[INFO] cloning repository https://github.com/pr0f37/rust-linked-lists [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pr0f37/rust-linked-lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpr0f37%2Frust-linked-lists", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpr0f37%2Frust-linked-lists'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 8d64eab039ac64b504c8ef7943e6056ea703ddb8 [INFO] checking pr0f37/rust-linked-lists against try#8a0378607d6b34c242e3bfa75554871be641864b for pr-143028 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpr0f37%2Frust-linked-lists" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/pr0f37/rust-linked-lists [INFO] finished tweaking git repo https://github.com/pr0f37/rust-linked-lists [INFO] tweaked toml for git repo https://github.com/pr0f37/rust-linked-lists written to /workspace/builds/worker-4-tc2/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/pr0f37/rust-linked-lists on toolchain 8a0378607d6b34c242e3bfa75554871be641864b [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a0378607d6b34c242e3bfa75554871be641864b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/pr0f37/rust-linked-lists 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" "+8a0378607d6b34c242e3bfa75554871be641864b" "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-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a0378607d6b34c242e3bfa75554871be641864b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] ecfabb05944a775dee41e5cf6ec12a3017b8568b2b6ddc53051de3328eb3231d [INFO] running `Command { std: "docker" "start" "-a" "ecfabb05944a775dee41e5cf6ec12a3017b8568b2b6ddc53051de3328eb3231d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "ecfabb05944a775dee41e5cf6ec12a3017b8568b2b6ddc53051de3328eb3231d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ecfabb05944a775dee41e5cf6ec12a3017b8568b2b6ddc53051de3328eb3231d", kill_on_drop: false }` [INFO] [stdout] ecfabb05944a775dee41e5cf6ec12a3017b8568b2b6ddc53051de3328eb3231d [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" "-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" "+8a0378607d6b34c242e3bfa75554871be641864b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] c9451cba30e6df013fd1a711d0acb7cfb0d4c5b36e39af418b92d3b8394d7952 [INFO] running `Command { std: "docker" "start" "-a" "c9451cba30e6df013fd1a711d0acb7cfb0d4c5b36e39af418b92d3b8394d7952", kill_on_drop: false }` [INFO] [stderr] Checking lists v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: field `next` is never read [INFO] [stdout] --> src/second.rs:93:5 [INFO] [stdout] | [INFO] [stdout] 92 | pub struct IterMut<'a, T> { [INFO] [stdout] | ------- field in this struct [INFO] [stdout] 93 | next: Option<&'a mut Node>, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing [INFO] [stdout] --> src/second.rs:27:17 [INFO] [stdout] | [INFO] [stdout] 27 | pub fn iter(&self) -> Iter { [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] 27 | pub fn iter(&self) -> Iter<'_, T> { [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.rs:33:21 [INFO] [stdout] | [INFO] [stdout] 33 | pub fn iter_mut(&mut self) -> IterMut { [INFO] [stdout] | ^^^^^^^^^ ---------- the lifetime gets resolved as `'_` [INFO] [stdout] | | [INFO] [stdout] | this lifetime flows to the output [INFO] [stdout] | [INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths [INFO] [stdout] | [INFO] [stdout] 33 | pub fn iter_mut(&mut self) -> IterMut<'_, T> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `next` is never read [INFO] [stdout] --> src/second.rs:93:5 [INFO] [stdout] | [INFO] [stdout] 92 | pub struct IterMut<'a, T> { [INFO] [stdout] | ------- field in this struct [INFO] [stdout] 93 | next: Option<&'a mut Node>, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing [INFO] [stdout] --> src/second.rs:27:17 [INFO] [stdout] | [INFO] [stdout] 27 | pub fn iter(&self) -> Iter { [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] 27 | pub fn iter(&self) -> Iter<'_, T> { [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.rs:33:21 [INFO] [stdout] | [INFO] [stdout] 33 | pub fn iter_mut(&mut self) -> IterMut { [INFO] [stdout] | ^^^^^^^^^ ---------- the lifetime gets resolved as `'_` [INFO] [stdout] | | [INFO] [stdout] | this lifetime flows to the output [INFO] [stdout] | [INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths [INFO] [stdout] | [INFO] [stdout] 33 | pub fn iter_mut(&mut self) -> IterMut<'_, T> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s [INFO] running `Command { std: "docker" "inspect" "c9451cba30e6df013fd1a711d0acb7cfb0d4c5b36e39af418b92d3b8394d7952", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c9451cba30e6df013fd1a711d0acb7cfb0d4c5b36e39af418b92d3b8394d7952", kill_on_drop: false }` [INFO] [stdout] c9451cba30e6df013fd1a711d0acb7cfb0d4c5b36e39af418b92d3b8394d7952