[INFO] cloning repository https://github.com/BruceChar/LearnRustByExample
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[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBruceChar%2FLearnRustByExample'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2150219561f9dd455dbbc74483301654dc899e9f
[INFO] checking BruceChar/LearnRustByExample against master#f2c70877a7dbc51cd98e2d5d25209b24d4a586d5 for pr-150097
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[INFO] validating manifest of git repo https://github.com/BruceChar/LearnRustByExample on toolchain f2c70877a7dbc51cd98e2d5d25209b24d4a586d5
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[INFO] crate git repo https://github.com/BruceChar/LearnRustByExample 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" "+f2c70877a7dbc51cd98e2d5d25209b24d4a586d5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded getrandom v0.1.15
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+f2c70877a7dbc51cd98e2d5d25209b24d4a586d5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] [stdout] bc7ecab9f9a335c81c8d8805c5b2876db1ca25088caf5d84c37595a65bbbb7cb
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[INFO] [stdout] 70df0f1d38f9d1092fa732db2509dd632ab479d452cfa23a04c45fe376e2b24d
[INFO] running `Command { std: "docker" "start" "-a" "70df0f1d38f9d1092fa732db2509dd632ab479d452cfa23a04c45fe376e2b24d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]     Checking another v0.1.0 (/opt/rustwide/workdir/src/another)
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking anolib v0.1.0 (/opt/rustwide/workdir/anolib)
[INFO] [stderr]     Checking mylib v0.1.0 (/opt/rustwide/workdir/mylib)
[INFO] [stderr]     Checking RustByExamples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> examples/demo.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut m = 9;
[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] error[E0277]: cannot add a float to an integer
[INFO] [stdout]   --> examples/recursive_type.rs:35:31
[INFO] [stdout]    |
[INFO] [stdout] 35 |     println!("{:?} {:?}", e, c+d);
[INFO] [stdout]    |                               ^ no implementation for `{integer} + {float}`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `Add<{float}>` is not implemented for `{integer}`
[INFO] [stdout]    = help: the following other types implement trait `Add<Rhs>`:
[INFO] [stdout]              `&f128` implements `Add<f128>`
[INFO] [stdout]              `&f128` implements `Add`
[INFO] [stdout]              `&f16` implements `Add<f16>`
[INFO] [stdout]              `&f16` implements `Add`
[INFO] [stdout]              `&f32` implements `Add<f32>`
[INFO] [stdout]              `&f32` implements `Add`
[INFO] [stdout]              `&f64` implements `Add<f64>`
[INFO] [stdout]              `&f64` implements `Add`
[INFO] [stdout]            and 56 others
[INFO] [stdout] note: required for `Cup<{integer}>` to implement `Add<Cup<{float}>>`
[INFO] [stdout]   --> examples/recursive_type.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl <A,B> Add<Cup<B>> for Cup<A>
[INFO] [stdout]    |            ^^^^^^^^^^^     ^^^^^^
[INFO] [stdout] 20 | where A: Add<B>
[INFO] [stdout]    |          ------ unsatisfied trait bound introduced here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]  --> examples/demo.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let iter = [1,2,3].iter();
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `m1` is never read
[INFO] [stdout]  --> examples/demo.rs:3:18
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut m1 = m;
[INFO] [stdout]   |                  ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> examples/file.rs:27:7
[INFO] [stdout]    |
[INFO] [stdout] 27 |   let f = File::open("hello.txt").unwrap_or_else(|err| {
[INFO] [stdout]    |       ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `RustByExamples` (example "recursive_type") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused import: `std::io::stdin`
[INFO] [stdout]  --> examples/struct.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io::stdin;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unit` is never constructed
[INFO] [stdout]  --> examples/struct.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Unit;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `age` are never read
[INFO] [stdout]   --> examples/struct.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Person<'a> {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 12 |   name: &'a str,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 13 |   age: u8
[INFO] [stdout]    |   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `p` and `sex` are never read
[INFO] [stdout]   --> examples/struct.rs:18:3
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct Man<'a> {
[INFO] [stdout]    |        --- fields in this struct
[INFO] [stdout] 18 |   p: Person<'a>,
[INFO] [stdout]    |   ^
[INFO] [stdout] 19 |   sex: &'a str
[INFO] [stdout]    |   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Man` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> examples/thread.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `wid` is not used by name
[INFO] [stdout]   --> examples/format.rs:26:71
[INFO] [stdout]    |
[INFO] [stdout] 26 |   println!("宽度：\n{1:*^9}\n{0:#<wid$}\n{:d>2$.3e}\n", 3.4567, 1.23456, wid=5);
[INFO] [stdout]    |                                              --                          ^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]    |                                              |
[INFO] [stdout]    |                                              this formatting argument uses named argument `wid` by position
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(named_arguments_used_positionally)]` on by default
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 26 -   println!("宽度：\n{1:*^9}\n{0:#<wid$}\n{:d>2$.3e}\n", 3.4567, 1.23456, wid=5);
[INFO] [stdout] 26 +   println!("宽度：\n{1:*^9}\n{0:#<wid$}\n{:d>wid$.3e}\n", 3.4567, 1.23456, wid=5);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]  --> examples/generic.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Display;
[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: `Lines as iLines`
[INFO] [stdout]  --> examples/generic.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{Lines as iLines, BufReader, BufRead};
[INFO] [stdout]   |               ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str::Lines`
[INFO] [stdout]  --> examples/generic.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::str::Lines;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lines`
[INFO] [stdout]   --> examples/generic.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let lines = "some\nniubi\nstring".lines();
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_lines`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main1` is never used
[INFO] [stdout]  --> examples/thread.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn main1() {
[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 import: `super::*`
[INFO] [stdout]   --> src/main.rs:21:7
[INFO] [stdout]    |
[INFO] [stdout] 21 |   use super::*;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]   --> src/main.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | mod tests{
[INFO] [stdout]    | ^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `next` in this scope
[INFO] [stdout]   --> examples/box.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |     next: &'a Node<'a>,
[INFO] [stdout]    |     ---- a field by that name exists in `Self`
[INFO] [stdout] ...
[INFO] [stdout] 48 |             next
[INFO] [stdout]    |             ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print` is never used
[INFO] [stdout]  --> src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn print(a: i32) -> 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: field `0` is never read
[INFO] [stdout]   --> examples/format.rs:57:15
[INFO] [stdout]    |
[INFO] [stdout] 57 |   struct Deep(Structure);
[INFO] [stdout]    |          ---- ^^^^^^^^^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `Deep` 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] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `age` are never read
[INFO] [stdout]   --> examples/format.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |   struct Person<'a> {
[INFO] [stdout]    |          ------ fields in this struct
[INFO] [stdout] 61 |     name: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 62 |     age: u8
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Receiver` and `Sender`
[INFO] [stdout]  --> examples/channel.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     Sender,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 4 |     Receiver
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `io`
[INFO] [stdout]   --> examples/channel.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     io::spawn();
[INFO] [stdout]    |     ^^ use of unresolved module or unlinked crate `io`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `io`, use `cargo add io` to add it to your `Cargo.toml`
[INFO] [stdout] help: a builtin type with a similar name exists
[INFO] [stdout]    |
[INFO] [stdout] 13 -     io::spawn();
[INFO] [stdout] 13 +     i8::spawn();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `putline`
[INFO] [stdout]   --> examples/box.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let putline = || print!("\n");
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_putline`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> examples/box.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let n = Node::new();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/inter_mutability.rs:18:45
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let b = Cons(RefCell::new(4), Rc::clone(&a));
[INFO] [stdout]    |                                   --------- ^^ expected `&Rc<List>`, found `&List`
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   arguments to this function are incorrect
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&Rc<List>`
[INFO] [stdout]               found reference `&List`
[INFO] [stdout] note: method defined here
[INFO] [stdout]   --> library/core/src/clone.rs:236:7
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/inter_mutability.rs:19:45
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let c = Cons(RefCell::new(3), Rc::clone(&a));
[INFO] [stdout]    |                                   --------- ^^ expected `&Rc<List>`, found `&List`
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   arguments to this function are incorrect
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&Rc<List>`
[INFO] [stdout]               found reference `&List`
[INFO] [stdout] note: method defined here
[INFO] [stdout]   --> library/core/src/clone.rs:236:7
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0615]: attempted to take value of method `borrow_mut` on type `RefCell<i32>`
[INFO] [stdout]   --> examples/inter_mutability.rs:24:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |             *v.borrow_mut += 5;
[INFO] [stdout]    |                ^^^^^^^^^^ method, not a field
[INFO] [stdout]    |
[INFO] [stdout]    = help: methods are immutable and cannot be assigned to
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `RustByExamples` (example "box") due to 1 previous error; 2 warnings emitted
[INFO] [stdout] Some errors have detailed explanations: E0308, E0615.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `RustByExamples` (example "channel") due to 1 previous error; 1 warning emitted
[INFO] [stderr] error: could not compile `RustByExamples` (example "inter_mutability") due to 3 previous errors
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> examples/iterator.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |     let mut names = vec!["Bruce", "Chal", "Grooy"];
[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: variable does not need to be mutable
[INFO] [stdout]    --> examples/iterator.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |     let mut names = ["Bruce", "Chal", "Grooy"];
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> examples/iterator.rs:179:9
[INFO] [stdout]     |
[INFO] [stdout] 179 |     let mut fib = Fibonacci::new();
[INFO] [stdout]     |         ----^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> examples/iterator.rs:186:9
[INFO] [stdout]     |
[INFO] [stdout] 186 |     let mut fib = Fibonacci::new();
[INFO] [stdout]     |         ----^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `names`
[INFO] [stdout]    --> examples/iterator.rs:164:9
[INFO] [stdout]     |
[INFO] [stdout] 164 |     let names = ["Bruce", "WTF"];
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_names`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> examples/iterator.rs:200:9
[INFO] [stdout]     |
[INFO] [stdout] 200 |     let mut word = Words::new("Hello Bruce I am WTFUCKER");
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_type` is never used
[INFO] [stdout]   --> examples/iterator.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn print_type<T>(_: &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: struct `Fibonacci` is never constructed
[INFO] [stdout]   --> examples/iterator.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Fibonacci {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> examples/iterator.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl Fibonacci {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 37 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `iter` is never used
[INFO] [stdout]    --> examples/iterator.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | impl<'a> Words<'a> {
[INFO] [stdout]     | ------------------ method in this implementation
[INFO] [stdout] 126 |     fn iter(&'a self) -> IterHelper<'a> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `exam_run` is never used
[INFO] [stdout]    --> examples/iterator.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn exam_run() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "70df0f1d38f9d1092fa732db2509dd632ab479d452cfa23a04c45fe376e2b24d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70df0f1d38f9d1092fa732db2509dd632ab479d452cfa23a04c45fe376e2b24d", kill_on_drop: false }`
[INFO] [stdout] 70df0f1d38f9d1092fa732db2509dd632ab479d452cfa23a04c45fe376e2b24d
