[INFO] cloning repository https://github.com/arashout/rust_linkedlist [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arashout/rust_linkedlist" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farashout%2Frust_linkedlist", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farashout%2Frust_linkedlist'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 1e6015ad0ec7684f3091ed0f40001734934354c9 [INFO] checking arashout/rust_linkedlist/1e6015ad0ec7684f3091ed0f40001734934354c9 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farashout%2Frust_linkedlist" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/arashout/rust_linkedlist on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/arashout/rust_linkedlist [INFO] finished tweaking git repo https://github.com/arashout/rust_linkedlist [INFO] tweaked toml for git repo https://github.com/arashout/rust_linkedlist written to /workspace/builds/worker-0-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/arashout/rust_linkedlist 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 41172baa4b93a8bc882d80e97c88f24a2adafe7114e7d7275fe871dc4f31f97e [INFO] running `Command { std: "docker" "start" "-a" "41172baa4b93a8bc882d80e97c88f24a2adafe7114e7d7275fe871dc4f31f97e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "41172baa4b93a8bc882d80e97c88f24a2adafe7114e7d7275fe871dc4f31f97e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "41172baa4b93a8bc882d80e97c88f24a2adafe7114e7d7275fe871dc4f31f97e", kill_on_drop: false }` [INFO] [stdout] 41172baa4b93a8bc882d80e97c88f24a2adafe7114e7d7275fe871dc4f31f97e [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] caa62b126cd3783e058070cbbb67353bed8b4e5f0f80eb3f801909657c18c936 [INFO] running `Command { std: "docker" "start" "-a" "caa62b126cd3783e058070cbbb67353bed8b4e5f0f80eb3f801909657c18c936", kill_on_drop: false }` [INFO] [stderr] Checking linkedlist v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `old_tail` [INFO] [stdout] --> src/fourth.rs:67:18 [INFO] [stdout] | [INFO] [stdout] 67 | Some(old_tail) => { [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_old_tail` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant `More` is never constructed [INFO] [stdout] --> src/first.rs:11:5 [INFO] [stdout] | [INFO] [stdout] 9 | enum Link { [INFO] [stdout] | ---- variant in this enum [INFO] [stdout] 10 | Empty, [INFO] [stdout] 11 | More(Box), [INFO] [stdout] | ^^^^ [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] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `elem` is never read [INFO] [stdout] --> src/first.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 15 | struct Node { [INFO] [stdout] | ---- field in this struct [INFO] [stdout] 16 | elem: i32, [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] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used [INFO] [stdout] --> src/first.rs:21:12 [INFO] [stdout] | [INFO] [stdout] 20 | impl List { [INFO] [stdout] | --------- associated items in this implementation [INFO] [stdout] 21 | pub fn new()-> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 25 | pub fn push(&mut self, elem: i32) { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 33 | pub fn pop(&mut self) -> Option { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `push`, `peek`, and `peek_mut` are never used [INFO] [stdout] --> src/second.rs:13:12 [INFO] [stdout] | [INFO] [stdout] 12 | impl List { [INFO] [stdout] | --------------- associated items in this implementation [INFO] [stdout] 13 | pub fn new() -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 17 | pub fn push(&mut self, elem: T) { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 33 | pub fn peek(&self) -> Option<&T> { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 37 | pub fn peek_mut(&mut self) -> Option<&mut T> { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `into_iter` is never used [INFO] [stdout] --> src/second.rs:52:12 [INFO] [stdout] | [INFO] [stdout] 51 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] 52 | pub fn into_iter(self) -> IntoIter { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `iter` is never used [INFO] [stdout] --> src/second.rs:70:12 [INFO] [stdout] | [INFO] [stdout] 69 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] 70 | pub fn iter<'a>(&'a self) -> Iter<'a, T> { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `iter_mut` is never used [INFO] [stdout] --> src/second.rs:92:12 [INFO] [stdout] | [INFO] [stdout] 91 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] 92 | pub fn iter_mut(&mut self) -> IterMut<'_, T> { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `append`, `tail`, and `head` are never used [INFO] [stdout] --> src/third.rs:15:12 [INFO] [stdout] | [INFO] [stdout] 14 | impl List { [INFO] [stdout] | --------------- associated items in this implementation [INFO] [stdout] 15 | pub fn new() -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 18 | pub fn append(&self, elem: T) -> List { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 26 | pub fn tail(&self) -> List { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 31 | pub fn head(&self) -> Option<&T> { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `iter` is never used [INFO] [stdout] --> src/third.rs:41:12 [INFO] [stdout] | [INFO] [stdout] 40 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] 41 | pub fn iter(&self) -> Iter<'_, T> { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function `new` is never used [INFO] [stdout] --> src/fourth.rs:18:8 [INFO] [stdout] | [INFO] [stdout] 17 | impl Node { [INFO] [stdout] | --------------- associated function in this implementation [INFO] [stdout] 18 | fn new(elem: T) -> Rc> { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `push_front`, `push_back`, and `peek_front` are never used [INFO] [stdout] --> src/fourth.rs:28:12 [INFO] [stdout] | [INFO] [stdout] 27 | impl List { [INFO] [stdout] | --------------- associated items in this implementation [INFO] [stdout] 28 | pub fn new() -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 34 | pub fn push_front(&mut self, elem: T) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 64 | pub fn push_back(&mut self, elem: T) { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 76 | pub fn peek_front(&self) -> Option> { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 12 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `old_tail` [INFO] [stdout] --> src/fourth.rs:67:18 [INFO] [stdout] | [INFO] [stdout] 67 | Some(old_tail) => { [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_old_tail` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `push_back` is never used [INFO] [stdout] --> src/fourth.rs:64:12 [INFO] [stdout] | [INFO] [stdout] 27 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 64 | pub fn push_back(&mut self, elem: T) { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s [INFO] running `Command { std: "docker" "inspect" "caa62b126cd3783e058070cbbb67353bed8b4e5f0f80eb3f801909657c18c936", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "caa62b126cd3783e058070cbbb67353bed8b4e5f0f80eb3f801909657c18c936", kill_on_drop: false }` [INFO] [stdout] caa62b126cd3783e058070cbbb67353bed8b4e5f0f80eb3f801909657c18c936