[INFO] cloning repository https://github.com/Salehbigdeli/lists
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Salehbigdeli/lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSalehbigdeli%2Flists", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSalehbigdeli%2Flists'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7d9b30cec385d5b443129951b143f87cc71ac8ac
[INFO] checking Salehbigdeli/lists against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSalehbigdeli%2Flists" "/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/Salehbigdeli/lists
[INFO] finished tweaking git repo https://github.com/Salehbigdeli/lists
[INFO] tweaked toml for git repo https://github.com/Salehbigdeli/lists written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Salehbigdeli/lists on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Salehbigdeli/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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 60c3d3f164b2afa157776ddb1160fe974a8870cad7fe478a12f60b35cbd0ac86
[INFO] running `Command { std: "docker" "start" "-a" "60c3d3f164b2afa157776ddb1160fe974a8870cad7fe478a12f60b35cbd0ac86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "60c3d3f164b2afa157776ddb1160fe974a8870cad7fe478a12f60b35cbd0ac86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60c3d3f164b2afa157776ddb1160fe974a8870cad7fe478a12f60b35cbd0ac86", kill_on_drop: false }`
[INFO] [stdout] 60c3d3f164b2afa157776ddb1160fe974a8870cad7fe478a12f60b35cbd0ac86
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 476f27ba613664725195a6fe949d8e91cf6794ca1887eab394eb802aceb4b9e5
[INFO] running `Command { std: "docker" "start" "-a" "476f27ba613664725195a6fe949d8e91cf6794ca1887eab394eb802aceb4b9e5", kill_on_drop: false }`
[INFO] [stderr]     Checking lists v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `first::Node` is more private than the item `List1::More::0`
[INFO] [stdout]   --> src/first.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 |     More(Box<Node>),
[INFO] [stdout]    |          ^^^^^^^^^ field `List1::More::0` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `first::Node` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/first.rs:27:1
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Node {
[INFO] [stdout]    | ^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node1` is never constructed
[INFO] [stdout]  --> src/first.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Node1 {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `More` is never constructed
[INFO] [stdout]   --> src/first.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | enum Link {
[INFO] [stdout]    |      ---- variant in this enum
[INFO] [stdout] 23 |     Empty,
[INFO] [stdout] 24 |     More(Box<Node>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `elem` is never read
[INFO] [stdout]   --> src/first.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Node {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 28 |     elem: i32,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used
[INFO] [stdout]   --> src/first.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl List {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 33 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn push(&mut self, val: i32) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn pop(&mut self) -> Option<i32> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `Iter` is never constructed
[INFO] [stdout]  --> src/second.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct Iter<'a, T> {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]   = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `IterMut` is never constructed
[INFO] [stdout]   --> src/second.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct IterMut<'a, T> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `IntoIter` is never constructed
[INFO] [stdout]   --> src/second.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub struct IntoIter<T>(List<T>);
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `List` is never constructed
[INFO] [stdout]   --> src/second.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub struct List<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]   --> src/second.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 53 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn push(&mut self, val: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 76 |     fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 80 |     fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 84 |     fn iter<'a>(&'a self) -> Iter<'a, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 87 |     fn iter_mut<'a>(&'a mut self) -> IterMut<'a, T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lists` (lib) due to 4 previous errors; 6 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: type `first::Node` is more private than the item `List1::More::0`
[INFO] [stdout]   --> src/first.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 |     More(Box<Node>),
[INFO] [stdout]    |          ^^^^^^^^^ field `List1::More::0` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `first::Node` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/first.rs:27:1
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Node {
[INFO] [stdout]    | ^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node1` is never constructed
[INFO] [stdout]  --> src/first.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Node1 {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "476f27ba613664725195a6fe949d8e91cf6794ca1887eab394eb802aceb4b9e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "476f27ba613664725195a6fe949d8e91cf6794ca1887eab394eb802aceb4b9e5", kill_on_drop: false }`
[INFO] [stdout] 476f27ba613664725195a6fe949d8e91cf6794ca1887eab394eb802aceb4b9e5