[INFO] cloning repository https://github.com/johnshift/rust-ds
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/johnshift/rust-ds" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjohnshift%2Frust-ds", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjohnshift%2Frust-ds'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 847ffdcbeeec919343eb397e689e60606b0bd8a3
[INFO] checking johnshift/rust-ds against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjohnshift%2Frust-ds" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/johnshift/rust-ds
[INFO] finished tweaking git repo https://github.com/johnshift/rust-ds
[INFO] tweaked toml for git repo https://github.com/johnshift/rust-ds written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/johnshift/rust-ds 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/johnshift/rust-ds 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] c0494649d90719b338d9cb595381ec71b70780cb12637763bd763eba3ff9f023
[INFO] running `Command { std: "docker" "start" "-a" "c0494649d90719b338d9cb595381ec71b70780cb12637763bd763eba3ff9f023", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0494649d90719b338d9cb595381ec71b70780cb12637763bd763eba3ff9f023", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0494649d90719b338d9cb595381ec71b70780cb12637763bd763eba3ff9f023", kill_on_drop: false }`
[INFO] [stdout] c0494649d90719b338d9cb595381ec71b70780cb12637763bd763eba3ff9f023
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 0682b427ed0d5c35304fe65ef4ce9012eccd70e6a6ff3b8356bb497395ba4636
[INFO] running `Command { std: "docker" "start" "-a" "0682b427ed0d5c35304fe65ef4ce9012eccd70e6a6ff3b8356bb497395ba4636", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking plotters-backend v0.3.2
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking half v1.7.1
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking plotters-svg v0.3.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking oorandom v11.1.3
[INFO] [stderr]     Checking hashmap v0.1.0 (/opt/rustwide/workdir/hashmap)
[INFO] [stderr]     Checking linked-list v0.1.0 (/opt/rustwide/workdir/linked-list)
[INFO] [stdout] warning: struct `SinglyLinkedList` is never constructed
[INFO] [stdout]   --> linked-list/src/lib.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct SinglyLinkedList<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]   --> linked-list/src/lib.rs:29:6
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl<T: Sized> SinglyLinkedList<T> {
[INFO] [stdout]    | ---------------------------------- associated items in this implementation
[INFO] [stdout] 29 |   fn new(value: T) -> Self {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |   fn len(&self) -> usize {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |   fn head(&self) -> Option<&T> {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |   fn tail(&self) -> Option<&T> {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 61 |   fn append(&mut self, value: T) {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 66 |   fn prepend(&mut self, value: T) {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |   fn insert(&mut self, index: usize, value: T) {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 78 |   fn remove(&mut self, index: usize) {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 83 |   fn reverse(&mut self) {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `LinkedList` is never constructed
[INFO] [stdout]   --> linked-list/src/bad_linked_list.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct LinkedList {
[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] warning: fields `value` and `next` are never read
[INFO] [stdout]   --> linked-list/src/bad_linked_list.rs:17:3
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Node {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 16 |   // final size: 16 bytes -> largest=8bytes multipled by two fields
[INFO] [stdout] 17 |   value: i32, // 4 bytes
[INFO] [stdout]    |   ^^^^^
[INFO] [stdout] 18 |   next: Link, // 8 bytes
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]   --> linked-list/src/bad_linked_list.rs:23:3
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct LinkedList {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 22 |   // final size: 8 bytes
[INFO] [stdout] 23 |   head: Link, // Link -> 8 bytes
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `prepend`, and `pop` are never used
[INFO] [stdout]   --> linked-list/src/bad_linked_list.rs:27:6
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl LinkedList {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 27 |   fn new() -> Self {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |   fn prepend(&mut self, value: i32) {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |   fn pop(&mut self) -> Option<i32> {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `List` is never constructed
[INFO] [stdout]   --> linked-list/src/better_linked_list.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | 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] error: struct `Iter` is never constructed
[INFO] [stdout]   --> linked-list/src/better_linked_list.rs:43:12
[INFO] [stdout]    |
[INFO] [stdout] 43 | 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] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `prepend`, `tail`, and `head` are never used
[INFO] [stdout]   --> linked-list/src/better_linked_list.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 15 |   fn new() -> Self {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |   fn prepend(&self, value: T) -> List<T> {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |   fn tail(&self) -> List<T> {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |   fn head(&self) -> Option<&T> {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `LinkedList` is never constructed
[INFO] [stdout]   --> linked-list/src/ok_linked_list.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct LinkedList<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]   --> linked-list/src/ok_linked_list.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub struct IntoIter<T>(LinkedList<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 `Iter` is never constructed
[INFO] [stdout]   --> linked-list/src/ok_linked_list.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 72 | 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] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `IterMut` is never constructed
[INFO] [stdout]   --> linked-list/src/ok_linked_list.rs:98:12
[INFO] [stdout]    |
[INFO] [stdout] 98 | 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] warning: associated items `new`, `prepend`, `peek`, and `peek_mut` are never used
[INFO] [stdout]   --> linked-list/src/ok_linked_list.rs:16:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T> LinkedList<T> {
[INFO] [stdout]    | --------------------- associated items in this implementation
[INFO] [stdout] 16 |   fn new() -> Self {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |   fn prepend(&mut self, value: T) {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |   fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |   fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> linked-list/src/ok_linked_list.rs:88:15
[INFO] [stdout]    |
[INFO] [stdout] 88 |   pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |               ^^^^^     ^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |               |
[INFO] [stdout]    |               the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 88 |   pub fn iter(&self) -> Iter<'_, T> {
[INFO] [stdout]    |                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> linked-list/src/ok_linked_list.rs:114:19
[INFO] [stdout]     |
[INFO] [stdout] 114 |   pub fn iter_mut(&mut self) -> IterMut<T> {
[INFO] [stdout]     |                   ^^^^^^^^^     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 114 |   pub fn iter_mut(&mut self) -> IterMut<'_, T> {
[INFO] [stdout]     |                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `linked-list` (lib) due to 7 previous errors; 9 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> linked-list/src/ok_linked_list.rs:88:15
[INFO] [stdout]    |
[INFO] [stdout] 88 |   pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |               ^^^^^     ^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |               |
[INFO] [stdout]    |               the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 88 |   pub fn iter(&self) -> Iter<'_, T> {
[INFO] [stdout]    |                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> linked-list/src/ok_linked_list.rs:114:19
[INFO] [stdout]     |
[INFO] [stdout] 114 |   pub fn iter_mut(&mut self) -> IterMut<T> {
[INFO] [stdout]     |                   ^^^^^^^^^     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 114 |   pub fn iter_mut(&mut self) -> IterMut<'_, T> {
[INFO] [stdout]     |                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0682b427ed0d5c35304fe65ef4ce9012eccd70e6a6ff3b8356bb497395ba4636", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0682b427ed0d5c35304fe65ef4ce9012eccd70e6a6ff3b8356bb497395ba4636", kill_on_drop: false }`
[INFO] [stdout] 0682b427ed0d5c35304fe65ef4ce9012eccd70e6a6ff3b8356bb497395ba4636
