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[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bekyiu/rust-linklist" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbekyiu%2Frust-linklist", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbekyiu%2Frust-linklist'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9dbfc255aeaaa5e1fc3a379a74479a732c0fd4b2
[INFO] checking bekyiu/rust-linklist/9dbfc255aeaaa5e1fc3a379a74479a732c0fd4b2 against try#4d98531622e1718ae0bc3c7a1ab9cd8938428452+rustflags=-Dtail_expr_drop_order for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbekyiu%2Frust-linklist" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bekyiu/rust-linklist on toolchain 4d98531622e1718ae0bc3c7a1ab9cd8938428452
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
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[INFO] crate git repo https://github.com/bekyiu/rust-linklist 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" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "b7effcab1d9e2f47dc209a53c08ec03176463f8cb0703dcf64ae09f3592e7e76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7effcab1d9e2f47dc209a53c08ec03176463f8cb0703dcf64ae09f3592e7e76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7effcab1d9e2f47dc209a53c08ec03176463f8cb0703dcf64ae09f3592e7e76", kill_on_drop: false }`
[INFO] [stdout] b7effcab1d9e2f47dc209a53c08ec03176463f8cb0703dcf64ae09f3592e7e76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8c378867ac505e87274d3ed64fcc15a605cbb5fe3f8caf9ad3fd5f6a44c3aca5
[INFO] running `Command { std: "docker" "start" "-a" "8c378867ac505e87274d3ed64fcc15a605cbb5fe3f8caf9ad3fd5f6a44c3aca5", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-linklist v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/list1.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Elem(i32, Box<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Elem((), ()),
[INFO] [stdout]   |          ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/bin/list8.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Node<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Link` is never used
[INFO] [stdout]  --> src/bin/list8.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | type Link<T> = Option<Rc<Node<T>>>;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]   --> src/bin/list8.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct List<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push_left`, `pop_left`, and `peek_left` are never used
[INFO] [stdout]   --> src/bin/list8.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 17 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |     fn push_left(&self, elem: T) -> List<T> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn pop_left(&self) -> List<T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 |     fn peek_left(&self) -> Option<&T> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Iter` is never constructed
[INFO] [stdout]   --> src/bin/list8.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Iter<'a, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `iter` is never used
[INFO] [stdout]   --> src/bin/list8.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | impl<T> List<T> {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 79 |     fn iter(&self) -> Iter<T> {
[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/bin/list8.rs:47:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn push_left(&self, elem: T) -> List<T> {
[INFO] [stdout]    |                         ------- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 41 |         let node = Node {
[INFO] [stdout]    |             ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 47 |             head: Some(Rc::new(node)),
[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; 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-linklist` (bin "list8") due to 2 previous errors; 6 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/bin/list4.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Link` is never used
[INFO] [stdout]  --> src/bin/list4.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | type Link = Option<Box<Node>>;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]   --> src/bin/list4.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct List {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push_left`, and `pop_left` are never used
[INFO] [stdout]   --> src/bin/list4.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl List {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 16 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn push_left(&mut self, value: i32) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn pop_left(&mut self) -> Option<i32> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/bin/list3.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Link` is never used
[INFO] [stdout]   --> src/bin/list3.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum Link {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]   --> src/bin/list3.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct List {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push_left`, and `pop_left` are never used
[INFO] [stdout]   --> src/bin/list3.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl List {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 21 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn push_left(&mut self, value: i32) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     fn pop_left(&mut self) -> Option<i32> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/bin/list1.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Elem(i32, Box<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Elem((), ()),
[INFO] [stdout]   |          ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `elem` and `next` are never read
[INFO] [stdout]  --> src/bin/list7.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Node<T> {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     elem: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     next: Link<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]   --> src/bin/list7.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | struct List<T> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 43 |     head: Link<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[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/bin/list9.rs:31:17
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn new(value: T) -> Rc<RefCell<Node<T>>> {
[INFO] [stdout]    |            -------- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 25 |         let node = Node {
[INFO] [stdout]    |             ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 31 |         Rc::new(RefCell::new(node))
[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] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `elem` and `next` are never read
[INFO] [stdout]  --> src/bin/list2.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     elem: i32,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 4 |     next: Link,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/list2.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 |     More(Box<Node>),
[INFO] [stdout]    |     ---- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Link` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 10 |     More(()),
[INFO] [stdout]    |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]   --> src/bin/list2.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct List {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 15 |     head: Link,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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/bin/list9.rs:61:15
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn push_right(&mut self, elem: T) {
[INFO] [stdout]    |                              ------- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 60 |         let new_tail = Node::new(elem);
[INFO] [stdout]    |             -------- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 61 |         match self.tail.take() {
[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] 
[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/bin/list9.rs:93:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |         first.map(|old_head| {
[INFO] [stdout]    |                    -------- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 91 |             let node = Rc::try_unwrap(old_head).ok().unwrap();
[INFO] [stdout]    |                 ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 92 |             // into_inner消耗掉RefCell, 拿到T
[INFO] [stdout] 93 |             node.into_inner().elem
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `elem` and `next` are never read
[INFO] [stdout]  --> src/bin/list2.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     elem: i32,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 4 |     next: Link,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/list2.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 |     More(Box<Node>),
[INFO] [stdout]    |     ---- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Link` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 10 |     More(()),
[INFO] [stdout]    |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]   --> src/bin/list2.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct List {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 15 |     head: Link,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `elem` and `next` are never read
[INFO] [stdout]  --> src/bin/list7.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Node<T> {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     elem: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     next: Link<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]   --> src/bin/list7.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | struct List<T> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 43 |     head: Link<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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/bin/list9.rs:108:13
[INFO] [stdout]     |
[INFO] [stdout] 98  |         self.tail.take().map(|old_tail| {
[INFO] [stdout]     |                               -------- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 108 |             Rc::try_unwrap(old_tail).ok().unwrap().into_inner().elem
[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] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-linklist` (bin "list9" test) due to 5 previous errors
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/bin/list6.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Node<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Link` is never used
[INFO] [stdout]  --> src/bin/list6.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | type Link<T> = Option<Box<Node<T>>>;
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]   --> src/bin/list6.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct List<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push_left`, `pop_left`, `peek_left`, and `peek_left_mut` are never used
[INFO] [stdout]   --> src/bin/list6.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 15 |     fn new() -> Self <> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn push_left(&mut self, value: T) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn pop_left(&mut self) -> Option<T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn peek_left(&self) -> Option<&T> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn peek_left_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IntoIter` is never constructed
[INFO] [stdout]   --> src/bin/list6.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 | struct IntoIter<T>(List<T>);
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `into_iter` is never used
[INFO] [stdout]   --> src/bin/list6.rs:77:12
[INFO] [stdout]    |
[INFO] [stdout] 76 | impl<T> List<T> {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 77 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Iter` is never constructed
[INFO] [stdout]   --> src/bin/list6.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Iter<'a, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `iter` is never used
[INFO] [stdout]    --> src/bin/list6.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 98  | impl<T> List<T> {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 101 |     fn iter(&self) -> Iter<T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IterMut` is never constructed
[INFO] [stdout]    --> src/bin/list6.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 126 | struct IterMut<'a, T> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `iter_mut` is never used
[INFO] [stdout]    --> src/bin/list6.rs:132:8
[INFO] [stdout]     |
[INFO] [stdout] 131 | impl<T> List<T> {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] 132 |     fn iter_mut(&mut self) -> IterMut<T> {
[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/bin/list8.rs:47:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn push_left(&self, elem: T) -> List<T> {
[INFO] [stdout]    |                         ------- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 41 |         let node = Node {
[INFO] [stdout]    |             ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] ...
[INFO] [stdout] 47 |             head: Some(Rc::new(node)),
[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] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-linklist` (bin "list8" test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "8c378867ac505e87274d3ed64fcc15a605cbb5fe3f8caf9ad3fd5f6a44c3aca5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c378867ac505e87274d3ed64fcc15a605cbb5fe3f8caf9ad3fd5f6a44c3aca5", kill_on_drop: false }`
[INFO] [stdout] 8c378867ac505e87274d3ed64fcc15a605cbb5fe3f8caf9ad3fd5f6a44c3aca5