[INFO] cloning repository https://github.com/daniel-j-anderson-dev/linked_lists_book [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/daniel-j-anderson-dev/linked_lists_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaniel-j-anderson-dev%2Flinked_lists_book", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaniel-j-anderson-dev%2Flinked_lists_book'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] df5e3098d35a90a0fabe5039f84ae0bb0c5de713 [INFO] checking daniel-j-anderson-dev/linked_lists_book against master#64b185eddaa1d7ddf5e0c024be23b9cbba6c1722 for pr-143929 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaniel-j-anderson-dev%2Flinked_lists_book" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/daniel-j-anderson-dev/linked_lists_book [INFO] finished tweaking git repo https://github.com/daniel-j-anderson-dev/linked_lists_book [INFO] tweaked toml for git repo https://github.com/daniel-j-anderson-dev/linked_lists_book written to /workspace/builds/worker-7-tc1/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/daniel-j-anderson-dev/linked_lists_book on toolchain 64b185eddaa1d7ddf5e0c024be23b9cbba6c1722 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+64b185eddaa1d7ddf5e0c024be23b9cbba6c1722" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/daniel-j-anderson-dev/linked_lists_book 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" "+64b185eddaa1d7ddf5e0c024be23b9cbba6c1722" "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-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+64b185eddaa1d7ddf5e0c024be23b9cbba6c1722" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 1003a5cc94a3ca44b658b53bb2d04aabdb1e36bdc72699db69c0af0d5bb47746 [INFO] running `Command { std: "docker" "start" "-a" "1003a5cc94a3ca44b658b53bb2d04aabdb1e36bdc72699db69c0af0d5bb47746", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "1003a5cc94a3ca44b658b53bb2d04aabdb1e36bdc72699db69c0af0d5bb47746", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1003a5cc94a3ca44b658b53bb2d04aabdb1e36bdc72699db69c0af0d5bb47746", kill_on_drop: false }` [INFO] [stdout] 1003a5cc94a3ca44b658b53bb2d04aabdb1e36bdc72699db69c0af0d5bb47746 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+64b185eddaa1d7ddf5e0c024be23b9cbba6c1722" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] a2d460a6665ac5b8548ec246838922b8ea6225fc0b9633ffa758b9f3aad7ac03 [INFO] running `Command { std: "docker" "start" "-a" "a2d460a6665ac5b8548ec246838922b8ea6225fc0b9633ffa758b9f3aad7ac03", kill_on_drop: false }` [INFO] [stderr] Checking linked_lists_book v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: struct `List` is never constructed [INFO] [stdout] --> src/first.rs:3:12 [INFO] [stdout] | [INFO] [stdout] 3 | pub struct List { [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum `Link` is never used [INFO] [stdout] --> src/first.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | enum Link { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Node` is never constructed [INFO] [stdout] --> src/first.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | struct Node { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used [INFO] [stdout] --> src/first.rs:18:18 [INFO] [stdout] | [INFO] [stdout] 17 | impl List { [INFO] [stdout] | --------------- associated items in this implementation [INFO] [stdout] 18 | pub const fn new() -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 22 | pub fn push(&mut self, element: E) { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 36 | pub fn pop(&mut self) -> Option { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `List` is never constructed [INFO] [stdout] --> src/second.rs:3:12 [INFO] [stdout] | [INFO] [stdout] 3 | pub struct List { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: type alias `Link` is never used [INFO] [stdout] --> src/second.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | type Link = Option>>; [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Node` is never constructed [INFO] [stdout] --> src/second.rs:9:8 [INFO] [stdout] | [INFO] [stdout] 9 | struct Node { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `push`, `pop`, `peek`, and `peek_mut` are never used [INFO] [stdout] --> src/second.rs:15:18 [INFO] [stdout] | [INFO] [stdout] 14 | impl List { [INFO] [stdout] | --------------- associated items in this implementation [INFO] [stdout] 15 | pub const fn new() -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 19 | pub fn push(&mut self, element: E) { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 26 | pub fn pop(&mut self) -> Option { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 33 | pub fn peek(&self) -> Option<&E> { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 36 | pub fn peek_mut(&mut self) -> Option<&mut E> { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `iter` and `iter_mut` are never used [INFO] [stdout] --> src/second/iter.rs:12:12 [INFO] [stdout] | [INFO] [stdout] 11 | impl List { [INFO] [stdout] | --------------- methods in this implementation [INFO] [stdout] 12 | pub fn iter(&self) -> ReferenceIterator<'_, E> { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 15 | pub fn iter_mut(&mut self) -> MutableReferenceIterator { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `ValueIterator` is never constructed [INFO] [stdout] --> src/second/iter.rs:20:12 [INFO] [stdout] | [INFO] [stdout] 20 | pub struct ValueIterator(List); [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `ReferenceIterator` is never constructed [INFO] [stdout] --> src/second/iter.rs:28:12 [INFO] [stdout] | [INFO] [stdout] 28 | pub struct ReferenceIterator<'a, E> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `MutableReferenceIterator` is never constructed [INFO] [stdout] --> src/second/iter.rs:43:12 [INFO] [stdout] | [INFO] [stdout] 43 | pub struct MutableReferenceIterator<'a, E> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing [INFO] [stdout] --> src/second/iter.rs:15:21 [INFO] [stdout] | [INFO] [stdout] 15 | pub fn iter_mut(&mut self) -> MutableReferenceIterator { [INFO] [stdout] | ^^^^^^^^^ --------------------------- the lifetime gets resolved as `'_` [INFO] [stdout] | | [INFO] [stdout] | this lifetime flows to the output [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default [INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths [INFO] [stdout] | [INFO] [stdout] 15 | pub fn iter_mut(&mut self) -> MutableReferenceIterator<'_, E> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing [INFO] [stdout] --> src/second/iter.rs:15:21 [INFO] [stdout] | [INFO] [stdout] 15 | pub fn iter_mut(&mut self) -> MutableReferenceIterator { [INFO] [stdout] | ^^^^^^^^^ --------------------------- the lifetime gets resolved as `'_` [INFO] [stdout] | | [INFO] [stdout] | this lifetime flows to the output [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default [INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths [INFO] [stdout] | [INFO] [stdout] 15 | pub fn iter_mut(&mut self) -> MutableReferenceIterator<'_, E> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s [INFO] running `Command { std: "docker" "inspect" "a2d460a6665ac5b8548ec246838922b8ea6225fc0b9633ffa758b9f3aad7ac03", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a2d460a6665ac5b8548ec246838922b8ea6225fc0b9633ffa758b9f3aad7ac03", kill_on_drop: false }` [INFO] [stdout] a2d460a6665ac5b8548ec246838922b8ea6225fc0b9633ffa758b9f3aad7ac03