[INFO] cloning repository https://github.com/jwfy/rust-learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jwfy/rust-learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjwfy%2Frust-learn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjwfy%2Frust-learn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fea3642a5516386a605fc34601a8a06e59deba7b
[INFO] checking jwfy/rust-learn against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjwfy%2Frust-learn" "/workspace/builds/worker-95/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-95/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jwfy/rust-learn on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jwfy/rust-learn
[INFO] finished tweaking git repo https://github.com/jwfy/rust-learn
[INFO] tweaked toml for git repo https://github.com/jwfy/rust-learn written to /workspace/builds/worker-95/source/Cargo.toml
[INFO] crate git repo https://github.com/jwfy/rust-learn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 87788c20006f338c953e6c0715fbd04142fe3d743be60700184eaef2cd2d1290
[INFO] running `Command { std: "docker" "start" "-a" "87788c20006f338c953e6c0715fbd04142fe3d743be60700184eaef2cd2d1290", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "87788c20006f338c953e6c0715fbd04142fe3d743be60700184eaef2cd2d1290", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87788c20006f338c953e6c0715fbd04142fe3d743be60700184eaef2cd2d1290", kill_on_drop: false }`
[INFO] [stdout] 87788c20006f338c953e6c0715fbd04142fe3d743be60700184eaef2cd2d1290
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 376c2c51b835b2d1b235cc862724758bf49cdac48413dc4fd818181d9a076dc1
[INFO] running `Command { std: "docker" "start" "-a" "376c2c51b835b2d1b235cc862724758bf49cdac48413dc4fd818181d9a076dc1", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking rust-learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Formatter`, `Pointer`
[INFO] [stdout]   --> src/basic/owner_ship.rs:45:20
[INFO] [stdout]    |
[INFO] [stdout] 45 |     use std::fmt::{Formatter, Pointer};
[INFO] [stdout]    |                    ^^^^^^^^^  ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/basic/type_system.rs:18:40
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn dynaimic_dispatch(point_trait: &PointTrait) -> i32 {
[INFO] [stdout]    |                                        ^^^^^^^^^^ help: use `dyn`: `dyn PointTrait`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/basic/type_system.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/basic/threads.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use std::io::Read;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::spawn`
[INFO] [stdout]  --> src/basic/threads.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::thread::spawn;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/basic/trait0.rs:128:26
[INFO] [stdout]     |
[INFO] [stdout] 128 |         let write1: &mut Write = &mut buf;
[INFO] [stdout]     |                          ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]   --> src/basic/owner_ship.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |         let b2 = a2;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/basic/owner_ship.rs:93:13
[INFO] [stdout]    |
[INFO] [stdout] 93 |         let p2 = p1;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/basic/type_system.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let p2 = p1;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/basic/type_system.rs:65:13
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let p1 = Point { x: 11, y: 22 };
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/basic/type_system.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |             let p2 = Point { x: 44, y: 33 };
[INFO] [stdout]    |                 ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/basic/type_system.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |         let p1 = Point { x: 1, y: 2 };
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/basic/type_system.rs:88:13
[INFO] [stdout]    |
[INFO] [stdout] 88 |         let p1 = Point { x: 3, y: 4 };
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `ss1` is never read
[INFO] [stdout]    --> src/basic/type_system.rs:208:17
[INFO] [stdout]     |
[INFO] [stdout] 208 |         let mut ss1 = ss;
[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] warning: unused variable: `iter`
[INFO] [stdout]   --> src/basic/iter.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |         let iter = v1.iter();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]   --> src/basic/iter.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |         let iter = &v1.iter();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> src/basic/threads.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let s1 = "hello world";
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `write1`
[INFO] [stdout]    --> src/basic/trait0.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |         let write1: &mut Write = &mut buf;
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_write1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/basic/type_system.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let mut p1 = Point { x: 11, y: 22 };
[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]    --> src/basic/type_system.rs:112:13
[INFO] [stdout]     |
[INFO] [stdout] 112 |         let mut second = Box::new(Node {
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Formatter`, `Pointer`
[INFO] [stdout]   --> src/basic/owner_ship.rs:45:20
[INFO] [stdout]    |
[INFO] [stdout] 45 |     use std::fmt::{Formatter, Pointer};
[INFO] [stdout]    |                    ^^^^^^^^^  ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/basic/type_system.rs:18:40
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn dynaimic_dispatch(point_trait: &PointTrait) -> i32 {
[INFO] [stdout]    |                                        ^^^^^^^^^^ help: use `dyn`: `dyn PointTrait`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/basic/type_system.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/basic/threads.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use std::io::Read;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::spawn`
[INFO] [stdout]  --> src/basic/threads.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::thread::spawn;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]  --> src/threadpool/threadpool.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     id : usize,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `thread`
[INFO] [stdout]  --> src/threadpool/threadpool.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     thread: JoinHandle<()>
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `workers`
[INFO] [stdout]   --> src/threadpool/threadpool.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     workers: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_1`
[INFO] [stdout]   --> src/basic/owner_ship.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |     pub fn test_1() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_2`
[INFO] [stdout]   --> src/basic/owner_ship.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn test_2() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_3`
[INFO] [stdout]   --> src/basic/owner_ship.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     pub fn test_3() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]   --> src/basic/owner_ship.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 98 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dynaimic_dispatch`
[INFO] [stdout]   --> src/basic/type_system.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn dynaimic_dispatch(point_trait: &PointTrait) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `static_dispatch`
[INFO] [stdout]   --> src/basic/type_system.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn static_dispatch<T>(t: &T) -> i32
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `static_dispatch_1`
[INFO] [stdout]   --> src/basic/type_system.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn static_dispatch_1<T: PointTrait>(t: T) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_1`
[INFO] [stdout]   --> src/basic/type_system.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn test_1() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_1`
[INFO] [stdout]   --> src/basic/type_system.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub fn test_1() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_2`
[INFO] [stdout]   --> src/basic/type_system.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn test_2() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_3`
[INFO] [stdout]   --> src/basic/type_system.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn test_3() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_4`
[INFO] [stdout]   --> src/basic/type_system.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     pub fn test_4() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_box`
[INFO] [stdout]    --> src/basic/type_system.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 100 |     fn test_box() {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `point`
[INFO] [stdout]    --> src/basic/type_system.rs:145:12
[INFO] [stdout]     |
[INFO] [stdout] 145 |     pub fn point() {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_trait`
[INFO] [stdout]    --> src/basic/type_system.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 174 | pub fn test_trait() {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_drop`
[INFO] [stdout]    --> src/basic/type_system.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 | pub fn test_drop() {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_box`
[INFO] [stdout]    --> src/basic/type_system.rs:185:8
[INFO] [stdout]     |
[INFO] [stdout] 185 | pub fn test_box() {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/basic/type_system.rs:189:8
[INFO] [stdout]     |
[INFO] [stdout] 189 | pub fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test1`
[INFO] [stdout]  --> src/basic/threads.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn test1() {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]   --> src/basic/threads.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_deref`
[INFO] [stdout]  --> src/basic/trait0.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 |     pub fn test_deref() {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_deref2`
[INFO] [stdout]   --> src/basic/trait0.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn test_deref2() {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_default`
[INFO] [stdout]   --> src/basic/trait0.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 57 |     pub fn test_default() {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]   --> src/basic/trait0.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_iter`
[INFO] [stdout]   --> src/list/second.rs:88:12
[INFO] [stdout]    |
[INFO] [stdout] 88 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/live_coding/file_io.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new(name: String, age: i32, genger: Genger) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement drops value
[INFO] [stdout]   --> src/basic/type_system.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |             p1;
[INFO] [stdout]    |             ^^^ help: use `drop` to clarify the intent: `drop(p1);`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/basic/type_system.rs:160:13
[INFO] [stdout]     |
[INFO] [stdout] 160 |             &pp;
[INFO] [stdout]     |             ^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 160 |             let _ = &pp;
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `Foo` should have an upper case name
[INFO] [stdout]  --> src/basic/threads.rs:9:20
[INFO] [stdout]   |
[INFO] [stdout] 9 |             static Foo : RefCell<u32> = RefCell::new(1)
[INFO] [stdout]   |                    ^^^ help: convert the identifier to upper case (notice the capitalization): `FOO`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `dynTrait` should have a snake case name
[INFO] [stdout]   --> src/basic/trait0.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | mod dynTrait {
[INFO] [stdout]    |     ^^^^^^^^ help: convert the identifier to snake case: `dyn_trait`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 53 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]   --> src/basic/owner_ship.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |         let b2 = a2;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/basic/owner_ship.rs:93:13
[INFO] [stdout]    |
[INFO] [stdout] 93 |         let p2 = p1;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/basic/type_system.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let p2 = p1;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/basic/type_system.rs:65:13
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let p1 = Point { x: 11, y: 22 };
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/basic/type_system.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |             let p2 = Point { x: 44, y: 33 };
[INFO] [stdout]    |                 ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/basic/type_system.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |         let p1 = Point { x: 1, y: 2 };
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/basic/type_system.rs:88:13
[INFO] [stdout]    |
[INFO] [stdout] 88 |         let p1 = Point { x: 3, y: 4 };
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/basic/type_system.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let mut p1 = Point { x: 11, y: 22 };
[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]    --> src/basic/type_system.rs:112:13
[INFO] [stdout]     |
[INFO] [stdout] 112 |         let mut second = Box::new(Node {
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]  --> src/threadpool/threadpool.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     id : usize,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `thread`
[INFO] [stdout]  --> src/threadpool/threadpool.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     thread: JoinHandle<()>
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `workers`
[INFO] [stdout]   --> src/threadpool/threadpool.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     workers: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_1`
[INFO] [stdout]   --> src/basic/owner_ship.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |     pub fn test_1() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_2`
[INFO] [stdout]   --> src/basic/owner_ship.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn test_2() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_3`
[INFO] [stdout]   --> src/basic/owner_ship.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     pub fn test_3() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]   --> src/basic/owner_ship.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 98 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dynaimic_dispatch`
[INFO] [stdout]   --> src/basic/type_system.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn dynaimic_dispatch(point_trait: &PointTrait) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `static_dispatch`
[INFO] [stdout]   --> src/basic/type_system.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn static_dispatch<T>(t: &T) -> i32
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `static_dispatch_1`
[INFO] [stdout]   --> src/basic/type_system.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn static_dispatch_1<T: PointTrait>(t: T) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_1`
[INFO] [stdout]   --> src/basic/type_system.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn test_1() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_1`
[INFO] [stdout]   --> src/basic/type_system.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub fn test_1() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_2`
[INFO] [stdout]   --> src/basic/type_system.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn test_2() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_3`
[INFO] [stdout]   --> src/basic/type_system.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn test_3() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_4`
[INFO] [stdout]   --> src/basic/type_system.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     pub fn test_4() {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_box`
[INFO] [stdout]    --> src/basic/type_system.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 100 |     fn test_box() {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `point`
[INFO] [stdout]    --> src/basic/type_system.rs:145:12
[INFO] [stdout]     |
[INFO] [stdout] 145 |     pub fn point() {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_trait`
[INFO] [stdout]    --> src/basic/type_system.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 174 | pub fn test_trait() {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_drop`
[INFO] [stdout]    --> src/basic/type_system.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 | pub fn test_drop() {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_box`
[INFO] [stdout]    --> src/basic/type_system.rs:185:8
[INFO] [stdout]     |
[INFO] [stdout] 185 | pub fn test_box() {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/basic/type_system.rs:189:8
[INFO] [stdout]     |
[INFO] [stdout] 189 | pub fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/basic/iter.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn new() -> Counter {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `piter`
[INFO] [stdout]   --> src/basic/iter.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn piter<U, T>(t : T)
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test1`
[INFO] [stdout]  --> src/basic/threads.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn test1() {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]   --> src/basic/threads.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_deref`
[INFO] [stdout]  --> src/basic/trait0.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 |     pub fn test_deref() {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_deref2`
[INFO] [stdout]   --> src/basic/trait0.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn test_deref2() {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_default`
[INFO] [stdout]   --> src/basic/trait0.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 57 |     pub fn test_default() {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]   --> src/basic/trait0.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `format`
[INFO] [stdout]    --> src/basic/trait0.rs:110:12
[INFO] [stdout]     |
[INFO] [stdout] 110 |     pub fn format(input: &String, formatter: Box<dyn Formatter>) -> bool {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `More`
[INFO] [stdout]   --> src/list/first.rs:39:3
[INFO] [stdout]    |
[INFO] [stdout] 39 |   More(Box<Node>),
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `elem`
[INFO] [stdout]   --> src/list/first.rs:43:3
[INFO] [stdout]    |
[INFO] [stdout] 43 |   elem: i32,
[INFO] [stdout]    |   ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/list/first.rs:48:10
[INFO] [stdout]    |
[INFO] [stdout] 48 |   pub fn new() -> Self {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/list/first.rs:53:10
[INFO] [stdout]    |
[INFO] [stdout] 53 |   pub fn push(&mut self, elem:i32) {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/list/first.rs:72:10
[INFO] [stdout]    |
[INFO] [stdout] 72 |   pub fn pop(&mut self) -> Option<i32> {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/list/second.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/list/second.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn push(&mut self, elem: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/list/second.rs:70:12
[INFO] [stdout]    |
[INFO] [stdout] 70 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_mut`
[INFO] [stdout]   --> src/list/second.rs:81:12
[INFO] [stdout]    |
[INFO] [stdout] 81 |     pub fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_iter`
[INFO] [stdout]   --> src/list/second.rs:88:12
[INFO] [stdout]    |
[INFO] [stdout] 88 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/live_coding/file_io.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new(name: String, age: i32, genger: Genger) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `load`
[INFO] [stdout]   --> src/live_coding/file_io.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn load(file_name: &str) -> Result<Self, std::io::Error> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `store`
[INFO] [stdout]   --> src/live_coding/file_io.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn store(&self, file_name: &str) -> Result<usize, std::io::Error> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `strtok`
[INFO] [stdout]  --> src/live_coding/strtok.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn strtok<'a>(s: &'a mut &str, p: char) -> &'a str {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/live_coding/fibonacci.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub fn new(total: u8) -> Self {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Event`
[INFO] [stdout]  --> src/live_coding/encoder.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Event<Id, Data> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/live_coding/encoder.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn new(id: Id, data: Data) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `encode`
[INFO] [stdout]   --> src/live_coding/encoder.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn encode(&self) -> Option<Vec<u8>> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement drops value
[INFO] [stdout]   --> src/basic/type_system.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |             p1;
[INFO] [stdout]    |             ^^^ help: use `drop` to clarify the intent: `drop(p1);`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/basic/type_system.rs:160:13
[INFO] [stdout]     |
[INFO] [stdout] 160 |             &pp;
[INFO] [stdout]     |             ^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 160 |             let _ = &pp;
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `Foo` should have an upper case name
[INFO] [stdout]  --> src/basic/threads.rs:9:20
[INFO] [stdout]   |
[INFO] [stdout] 9 |             static Foo : RefCell<u32> = RefCell::new(1)
[INFO] [stdout]   |                    ^^^ help: convert the identifier to upper case (notice the capitalization): `FOO`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `dynTrait` should have a snake case name
[INFO] [stdout]   --> src/basic/trait0.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 | mod dynTrait {
[INFO] [stdout]    |     ^^^^^^^^ help: convert the identifier to snake case: `dyn_trait`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 66 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.76s
[INFO] running `Command { std: "docker" "inspect" "376c2c51b835b2d1b235cc862724758bf49cdac48413dc4fd818181d9a076dc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "376c2c51b835b2d1b235cc862724758bf49cdac48413dc4fd818181d9a076dc1", kill_on_drop: false }`
[INFO] [stdout] 376c2c51b835b2d1b235cc862724758bf49cdac48413dc4fd818181d9a076dc1