[INFO] updating cached repository https://github.com/modulitos/CtCI-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8bbaa49c3eca43a77cf1a2cea1b6f98071ad2c78
[INFO] checking modulitos/CtCI-rust against try#8a749131e7beb72f6edacefd2bdcbed3d67b2112 for pr-72331
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2FCtCI-rust" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/modulitos/CtCI-rust on toolchain 8a749131e7beb72f6edacefd2bdcbed3d67b2112
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/modulitos/CtCI-rust
[INFO] finished tweaking git repo https://github.com/modulitos/CtCI-rust
[INFO] tweaked toml for git repo https://github.com/modulitos/CtCI-rust written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/modulitos/CtCI-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 41f108f36b9ff76d6f0dea6a1847193767b6692dd412d429499c99315ba0c937
[INFO] running `"docker" "start" "-a" "41f108f36b9ff76d6f0dea6a1847193767b6692dd412d429499c99315ba0c937"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]     Checking getrandom v0.1.7
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]    Compiling regex v1.3.1
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]     Checking rust-solutions v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/linked_list/second.rs:11:27
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub type Link<T> = Option<(Box<Node<T>>)>;
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::List`
[INFO] [stderr]    --> src/linked_list/second.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 |     use super::List;
[INFO] [stderr]     |         ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashSet`
[INFO] [stderr]  --> src/linked_list/third.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashSet`
[INFO] [stderr]  --> src/linked_list/fifth.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::HashSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashSet`
[INFO] [stderr]  --> src/linked_list/refcell_singly.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::collections::HashSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/stack.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/binary_search_tree.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Ord`, `Ordering`
[INFO] [stderr]  --> src/graph.rs:1:16
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp::{Ord, Ordering};
[INFO] [stderr]   |                ^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/graph.rs:178:9
[INFO] [stderr]     |
[INFO] [stderr] 178 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/binary_tree.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/binary_tree_refcell.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/binary_search_tree_refcell.rs:128:9
[INFO] [stderr]     |
[INFO] [stderr] 128 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/linked_list/second.rs:11:27
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub type Link<T> = Option<(Box<Node<T>>)>;
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashSet`
[INFO] [stderr]  --> src/linked_list/third.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashSet`
[INFO] [stderr]  --> src/linked_list/fifth.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::HashSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Ord`, `Ordering`
[INFO] [stderr]  --> src/graph.rs:1:16
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp::{Ord, Ordering};
[INFO] [stderr]   |                ^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list/second.rs:67:12
[INFO] [stderr]    |
[INFO] [stderr] 67 |     pub fn new() -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `into_iter`
[INFO] [stderr]   --> src/linked_list/second.rs:71:12
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter`
[INFO] [stderr]   --> src/linked_list/second.rs:76:12
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter_mut`
[INFO] [stderr]   --> src/linked_list/second.rs:84:12
[INFO] [stderr]    |
[INFO] [stderr] 84 |     pub fn iter_mut(&mut self) -> IterMut<'_, T> {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `push`
[INFO] [stderr]   --> src/linked_list/second.rs:90:12
[INFO] [stderr]    |
[INFO] [stderr] 90 |     pub fn push(&mut self, elem: T) {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `peek`
[INFO] [stderr]    --> src/linked_list/second.rs:119:12
[INFO] [stderr]     |
[INFO] [stderr] 119 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `peek_mut`
[INFO] [stderr]    --> src/linked_list/second.rs:123:12
[INFO] [stderr]     |
[INFO] [stderr] 123 |     pub fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stderr]     |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list/third.rs:21:12
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub fn new() -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `append`
[INFO] [stderr]   --> src/linked_list/third.rs:25:12
[INFO] [stderr]    |
[INFO] [stderr] 25 |     pub fn append(&mut self, elem: T) -> Self {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `tail`
[INFO] [stderr]   --> src/linked_list/third.rs:35:12
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn tail(&self) -> Self {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `head`
[INFO] [stderr]   --> src/linked_list/third.rs:40:12
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn head(&self) -> Option<&T> {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter`
[INFO] [stderr]    --> src/linked_list/third.rs:107:12
[INFO] [stderr]     |
[INFO] [stderr] 107 |     pub fn iter(&self) -> Iter<'_, T> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list/fourth.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 |     fn new(elem: T) -> Rc<RefCell<Self>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list/fourth.rs:29:12
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn new() -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `push_front`
[INFO] [stderr]   --> src/linked_list/fourth.rs:35:12
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn push_front(&mut self, elem: T) {
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `peek_front`
[INFO] [stderr]   --> src/linked_list/fourth.rs:76:12
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn peek_front(&self) -> Option<Ref<T>> {
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `prev`
[INFO] [stderr]   --> src/linked_list/brandon.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     prev: Option<NodeRef<T>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `tail`
[INFO] [stderr]   --> src/linked_list/brandon.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn tail(node: &NodeRef<T>) -> Option<NodeRef<T>> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `remove`
[INFO] [stderr]   --> src/linked_list/brandon.rs:46:8
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn remove(&mut self) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list/brandon.rs:64:8
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn new() -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `append`
[INFO] [stderr]   --> src/linked_list/brandon.rs:68:8
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn append(&mut self, new_value: T) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `tail`
[INFO] [stderr]   --> src/linked_list/brandon.rs:85:8
[INFO] [stderr]    |
[INFO] [stderr] 85 |     fn tail(&self) -> Option<NodeRef<T>> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter`
[INFO] [stderr]   --> src/linked_list/brandon.rs:96:8
[INFO] [stderr]    |
[INFO] [stderr] 96 |     fn iter(&self) -> Iter<T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `list_has_duplicates`
[INFO] [stderr]    --> src/linked_list/brandon.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |     fn list_has_duplicates(&self) -> bool {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `remove_duplicates`
[INFO] [stderr]    --> src/linked_list/brandon.rs:117:8
[INFO] [stderr]     |
[INFO] [stderr] 117 |     fn remove_duplicates(&mut self) {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]    --> src/linked_list/brandon.rs:228:4
[INFO] [stderr]     |
[INFO] [stderr] 228 | fn main() {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/linked_list/fifth.rs:24:12
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn new() -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `push`
[INFO] [stderr]   --> src/linked_list/fifth.rs:31:12
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn push(&mut self, elem: T) {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `pop`
[INFO] [stderr]   --> src/linked_list/fifth.rs:53:12
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 41 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Node`
[INFO] [stderr]   --> src/bin/ch2-p7_check-intersection.rs:11:48
[INFO] [stderr]    |
[INFO] [stderr] 11 | use cracking::{SinglyLinkedList as LinkedList, Node};
[INFO] [stderr]    |                                                ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/bin/ch3-p1_three-in-one.rs:84:9
[INFO] [stderr]    |
[INFO] [stderr] 84 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::RefCell`
[INFO] [stderr]   --> src/bin/ch2-p7_check-intersection.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::cell::RefCell;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/bin/ch2-p7_check-intersection.rs:56:9
[INFO] [stderr]    |
[INFO] [stderr] 56 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `ch2_p7_check_intersection`
[INFO] [stderr]    --> src/bin/ch2-p7_check-intersection.rs:10:1
[INFO] [stderr]     |
[INFO] [stderr] 10  | / extern crate cracking;
[INFO] [stderr] 11  | | use cracking::{SinglyLinkedList as LinkedList, Node};
[INFO] [stderr] 12  | |
[INFO] [stderr] 13  | | use std::rc::Rc;
[INFO] [stderr] ...   |
[INFO] [stderr] 145 | |     }
[INFO] [stderr] 146 | | }
[INFO] [stderr]     | |_^ consider adding a `main` function to `src/bin/ch2-p7_check-intersection.rs`
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `ch5_p6_conversion`
[INFO] [stderr]   --> src/bin/ch5-p6_conversion.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / fn determine_bits_basic(mut n1: u16, mut n2: u16) -> u8 {
[INFO] [stderr] 8  | |     let mut bits = 0;
[INFO] [stderr] 9  | |     while n1 > 0 || n2 > 0 {
[INFO] [stderr] 10 | |         // println!("n1: {:b}", n1);
[INFO] [stderr] ...  |
[INFO] [stderr] 41 | |     assert_eq!(determine_bits(0b11101_u16, 0b01111_u16), 2);
[INFO] [stderr] 42 | | }
[INFO] [stderr]    | |_^ consider adding a `main` function to `src/bin/ch5-p6_conversion.rs`
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `ch3_p1_three_in_one`
[INFO] [stderr]    --> src/bin/ch3-p1_three-in-one.rs:3:1
[INFO] [stderr]     |
[INFO] [stderr] 3   | / use std::boxed::Box;
[INFO] [stderr] 4   | | use std::cmp;
[INFO] [stderr] 5   | |
[INFO] [stderr] 6   | | type Node<T> = Option<T>;
[INFO] [stderr] ...   |
[INFO] [stderr] 173 | |     }
[INFO] [stderr] 174 | | }
[INFO] [stderr]     | |_^ consider adding a `main` function to `src/bin/ch3-p1_three-in-one.rs`
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `ch5_p4_next_number`
[INFO] [stderr]   --> src/bin/ch5-p4_next-number.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / fn next_numbers(n: i32) -> (i32, i32) {
[INFO] [stderr] 8  | |     (get_next_smallest(n), get_next_largest(n))
[INFO] [stderr] 9  | | }
[INFO] [stderr] 10 | |
[INFO] [stderr] ...  |
[INFO] [stderr] 82 | |     )
[INFO] [stderr] 83 | | }
[INFO] [stderr]    | |_^ consider adding a `main` function to `src/bin/ch5-p4_next-number.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] warning: unused import: `Node`
[INFO] [stderr]   --> src/bin/ch2-p8_loop-detection.rs:10:28
[INFO] [stderr]    |
[INFO] [stderr] 10 | use cracking::{HashedNode, Node, NodeRef, SinglyLinkedList as LinkedList};
[INFO] [stderr]    |                            ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::RefCell`
[INFO] [stderr]   --> src/bin/ch2-p8_loop-detection.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::cell::RefCell;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/bin/ch2-p8_loop-detection.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `ch2_p8_loop_detection`
[INFO] [stderr]    --> src/bin/ch2-p8_loop-detection.rs:9:1
[INFO] [stderr]     |
[INFO] [stderr] 9   | / extern crate cracking;
[INFO] [stderr] 10  | | use cracking::{HashedNode, Node, NodeRef, SinglyLinkedList as LinkedList};
[INFO] [stderr] 11  | |
[INFO] [stderr] 12  | | use std::collections::HashSet;
[INFO] [stderr] ...   |
[INFO] [stderr] 165 | |     }
[INFO] [stderr] 166 | | }
[INFO] [stderr]     | |_^ consider adding a `main` function to `src/bin/ch2-p8_loop-detection.rs`
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust-solutions`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error; 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error[E0601]: `main` function not found in crate `ch7_p5_online_book_reader`
[INFO] [stderr]    --> src/bin/ch7-p5_online-book-reader.rs:14:1
[INFO] [stderr]     |
[INFO] [stderr] 14  | / use std::collections::HashMap;
[INFO] [stderr] 15  | | #[macro_use]
[INFO] [stderr] 16  | | extern crate derive_more;
[INFO] [stderr] 17  | |
[INFO] [stderr] ...   |
[INFO] [stderr] 268 | |     assert_eq!(reader.turn_page().current_page, Some(3));
[INFO] [stderr] 269 | | }
[INFO] [stderr]     | |_^ consider adding a `main` function to `src/bin/ch7-p5_online-book-reader.rs`
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `map` as mutable because it is also borrowed as immutable
[INFO] [stderr]   --> src/bin/ch1-p3_check-permutation.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 14 |         if let Some(count) = map.get(&c) {
[INFO] [stderr]    |                              --- immutable borrow occurs here
[INFO] [stderr] 15 |             map.insert(c, count + 1);
[INFO] [stderr]    |             ^^^           ----- immutable borrow later used here
[INFO] [stderr]    |             |
[INFO] [stderr]    |             mutable borrow occurs here
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]    = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]    = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: could not compile `rust-solutions`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rust-solutions`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Manager`
[INFO] [stderr]   --> src/bin/ch7-p2_call-center.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     Manager,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `from`
[INFO] [stderr]   --> src/bin/ch7-p2_call-center.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     from: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust-solutions`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error; 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust-solutions`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: cannot borrow `map` as mutable because it is also borrowed as immutable
[INFO] [stderr]   --> src/bin/ch1-p3_check-permutation.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 14 |         if let Some(count) = map.get(&c) {
[INFO] [stderr]    |                              --- immutable borrow occurs here
[INFO] [stderr] 15 |             map.insert(c, count + 1);
[INFO] [stderr]    |             ^^^           ----- immutable borrow later used here
[INFO] [stderr]    |             |
[INFO] [stderr]    |             mutable borrow occurs here
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]    = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]    = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: could not compile `rust-solutions`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/stack.rs:153:13
[INFO] [stderr]     |
[INFO] [stderr] 153 |         let mut s: Stack<u64> = Stack::new();
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `list_has_duplicates`
[INFO] [stderr]    --> src/linked_list/brandon.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |     fn list_has_duplicates(&self) -> bool {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]    --> src/linked_list/brandon.rs:228:4
[INFO] [stderr]     |
[INFO] [stderr] 228 | fn main() {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "41f108f36b9ff76d6f0dea6a1847193767b6692dd412d429499c99315ba0c937"`
[INFO] running `"docker" "rm" "-f" "41f108f36b9ff76d6f0dea6a1847193767b6692dd412d429499c99315ba0c937"`
[INFO] [stdout] 41f108f36b9ff76d6f0dea6a1847193767b6692dd412d429499c99315ba0c937