[INFO] cloning repository https://github.com/famibo/rust-single-linked-list [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/famibo/rust-single-linked-list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffamibo%2Frust-single-linked-list", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffamibo%2Frust-single-linked-list'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 20139794963458570f7dfe05b39890b2812fb0bd [INFO] building famibo/rust-single-linked-list against try#9b5e8b16bd1c4acf4cf8e6880368314cf021a987+rustflags=-Dtail-expr-drop-order for pr-134523 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffamibo%2Frust-single-linked-list" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/famibo/rust-single-linked-list on toolchain 9b5e8b16bd1c4acf4cf8e6880368314cf021a987 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/famibo/rust-single-linked-list [INFO] finished tweaking git repo https://github.com/famibo/rust-single-linked-list [INFO] tweaked toml for git repo https://github.com/famibo/rust-single-linked-list written to /workspace/builds/worker-0-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/famibo/rust-single-linked-list 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" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] dc2de2c2a5f39f18914c8d4ec163ab5b536f5f58b49f8dfa3e65f7a07a0974d0 [INFO] running `Command { std: "docker" "start" "-a" "dc2de2c2a5f39f18914c8d4ec163ab5b536f5f58b49f8dfa3e65f7a07a0974d0", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "dc2de2c2a5f39f18914c8d4ec163ab5b536f5f58b49f8dfa3e65f7a07a0974d0", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "dc2de2c2a5f39f18914c8d4ec163ab5b536f5f58b49f8dfa3e65f7a07a0974d0", kill_on_drop: false }` [INFO] [stdout] dc2de2c2a5f39f18914c8d4ec163ab5b536f5f58b49f8dfa3e65f7a07a0974d0 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 4a1db0d9264487585471fe72a03d591d2afa407456314d28723c8c78a72f6b10 [INFO] running `Command { std: "docker" "start" "-a" "4a1db0d9264487585471fe72a03d591d2afa407456314d28723c8c78a72f6b10", kill_on_drop: false }` [INFO] [stderr] Compiling singly_linked_list v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error: a temporary value will be dropped here before the execution exits the block in Edition 2024, which will raise borrow checking error [INFO] [stdout] --> src/main.rs:27:9 [INFO] [stdout] | [INFO] [stdout] 23 | if let Some(next_item) = Rc::clone(&item).borrow().next() { [INFO] [stdout] | ---------------- consider using a `let` binding to create a longer lived value; or replacing the `{ .. }` block with curly brackets `( .. )`; or folding the rest of the expression into the surrounding `unsafe { .. }` [INFO] [stdout] ... [INFO] [stdout] 27 | } [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see [INFO] [stdout] = note: requested on the command line with `-D tail-expr-drop-order` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `data` and `next` are never read [INFO] [stdout] --> src/linked_list.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 3 | pub struct ListItem { [INFO] [stdout] | -------- fields in this struct [INFO] [stdout] 4 | data: Box, [INFO] [stdout] | ^^^^ [INFO] [stdout] 5 | next: Option>>, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `ListItem` 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/linked_list.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 9 | pub struct SinglyLinkedList { [INFO] [stdout] | ---------------- field in this struct [INFO] [stdout] 10 | head: ListItem, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `SinglyLinkedList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `next`, `data`, and `as_mut` are never used [INFO] [stdout] --> src/linked_list.rs:14:8 [INFO] [stdout] | [INFO] [stdout] 13 | impl ListItem { [INFO] [stdout] | ------------------- associated items in this implementation [INFO] [stdout] 14 | fn new(data: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 20 | pub fn next(&self) -> Option<&Self> { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 27 | pub fn data(&self) -> &T { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 30 | fn as_mut(&mut self) -> &mut Self { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `append`, `head`, and `tail` are never used [INFO] [stdout] --> src/linked_list.rs:36:12 [INFO] [stdout] | [INFO] [stdout] 35 | impl SinglyLinkedList { [INFO] [stdout] | --------------------------- associated items in this implementation [INFO] [stdout] 36 | pub fn new(data: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 41 | pub fn append(&mut self, data: T) { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 48 | pub fn head(&self) -> &ListItem { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 52 | pub fn tail(&self) -> &ListItem { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `singly_linked_list` (bin "singly_linked_list") due to 1 previous error; 4 warnings emitted [INFO] running `Command { std: "docker" "inspect" "4a1db0d9264487585471fe72a03d591d2afa407456314d28723c8c78a72f6b10", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "4a1db0d9264487585471fe72a03d591d2afa407456314d28723c8c78a72f6b10", kill_on_drop: false }` [INFO] [stdout] 4a1db0d9264487585471fe72a03d591d2afa407456314d28723c8c78a72f6b10