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[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/YoruAi/RustStudy" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYoruAi%2FRustStudy", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3520973f0097d52a13779d1137493ca9e422d5c0
[INFO] checking YoruAi/RustStudy against try#e622d8d7bed4f2668d446e06c6c1436ecae15796 for pr-156776
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYoruAi%2FRustStudy" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-4-tc2/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/YoruAi/RustStudy
[INFO] finished tweaking git repo https://github.com/YoruAi/RustStudy
[INFO] tweaked toml for git repo https://github.com/YoruAi/RustStudy written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/YoruAi/RustStudy on toolchain e622d8d7bed4f2668d446e06c6c1436ecae15796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/YoruAi/RustStudy 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" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stdout] 719fd587ad703619f61d3d44efbe10306d489825303ad60e0de5ae72c5725fa4
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[INFO] [stderr]     Checking chapter11-tests v0.1.0 (/opt/rustwide/workdir/chapter11-tests)
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[INFO] [stderr]     Checking num_cpus v1.17.0
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[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]   --> chapter11-tests/src/bin/tests.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn add(a: u32, b: u32) -> u32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter13-functional-features v0.1.0 (/opt/rustwide/workdir/chapter13-functional-features)
[INFO] [stdout] warning: unused variable: `closure`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/closures.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let closure = |num: u32| -> u32 { num };
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closure`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/closures.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let s = closure(String::from("hello"));
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> chapter13-functional-features/src/bin/iterator.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut v1 = vec![1, 2, 3];
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1_iter`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/iterator.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let v1_iter = v1.iter(); // &
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_v1_iter`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1_iter`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/iterator.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let v1_iter = v1.iter_mut(); // &mut
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_v1_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]   --> chapter13-functional-features/src/bin/iterator.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let count = v1.iter().count();
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `collect`
[INFO] [stdout]   --> chapter13-functional-features/src/bin/iterator.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let collect: Vec<i32> = v1.iter().copied().collect();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_collect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter10-generic-traits-lifetimes v0.1.0 (/opt/rustwide/workdir/chapter10-generic-traits-lifetimes)
[INFO] [stderr]     Checking chapter15-smart-pointer v0.1.0 (/opt/rustwide/workdir/chapter15-smart-pointer)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> chapter13-functional-features/src/bin/iterator.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut v1 = vec![1, 2, 3];
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1_iter`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/iterator.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let v1_iter = v1.iter(); // &
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_v1_iter`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1_iter`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/iterator.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let v1_iter = v1.iter_mut(); // &mut
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_v1_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]   --> chapter13-functional-features/src/bin/iterator.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let count = v1.iter().count();
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `collect`
[INFO] [stdout]   --> chapter13-functional-features/src/bin/iterator.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let collect: Vec<i32> = v1.iter().copied().collect();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_collect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> chapter10-generic-traits-lifetimes/src/bin/traits.rs:49:24
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn some_function<T, U>(t: &T, u: &U) -> impl Display
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> chapter10-generic-traits-lifetimes/src/bin/traits.rs:49:31
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn some_function<T, U>(t: &T, u: &U) -> impl Display
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> chapter10-generic-traits-lifetimes/src/bin/traits.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn some_function<T, U>(t: &T, u: &U) -> impl Display
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter18-object-oriented v0.1.0 (/opt/rustwide/workdir/chapter18-object-oriented)
[INFO] [stdout] warning: unused variable: `closure`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/closures.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let closure = |num: u32| -> u32 { num };
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closure`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> chapter13-functional-features/src/bin/closures.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let s = closure(String::from("hello"));
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter01-helloworld v0.1.0 (/opt/rustwide/workdir/chapter01-helloworld)
[INFO] [stderr]     Checking chapter16-concurrency v0.1.0 (/opt/rustwide/workdir/chapter16-concurrency)
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/ptr_rc.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/ptr_rc.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter14-cargo v0.1.0 (/opt/rustwide/workdir/chapter14-cargo)
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> chapter18-object-oriented/src/bin/oop_features.rs:64:27
[INFO] [stdout]    |
[INFO] [stdout] 64 |     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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter04-ownership v0.1.0 (/opt/rustwide/workdir/chapter04-ownership)
[INFO] [stderr]     Checking chapter08-collections v0.1.0 (/opt/rustwide/workdir/chapter08-collections)
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> chapter18-object-oriented/src/bin/oop_features.rs:64:27
[INFO] [stdout]    |
[INFO] [stdout] 64 |     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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter07-crates-and-modules v0.1.0 (/opt/rustwide/workdir/chapter07-crates-and-modules)
[INFO] [stderr]     Checking chapter19-patterns-and-matching v0.1.0 (/opt/rustwide/workdir/chapter19-patterns-and-matching)
[INFO] [stderr]     Checking chapter09-error v0.1.0 (/opt/rustwide/workdir/chapter09-error)
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/ptr_rc.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/ptr_rc.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/ptr_rc.rs:10:14
[INFO] [stdout]    |
[INFO] [stdout] 10 |         Cons(i32, Rc<List>),
[INFO] [stdout]    |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 10 -         Cons(i32, Rc<List>),
[INFO] [stdout] 10 +         Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> chapter08-collections/src/bin/vector.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut v: Vec<i32> = Vec::new(); // omitted type if compiler can infer
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> chapter08-collections/src/bin/vector.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut v: Vec<i32> = Vec::new(); // omitted type if compiler can infer
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 |     if let Some(i) = x {
[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 variable: `third`
[INFO] [stdout]  --> chapter08-collections/src/bin/vector.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let third = v.get(2); // will return None if out of bounds
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_third`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:13:14
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let Some(i) = x else {
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:17:20
[INFO] [stdout]    |
[INFO] [stdout] 17 |     while let Some(i) = x {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 |     for (index, value) in v.iter().enumerate() {}
[INFO] [stdout]    |          ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |     for (index, value) in v.iter().enumerate() {}
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let (x, y) = (1, 2);
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let (x, y) = (1, 2);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:25:22
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn coordinates(&(x, y): &(i32, i32)) {}
[INFO] [stdout]    |                      ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> chapter19-patterns-and-matching/src/bin/patterns_places.rs:25:25
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn coordinates(&(x, y): &(i32, i32)) {}
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> chapter08-collections/src/bin/vector.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let row = vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapter08-collections/src/bin/vector.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         Int(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 21 -         Int(i32),
[INFO] [stdout] 21 +         Int(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapter08-collections/src/bin/vector.rs:22:15
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Float(f64),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 22 -         Float(f64),
[INFO] [stdout] 22 +         Float(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapter08-collections/src/bin/vector.rs:23:14
[INFO] [stdout]    |
[INFO] [stdout] 23 |         Text(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 23 -         Text(String),
[INFO] [stdout] 23 +         Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/ptr_box.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let list = List::Cons(1, Box::new(List::Cons(2, Box::new(List::Nil))));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter03-common-concepts v0.1.0 (/opt/rustwide/workdir/chapter03-common-concepts)
[INFO] [stderr]     Checking appendix v0.1.0 (/opt/rustwide/workdir/appendix)
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/deref.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn hello(name: &str) {}
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> chapter15-smart-pointer/src/bin/drop.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let c = CustomSmartPointer {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string3`
[INFO] [stdout]   --> chapter10-generic-traits-lifetimes/src/bin/lifetime.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let string3 = String::from("'b");
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string3`
[INFO] [stdout]   --> chapter10-generic-traits-lifetimes/src/bin/lifetime.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let string3 = String::from("'a");
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce` is never used
[INFO] [stdout]   --> chapter10-generic-traits-lifetimes/src/bin/lifetime.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 38 |     fn announce<'b>(&self, announcement: &'b str) -> &'b str {
[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: `home`
[INFO] [stdout]   --> chapter09-error/src/bin/panic.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let home: IpAddr = "127.0.0.1"
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[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::ops::Deref`
[INFO] [stdout]  --> chapter15-smart-pointer/src/bin/ptr_ref_cell.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `syn` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/e622d8d7bed4f2668d446e06c6c1436ecae15796/bin/rustc --crate-name syn --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.117/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="extra-traits"' --cfg 'feature="fold"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="visit"' --cfg 'feature="visit-mut"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("clone-impls", "default", "derive", "extra-traits", "fold", "full", "parsing", "printing", "proc-macro", "test", "visit", "visit-mut"))' -C metadata=ceb78e5bef6e4cb3 -C extra-filename=-7c7437438a104b4b --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-d4cb564e807a9cd7.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-28532d321a976b97.rmeta --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-8c98a1a0e58216a9.rmeta --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `zerocopy` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/e622d8d7bed4f2668d446e06c6c1436ecae15796/bin/rustc --crate-name zerocopy --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/zerocopy-0.8.39/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="simd"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("__internal_use_only_features_that_work_on_stable", "alloc", "derive", "float-nightly", "simd", "simd-nightly", "std", "zerocopy-derive"))' -C metadata=4ad22931f5275d9b -C extra-filename=-46d85773dc52aabd --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints allow --cap-lints=forbid --check-cfg 'cfg(no_zerocopy_simd_x86_avx12_1_89_0)' --check-cfg 'cfg(rust, values("1.89.0"))' --check-cfg 'cfg(no_zerocopy_core_error_1_81_0)' --check-cfg 'cfg(rust, values("1.81.0"))' --check-cfg 'cfg(no_zerocopy_diagnostic_on_unimplemented_1_78_0)' --check-cfg 'cfg(rust, values("1.78.0"))' --check-cfg 'cfg(no_zerocopy_generic_bounds_in_const_fn_1_61_0)' --check-cfg 'cfg(rust, values("1.61.0"))' --check-cfg 'cfg(no_zerocopy_target_has_atomics_1_60_0)' --check-cfg 'cfg(rust, values("1.60.0"))' --check-cfg 'cfg(no_zerocopy_aarch64_simd_1_59_0)' --check-cfg 'cfg(rust, values("1.59.0"))' --check-cfg 'cfg(no_zerocopy_panic_in_const_and_vec_try_reserve_1_57_0)' --check-cfg 'cfg(rust, values("1.57.0"))' --check-cfg 'cfg(doc_cfg)' --check-cfg 'cfg(kani)' --check-cfg 'cfg(__ZEROCOPY_INTERNAL_USE_ONLY_NIGHTLY_FEATURES_IN_TESTS)' --check-cfg 'cfg(__ZEROCOPY_INTERNAL_USE_ONLY_DEV_MODE)' --check-cfg 'cfg(coverage_nightly)'` (signal: 9, SIGKILL: kill)
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapter15-smart-pointer/src/bin/ptr_ref_cell.rs:24:28
[INFO] [stdout]    |
[INFO] [stdout] 24 |         Cons(RefCell<i32>, Rc<List>),
[INFO] [stdout]    |         ----               ^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 24 -         Cons(RefCell<i32>, Rc<List>),
[INFO] [stdout] 24 +         Cons(RefCell<i32>, ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "719fd587ad703619f61d3d44efbe10306d489825303ad60e0de5ae72c5725fa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "719fd587ad703619f61d3d44efbe10306d489825303ad60e0de5ae72c5725fa4", kill_on_drop: false }`
[INFO] [stdout] 719fd587ad703619f61d3d44efbe10306d489825303ad60e0de5ae72c5725fa4
