[INFO] cloning repository https://github.com/camvassallo/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/camvassallo/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcamvassallo%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcamvassallo%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 36ea642f025da3bfa114b432284d3b14d762d70a
[INFO] fixing camvassallo/rust-playground against try#622891a4e29178280638a6b63a8908bde2c0c854+cargoflags=-Zfix-edition=start=2015 for pr-157817-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcamvassallo%2Frust-playground" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/camvassallo/rust-playground
[INFO] finished tweaking git repo https://github.com/camvassallo/rust-playground
[INFO] tweaked toml for git repo https://github.com/camvassallo/rust-playground written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/camvassallo/rust-playground on toolchain 622891a4e29178280638a6b63a8908bde2c0c854
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/camvassallo/rust-playground 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" "+622891a4e29178280638a6b63a8908bde2c0c854" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4
[INFO] running `Command { std: "docker" "start" "712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=" "-w" "/opt/rustwide/workdir" "--user" "0:0" "712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "fix" "--allow-no-vcs" "--allow-dirty" "--frozen" "--all" "--all-targets" "--message-format=json" "-Zfix-edition=start=2015", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `MinStack` is never constructed
[INFO] [stdout]   --> src/bin/stacks.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 | struct MinStack {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, `pop`, `top`, and `get_min` are never used
[INFO] [stdout]   --> src/bin/stacks.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 71 | impl MinStack {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 72 |     fn new() -> MinStack {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 79 |     fn push(&mut self, x: i32) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |     fn pop(&mut self) -> Option<i32> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 93 |     fn top(&self) -> i32 {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 97 |     fn get_min(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::linked_list::CursorMut`
[INFO] [stdout]  --> src/bin/doubly_linked_list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::linked_list::CursorMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Cursor`
[INFO] [stdout]  --> src/bin/doubly_linked_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::io::Cursor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `linked_list_cursors`
[INFO] [stdout]  --> src/bin/doubly_linked_list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::linked_list::CursorMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #58533 <https://github.com/rust-lang/rust/issues/58533> for more information
[INFO] [stdout]   = help: add `#![feature(linked_list_cursors)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2026-06-16; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remove_duplicates` is never used
[INFO] [stdout]   --> src/bin/static_arrays.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn remove_duplicates(a_list: &mut Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_concatenation_clean` is never used
[INFO] [stdout]   --> src/bin/dynamic_arrays.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn get_concatenation_clean(nums: &Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remove_duplicates` is never used
[INFO] [stdout]   --> src/bin/static_arrays.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn remove_duplicates(a_list: &mut Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/bin/singly_linked_list.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in 0..list_len {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::linked_list::CursorMut`
[INFO] [stdout]  --> src/bin/doubly_linked_list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::linked_list::CursorMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Cursor`
[INFO] [stdout]  --> src/bin/doubly_linked_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::io::Cursor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `linked_list_cursors`
[INFO] [stdout]  --> src/bin/doubly_linked_list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::linked_list::CursorMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #58533 <https://github.com/rust-lang/rust/issues/58533> for more information
[INFO] [stdout]   = help: add `#![feature(linked_list_cursors)]` to the crate attributes to enable
[INFO] [stdout]   = note: this compiler was built on 2026-06-16; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/doubly_linked_list.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn visit(&mut self, site: &str) {
[INFO] [stdout]    |                                    - help: try adding a return type: `-> LinkedList<String>`
[INFO] [stdout] 27 |         self.history
[INFO] [stdout]    |         ^^^^^^^^^^^^ expected `()`, found `LinkedList<String>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected unit type `()`
[INFO] [stdout]                  found struct `LinkedList<String>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/doubly_linked_list.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn visit(&mut self, site: &str) {
[INFO] [stdout]    |                                    - help: try adding a return type: `-> LinkedList<String>`
[INFO] [stdout] 27 |         self.history
[INFO] [stdout]    |         ^^^^^^^^^^^^ expected `()`, found `LinkedList<String>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected unit type `()`
[INFO] [stdout]                  found struct `LinkedList<String>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-playground` (bin "doubly_linked_list") due to 2 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rust-playground` (bin "doubly_linked_list" test) due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/bin/singly_linked_list.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in 0..list_len {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reverse` is never used
[INFO] [stdout]   --> src/bin/singly_linked_list.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn reverse(list: &mut LinkedList<i32>){
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `merge_sorted_linked_lists` is never used
[INFO] [stdout]   --> src/bin/singly_linked_list.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn merge_sorted_linked_lists(list1: &mut LinkedList<i32>, list2: &mut LinkedList<i32>) -> LinkedList<i32>{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_concatenation_clean` is never used
[INFO] [stdout]   --> src/bin/dynamic_arrays.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn get_concatenation_clean(nums: &Vec<i32>) -> Vec<i32> {
[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" "712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4", kill_on_drop: false }`
[INFO] [stdout] 712ea8696ef7ecae6e35845b86e8549ca08b5f3346d24bdab3a02ab1e053ebe4
