[INFO] cloning repository https://github.com/BruceChar/LearnRustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BruceChar/LearnRustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBruceChar%2FLearnRustByExample", kill_on_drop: false }`
[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#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBruceChar%2FLearnRustByExample" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BruceChar/LearnRustByExample on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BruceChar/LearnRustByExample
[INFO] finished tweaking git repo https://github.com/BruceChar/LearnRustByExample
[INFO] tweaked toml for git repo https://github.com/BruceChar/LearnRustByExample written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/BruceChar/LearnRustByExample already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "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" "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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b15ae301ac3c37fbf274ba7ddd9853e46844cbb137968c92b91eb0952ffb2ff
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2b15ae301ac3c37fbf274ba7ddd9853e46844cbb137968c92b91eb0952ffb2ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b15ae301ac3c37fbf274ba7ddd9853e46844cbb137968c92b91eb0952ffb2ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b15ae301ac3c37fbf274ba7ddd9853e46844cbb137968c92b91eb0952ffb2ff", kill_on_drop: false }`
[INFO] [stdout] 2b15ae301ac3c37fbf274ba7ddd9853e46844cbb137968c92b91eb0952ffb2ff
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 95fda4f78d11dece3c9408383062f8749fe71fe1e06ddd52b0ba35848c132ae7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "95fda4f78d11dece3c9408383062f8749fe71fe1e06ddd52b0ba35848c132ae7", kill_on_drop: false }`
[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: unused imports: `BorrowMut`, `Borrow`
[INFO] [stdout]   --> examples/smart_point.rs:24:19
[INFO] [stdout]    |
[INFO] [stdout] 24 | use std::borrow::{BorrowMut, Borrow};
[INFO] [stdout]    |                   ^^^^^^^^^  ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `DerefMut`, `Deref`
[INFO] [stdout]   --> examples/smart_point.rs:25:16
[INFO] [stdout]    |
[INFO] [stdout] 25 | use std::ops::{Deref, DerefMut};
[INFO] [stdout]    |                ^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RefMut`
[INFO] [stdout]   --> examples/smart_point.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 | use std::cell::{RefMut, RefCell};
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]   --> examples/mod.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn function() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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)]` 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 import: `DerefMut`
[INFO] [stdout]  --> examples/trait.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ops::{Deref, DerefMut};
[INFO] [stdout]   |                       ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::alloc::handle_alloc_error`
[INFO] [stdout]  --> examples/trait.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::alloc::handle_alloc_error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> examples/func.rs:9:27
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn factory(x: i32) -> Box<Fn(i32) -> i32> {
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(i32) -> i32`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `eat_granny_smith`
[INFO] [stdout]   --> examples/struct_inherit.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |         pub fn eat_granny_smith(&mut self) { self.granny_smiths += 1; }
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> examples/struct_inherit.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     name: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `age`
[INFO] [stdout]   --> examples/struct_inherit.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     age: u16,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `subject`
[INFO] [stdout]   --> examples/struct_inherit.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     subject: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]  --> examples/loop.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         'inner: loop {
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[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] 48 |             next
[INFO] [stdout]    |             ^^^^ a field by this name exists in `Self`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> examples/from_into.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |             Err(e) => Person::default()
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `o`
[INFO] [stdout]    --> examples/trait.rs:160:9
[INFO] [stdout]     |
[INFO] [stdout] 160 |     let o = Some(3);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_o`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> examples/trait.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `demo_ref`
[INFO] [stdout]   --> examples/trait.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn demo_ref<T>(t:&T) where T:Debug {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `show_type`
[INFO] [stdout]   --> examples/trait.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn show_type<T:Debug>(_v: &T) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RustByExamples` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_by_examples`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed for `HashMap<K, V>`
[INFO] [stdout]   --> examples/rc.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let m = HashMap::new();
[INFO] [stdout]    |         -   ^^^^^^^^^^^^ cannot infer type for type parameter `K`
[INFO] [stdout]    |         |
[INFO] [stdout]    |         consider giving `m` the explicit type `HashMap<K, V>`, where the type parameter `K` is specified
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `RustByExamples`
[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] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]  --> examples/loop.rs:4:25
[INFO] [stdout]   |
[INFO] [stdout] 4 |     v.iter().map(|x| x).collect();
[INFO] [stdout]   |                         ^^^^^^^ cannot infer type for type parameter `B` declared on the associated function `collect`
[INFO] [stdout]   |
[INFO] [stdout]   = note: cannot satisfy `_: FromIterator<&i32>`
[INFO] [stdout] help: consider specifying the type argument in the method call
[INFO] [stdout]   |
[INFO] [stdout] 4 |     v.iter().map(|x| x).collect::<B>();
[INFO] [stdout]   |                                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0283`.
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `io`
[INFO] [stdout]   --> examples/channel.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     io::spawn();
[INFO] [stdout]    |     ^^ use of undeclared crate or module `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Receiver`, `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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[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]    = note: `#[warn(unused_imports)]` 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]    = note: required because of the requirements on the impl of `Add<Cup<{float}>>` for `Cup<{integer}>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/smart_point.rs:30:26
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let a = Rc::new(Cons(Rc::new(RefCell::new(1)),
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^ expected `i32`, found struct `Rc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected type `i32`
[INFO] [stdout]             found struct `Rc<RefCell<{integer}>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print`
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RustByExamples` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_by_examples`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]  --> examples/match.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 4 |   Alabama,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]  --> examples/match.rs:5:3
[INFO] [stdout]   |
[INFO] [stdout] 5 |   Alaska,
[INFO] [stdout]   |   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penney`
[INFO] [stdout]   --> examples/match.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 |   Penney,
[INFO] [stdout]    |   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> examples/match.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout] 12 |   Nickel,
[INFO] [stdout]    |   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> examples/match.rs:13:3
[INFO] [stdout]    |
[INFO] [stdout] 13 |   Dime,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quarter`
[INFO] [stdout]   --> examples/match.rs:14:3
[INFO] [stdout]    |
[INFO] [stdout] 14 |   Quarter(UsState),
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> examples/match.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `other_bind`
[INFO] [stdout]   --> examples/match.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn other_bind(coin: Coin) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]   --> examples/match.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `count_without_quarter`
[INFO] [stdout]   --> examples/match.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn count_without_quarter(coins: &Vec<Coin>) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `count_while`
[INFO] [stdout]   --> examples/match.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn count_while(coins: &mut Vec<Coin>) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/smart_point.rs:31:26
[INFO] [stdout]    |
[INFO] [stdout] 31 |                          Rc::new(Nil)));
[INFO] [stdout]    |                          ^^^^^^^^^^^^ expected struct `RefCell`, found struct `Rc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `RefCell<Rc<_>>`
[INFO] [stdout]               found struct `Rc<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `m1` is never read
[INFO] [stdout]  --> examples/demo.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut m1 = m;
[INFO] [stdout]   |             ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[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 struct `Rc`, found enum `List`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&Rc<List>`
[INFO] [stdout]               found reference `&List`
[INFO] [stdout] 
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/smart_point.rs:32:22
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut b = Cons(Rc::new(RefCell::new(2)), Rc::clone(&a));
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^ expected `i32`, found struct `Rc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected type `i32`
[INFO] [stdout]             found struct `Rc<RefCell<{integer}>>`
[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 struct `Rc`, found enum `List`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&Rc<List>`
[INFO] [stdout]               found reference `&List`
[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] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[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] [stdout] warning: 3 warnings emitted
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/smart_point.rs:32:48
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut b = Cons(Rc::new(RefCell::new(2)), Rc::clone(&a));
[INFO] [stdout]    |                                                ^^^^^^^^^^^^^ expected struct `RefCell`, found struct `Rc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `RefCell<Rc<_>>`
[INFO] [stdout]               found struct `Rc<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[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)]` 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: 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 is never used: `print_type`
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> examples/iterator.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> examples/iterator.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 126 |     fn iter(&'a self) -> IterHelper<'a> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `exam_run`
[INFO] [stdout]    --> examples/iterator.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn exam_run() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/smart_point.rs:34:19
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let  c = Cons(Rc::new(RefCell::new(3)), a.clone()); // 只增加引用计数
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^ expected `i32`, found struct `Rc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected type `i32`
[INFO] [stdout]             found struct `Rc<RefCell<{integer}>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> examples/smart_point.rs:34:45
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let  c = Cons(Rc::new(RefCell::new(3)), a.clone()); // 只增加引用计数
[INFO] [stdout]    |                                             ^^^^^^^^^ expected struct `RefCell`, found struct `Rc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `RefCell<Rc<_>>`
[INFO] [stdout]               found struct `Rc<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "95fda4f78d11dece3c9408383062f8749fe71fe1e06ddd52b0ba35848c132ae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95fda4f78d11dece3c9408383062f8749fe71fe1e06ddd52b0ba35848c132ae7", kill_on_drop: false }`
[INFO] [stdout] 95fda4f78d11dece3c9408383062f8749fe71fe1e06ddd52b0ba35848c132ae7