[INFO] cloning repository https://github.com/tudorpaisa/many_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/tudorpaisa/many_linked_lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftudorpaisa%2Fmany_linked_lists", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftudorpaisa%2Fmany_linked_lists'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] c7ae5dea96f1362c218240906e5a967d508958f5 [INFO] checking tudorpaisa/many_linked_lists against master#accc516128b21e960b1a7af45393e9acdd184890 for pr-122501 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftudorpaisa%2Fmany_linked_lists" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/tudorpaisa/many_linked_lists on toolchain accc516128b21e960b1a7af45393e9acdd184890 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+accc516128b21e960b1a7af45393e9acdd184890" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/tudorpaisa/many_linked_lists [INFO] finished tweaking git repo https://github.com/tudorpaisa/many_linked_lists [INFO] tweaked toml for git repo https://github.com/tudorpaisa/many_linked_lists written to /workspace/builds/worker-5-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/tudorpaisa/many_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" "+accc516128b21e960b1a7af45393e9acdd184890" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [ERROR] error running command: no output for 300 seconds [ERROR] this task or one of its parent failed! [ERROR] no output for 300 seconds [ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace. [INFO] checking tudorpaisa/many_linked_lists against try#32f93a5733992b29f321831b7e26c1f7d7205013 for pr-122501 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftudorpaisa%2Fmany_linked_lists" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/tudorpaisa/many_linked_lists on toolchain 32f93a5733992b29f321831b7e26c1f7d7205013 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+32f93a5733992b29f321831b7e26c1f7d7205013" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/tudorpaisa/many_linked_lists [INFO] finished tweaking git repo https://github.com/tudorpaisa/many_linked_lists [INFO] tweaked toml for git repo https://github.com/tudorpaisa/many_linked_lists written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/tudorpaisa/many_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" "+32f93a5733992b29f321831b7e26c1f7d7205013" "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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+32f93a5733992b29f321831b7e26c1f7d7205013" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 60c507dd582770f984c84b5cf2fa72fc00cac029e080d78ca36458ce46e7c73b [INFO] running `Command { std: "docker" "start" "-a" "60c507dd582770f984c84b5cf2fa72fc00cac029e080d78ca36458ce46e7c73b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "60c507dd582770f984c84b5cf2fa72fc00cac029e080d78ca36458ce46e7c73b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "60c507dd582770f984c84b5cf2fa72fc00cac029e080d78ca36458ce46e7c73b", kill_on_drop: false }` [INFO] [stdout] 60c507dd582770f984c84b5cf2fa72fc00cac029e080d78ca36458ce46e7c73b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+32f93a5733992b29f321831b7e26c1f7d7205013" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 0503fbd2616f79f271a8580e655267da12cba0e97ac7a31acfa25e712b51e6ba [INFO] running `Command { std: "docker" "start" "-a" "0503fbd2616f79f271a8580e655267da12cba0e97ac7a31acfa25e712b51e6ba", kill_on_drop: false }` [INFO] [stderr] Checking many_linked_lists v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: the item `FromIterator` is imported redundantly [INFO] [stdout] --> src/sixth.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::iter::FromIterator; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] --> /rustc/32f93a5733992b29f321831b7e26c1f7d7205013/library/std/src/prelude/mod.rs:129:13 [INFO] [stdout] | [INFO] [stdout] = note: the item `FromIterator` is already defined here [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `FromIterator` is imported redundantly [INFO] [stdout] --> src/sixth.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::iter::FromIterator; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] --> /rustc/32f93a5733992b29f321831b7e26c1f7d7205013/library/std/src/prelude/mod.rs:129:13 [INFO] [stdout] | [INFO] [stdout] = note: the item `FromIterator` is already defined here [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/fifth.rs:21:13 [INFO] [stdout] | [INFO] [stdout] 21 | let mut new_tail = Box::into_raw(Box::new(Node { [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: method `pop_node` is never used [INFO] [stdout] --> src/first.rs:42:8 [INFO] [stdout] | [INFO] [stdout] 18 | impl List { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 42 | fn pop_node(&mut self) -> Link { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `pop_node`, `peek`, and `peek_mut` are never used [INFO] [stdout] --> src/second.rs:36:8 [INFO] [stdout] | [INFO] [stdout] 15 | impl List { [INFO] [stdout] | --------------- methods in this implementation [INFO] [stdout] ... [INFO] [stdout] 36 | fn pop_node(&mut self) -> Link { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 43 | fn peek(&self) -> Option<&T> { [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | 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:60:8 [INFO] [stdout] | [INFO] [stdout] 59 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] 60 | fn into_iter(self) -> IntoIter { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `iter` is never used [INFO] [stdout] --> src/second.rs:83:8 [INFO] [stdout] | [INFO] [stdout] 79 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 83 | fn iter<'a>(&'a self) -> Iter<'a, T> { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/fifth.rs:21:13 [INFO] [stdout] | [INFO] [stdout] 21 | let mut new_tail = Box::into_raw(Box::new(Node { [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: method `pop_node` is never used [INFO] [stdout] --> src/first.rs:42:8 [INFO] [stdout] | [INFO] [stdout] 18 | impl List { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 42 | fn pop_node(&mut self) -> Link { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `pop_node` is never used [INFO] [stdout] --> src/second.rs:36:8 [INFO] [stdout] | [INFO] [stdout] 15 | impl List { [INFO] [stdout] | --------------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 36 | fn pop_node(&mut self) -> Link { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.59s [INFO] running `Command { std: "docker" "inspect" "0503fbd2616f79f271a8580e655267da12cba0e97ac7a31acfa25e712b51e6ba", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0503fbd2616f79f271a8580e655267da12cba0e97ac7a31acfa25e712b51e6ba", kill_on_drop: false }` [INFO] [stdout] 0503fbd2616f79f271a8580e655267da12cba0e97ac7a31acfa25e712b51e6ba