[INFO] fetching crate skiplist-rust 0.3.0... [INFO] checking skiplist-rust-0.3.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170 [INFO] extracting crate skiplist-rust 0.3.0 into /workspace/builds/worker-0-tc2/source [INFO] removed /workspace/builds/worker-0-tc2/source/rust-toolchain.toml [INFO] started tweaking crates.io crate skiplist-rust 0.3.0 [INFO] finished tweaking crates.io crate skiplist-rust 0.3.0 [INFO] tweaked toml for crates.io crate skiplist-rust 0.3.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate skiplist-rust 0.3.0 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 14 packages to latest compatible versions [INFO] [stderr] Adding rand v0.8.5 (available: v0.9.1) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] ab26ca04b14233df02fbd8144091f44e43ae215d3f4307c23b73daab07e2b339 [INFO] running `Command { std: "docker" "start" "-a" "ab26ca04b14233df02fbd8144091f44e43ae215d3f4307c23b73daab07e2b339", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "ab26ca04b14233df02fbd8144091f44e43ae215d3f4307c23b73daab07e2b339", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ab26ca04b14233df02fbd8144091f44e43ae215d3f4307c23b73daab07e2b339", kill_on_drop: false }` [INFO] [stdout] ab26ca04b14233df02fbd8144091f44e43ae215d3f4307c23b73daab07e2b339 [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" "-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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] f05074331ffb20d293bcaae264fc57a5330184d801c467b42925b2abd83769c7 [INFO] running `Command { std: "docker" "start" "-a" "f05074331ffb20d293bcaae264fc57a5330184d801c467b42925b2abd83769c7", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.174 [INFO] [stderr] Compiling zerocopy v0.8.26 [INFO] [stderr] Checking cfg-if v1.0.1 [INFO] [stderr] Checking getrandom v0.2.16 [INFO] [stderr] Checking rand_core v0.6.4 [INFO] [stderr] Checking ppv-lite86 v0.2.21 [INFO] [stderr] Checking rand_chacha v0.3.1 [INFO] [stderr] Checking rand v0.8.5 [INFO] [stderr] Checking skiplist-rust v0.3.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: struct `SkipList` is never constructed [INFO] [stdout] --> src/lib.rs:245:8 [INFO] [stdout] | [INFO] [stdout] 245 | struct SkipList { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `insert`, `contains`, and `iter` are never used [INFO] [stdout] --> src/lib.rs:254:12 [INFO] [stdout] | [INFO] [stdout] 253 | impl SkipList { [INFO] [stdout] | ------------------------------------------ associated items in this implementation [INFO] [stdout] 254 | pub fn new(arena: Arena) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 261 | pub fn insert(&self, key: K) { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 268 | pub fn contains(&self, key: &K) -> bool { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 274 | pub fn iter(&self) -> SkipListIterator { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing [INFO] [stdout] --> src/lib.rs:274:17 [INFO] [stdout] | [INFO] [stdout] 274 | pub fn iter(&self) -> SkipListIterator { [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] 274 | pub fn iter(&self) -> SkipListIterator<'_, K> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:313:13 [INFO] [stdout] | [INFO] [stdout] 313 | let mut list = SkipList::new(arena); [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` 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/lib.rs:274:17 [INFO] [stdout] | [INFO] [stdout] 274 | pub fn iter(&self) -> SkipListIterator { [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] 274 | pub fn iter(&self) -> SkipListIterator<'_, K> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.27s [INFO] running `Command { std: "docker" "inspect" "f05074331ffb20d293bcaae264fc57a5330184d801c467b42925b2abd83769c7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f05074331ffb20d293bcaae264fc57a5330184d801c467b42925b2abd83769c7", kill_on_drop: false }` [INFO] [stdout] f05074331ffb20d293bcaae264fc57a5330184d801c467b42925b2abd83769c7