[INFO] cloning repository https://github.com/BranLiang/the-rust-book-exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BranLiang/the-rust-book-exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBranLiang%2Fthe-rust-book-exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBranLiang%2Fthe-rust-book-exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 30a1e41b7f204c1d48371e77a4e4e2fffaf231dc
[INFO] checking BranLiang/the-rust-book-exercise against try#024378d9203a4009ed73d6db2681b88a8d74ce7a for pr-112160
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBranLiang%2Fthe-rust-book-exercise" "/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/BranLiang/the-rust-book-exercise on toolchain 024378d9203a4009ed73d6db2681b88a8d74ce7a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BranLiang/the-rust-book-exercise
[INFO] finished tweaking git repo https://github.com/BranLiang/the-rust-book-exercise
[INFO] tweaked toml for git repo https://github.com/BranLiang/the-rust-book-exercise written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/BranLiang/the-rust-book-exercise 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" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e230308b2334a91c2c18451be0223c39f84567d35a5e53d3cf468088830c67db
[INFO] running `Command { std: "docker" "start" "-a" "e230308b2334a91c2c18451be0223c39f84567d35a5e53d3cf468088830c67db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e230308b2334a91c2c18451be0223c39f84567d35a5e53d3cf468088830c67db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e230308b2334a91c2c18451be0223c39f84567d35a5e53d3cf468088830c67db", kill_on_drop: false }`
[INFO] [stdout] e230308b2334a91c2c18451be0223c39f84567d35a5e53d3cf468088830c67db
[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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 382b51bf602acecc3e3705832bdae23afa78ad97b4849469b776508066ed0de0
[INFO] running `Command { std: "docker" "start" "-a" "382b51bf602acecc3e3705832bdae23afa78ad97b4849469b776508066ed0de0", kill_on_drop: false }`
[INFO] [stderr]     Checking the-rust-book-exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/ch17/encoding_type.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> src/ch17/state_pattern.rs:47:27
[INFO] [stdout]    |
[INFO] [stdout] 47 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mean` is never used
[INFO] [stdout]  --> src/ch08/list_of_integers.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn mean(list: &Vec<i32>) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `median` is never used
[INFO] [stdout]   --> src/ch08/list_of_integers.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn median(list: &Vec<i32>) -> i32 {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mode` is never used
[INFO] [stdout]   --> src/ch08/list_of_integers.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn mode(list: &Vec<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pig_latin` is never used
[INFO] [stdout]  --> src/ch08/pig_latin.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn pig_latin(sentence: &String) -> String {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Company` is never used
[INFO] [stdout]  --> src/ch08/text_interface.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | type Company = HashMap<String, Vec<String>>;
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_employee` is never used
[INFO] [stdout]  --> src/ch08/text_interface.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn add_employee(company: &mut Company, cmd: &str) {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `people` is never used
[INFO] [stdout]   --> src/ch08/text_interface.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn people<'a>(company: &'a Company, department: &str) -> &'a Vec<String> {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]  --> src/ch17/state_pattern.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Post {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] 2 |     state: Option<Box<dyn State>>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, `approve`, and `reject` are never used
[INFO] [stdout]   --> src/ch17/state_pattern.rs:7:12
[INFO] [stdout]    |
[INFO] [stdout] 6  | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 7  |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 |     pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub fn content(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn request_review(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn approve(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn reject(&mut self) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]  --> src/ch17/encoding_type.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Post {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `content` are never used
[INFO] [stdout]   --> src/ch17/encoding_type.rs:6:12
[INFO] [stdout]    |
[INFO] [stdout] 5  | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 6  |     pub fn new() -> DraftPost {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 10 |     pub fn content(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DraftPost` is never constructed
[INFO] [stdout]   --> src/ch17/encoding_type.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct DraftPost {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `request_review` and `add_text` are never used
[INFO] [stdout]   --> src/ch17/encoding_type.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl DraftPost {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 20 |     pub fn request_review(self) -> PendingReviewPost {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReviewPost` is never constructed
[INFO] [stdout]   --> src/ch17/encoding_type.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct PendingReviewPost {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `approve` and `reject` are never used
[INFO] [stdout]   --> src/ch17/encoding_type.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl PendingReviewPost {
[INFO] [stdout]    | ---------------------- methods in this implementation
[INFO] [stdout] 34 |     pub fn approve(self) -> ReviewedPost {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub fn reject(self) -> DraftPost {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ReviewedPost` is never constructed
[INFO] [stdout]   --> src/ch17/encoding_type.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct ReviewedPost {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `approve` and `reject` are never used
[INFO] [stdout]   --> src/ch17/encoding_type.rs:48:12
[INFO] [stdout]    |
[INFO] [stdout] 47 | impl ReviewedPost {
[INFO] [stdout]    | ----------------- methods in this implementation
[INFO] [stdout] 48 |     pub fn approve(self) -> Post {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     pub fn reject(self) -> PendingReviewPost {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LimitTracker` is never constructed
[INFO] [stdout]  --> src/ch15/mod.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LimitTracker<'a, T: Messenger> {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `set_value` are never used
[INFO] [stdout]   --> src/ch15/mod.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<'a, T> LimitTracker<'a, T> where T: Messenger {
[INFO] [stdout]    | ------------------------------- associated items in this implementation
[INFO] [stdout] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]  --> src/ch08/pig_latin.rs:9:41
[INFO] [stdout]   |
[INFO] [stdout] 9 |             pig_latin_word.push_str(word.clone());
[INFO] [stdout]   |                                         ^^^^^^^^ unnecessary method call
[INFO] [stdout]   |
[INFO] [stdout]   = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout]   = note: `#[deny(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/ch08/pig_latin.rs:14:33
[INFO] [stdout]    |
[INFO] [stdout] 14 |             let mut chars = word.clone().chars();
[INFO] [stdout]    |                                 ^^^^^^^^ unnecessary method call
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `the-rust-book-exercises` (bin "the-rust-book-exercises") due to 3 previous errors; 21 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> src/ch17/state_pattern.rs:47:27
[INFO] [stdout]    |
[INFO] [stdout] 47 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `reject` is never used
[INFO] [stdout]   --> src/ch17/encoding_type.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 47 | impl ReviewedPost {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 52 |     pub fn reject(self) -> PendingReviewPost {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]  --> src/ch08/pig_latin.rs:9:41
[INFO] [stdout]   |
[INFO] [stdout] 9 |             pig_latin_word.push_str(word.clone());
[INFO] [stdout]   |                                         ^^^^^^^^ unnecessary method call
[INFO] [stdout]   |
[INFO] [stdout]   = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout]   = note: `#[deny(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/ch08/pig_latin.rs:14:33
[INFO] [stdout]    |
[INFO] [stdout] 14 |             let mut chars = word.clone().chars();
[INFO] [stdout]    |                                 ^^^^^^^^ unnecessary method call
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `the-rust-book-exercises` (bin "the-rust-book-exercises" test) due to 3 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "382b51bf602acecc3e3705832bdae23afa78ad97b4849469b776508066ed0de0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "382b51bf602acecc3e3705832bdae23afa78ad97b4849469b776508066ed0de0", kill_on_drop: false }`
[INFO] [stdout] 382b51bf602acecc3e3705832bdae23afa78ad97b4849469b776508066ed0de0