout]  --> src/decoder.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | type Next = Option<Box<Node>>;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/decoder.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Node {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl Node {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 10 |     pub fn new(val: Option<char>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tree` is never constructed
[INFO] [stdout]   --> src/decoder.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct Tree {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/decoder.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Tree {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 24 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from` is never used
[INFO] [stdout]   --> src/decoder.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn from(tree: String) -> Tree {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021
[INFO] [stdout]   --> src/minheap.rs:90:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |         let mut nodes: Vec<Box<Node>> = map.par_iter()
[INFO] [stdout]    |                 ----- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 88 |         let root = nodes.pop().unwrap();
[INFO] [stdout]    |             ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 89 |
[INFO] [stdout] 90 |         MinHeap { root: Some(root) }
[INFO] [stdout]    |                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2024
[INFO] [stdout]    = note: for more information, see issue #123739 <https://github.com/rust-lang/rust/issues/123739>
[INFO] [stdout]    = note: requested on the command line with `-D tail-expr-drop-order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `comp` (bin "comp" test) due to 2 previous errors; 7 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "6cea21c8668e1a7532d51a4168d2fc7276adf00deac1d06fa68206ccc112fabe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cea21c8668e1a7532d51a4168d2fc7276adf00deac1d06fa68206ccc112fabe", kill_on_drop: false }`
[INFO] [stdout] 6cea21c8668e1a7532d51a4168d2fc7276adf00deac1d06fa68206ccc112fabe